Second in a series of reports to investigate the subsurface soil conditions at accelerograph stations which have been categorized by other researchers as 'rock' sites. Contained in this volume are our findings of the site conditions at 29 accelerograph st...
National Technical Information Service (NTIS)
Contents: Characteristics of SMAC-type Strong-Motion Earthquake Accelerographs; List of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1994; Hypocenters of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1994; List o...
This 270 page report contains tables for SMAC-type strong-motion earthquake accelerograph characteristics, list of earthquakes recorded by these strong-motion accelerographs in 1993, hypocenters of earthquakes recorded by these accelerographs in 1993, and...
Contents: Characteristics of SMAC-type Strong-Motion Earthquake Accelerographs; List of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1992; Hypocenters of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1992; List o...
Contents: Characteristics of SMAC-Type Strong-Motion Earthquake Accelerographs; List of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1991; Hypocenters of Earthquakes Recorded by any of the Strong-Motion Accelerographs in 1991; List o...
CONTENTS: Characteristics of SMAC-type strong-motion earthquake accelerographs; List of earthquakes recorded by any of the strong-motion accelerographs in 1988; Hypocenters of earthquakes recorded by any of the strong-motion accelerographs in 1988; List o...
Contents: Characteristics of strong-motion earthquake accelerographs; List of earthquakes recorded by any of the strong-motion accelerographs in 1987; Hypocenters of earthquakes recorded by any of the strong-motion accelerographs in 1987; List of the site...
Contents: Characteristics of strong-motion earthquake accelerographs; List of earthquakes recorded by any of the strong-motion accelerographs in 1985; Hypocenters of earthquakes recorded by any of the strong-motion accelerographs in 1985; List of the site...
Contents: Characteristics of strong-motion earthquake accelerographs; List of earthquakes recorded by any of the strong-motion accelerographs in 1984; Hypocenters of earthquakes recorded by any of the strong-motion accelerographs in 1984; List of the site...
Contents: Characteristics of strong-motion earthquake accelerographs; List of earthquakes recorded by any of the strong-motion accelerographs in 1983; Hypocenters of earthquakes recorded by any of the strong-motion accelerographs in 1983; List of the site...
accelerometers, accelerographs, ada... Gravimeters (2) Parameter Definition gravimeters, inclinometers... Link to NASA website ...
NASA Website
This report is the third in a series presenting geotechnical information for accelerograph stations in California that have been classified as 'rock' sites by one or more investigators. This volume discusses the findings at five locations which are in the...
Appendix to the second in a series of reports to investigate the subsurface soil conditions at accelerograph stations which have been categorized by other researchers as 'rock' sites in California. Appendix to Volume 2 contains the accelerograms which hav...
Studies were conducted at nineteen accelerograph station sites in southern California which have been categorized by other researchers as 'rock' sites. Each site was visited and available geotechnical data were compiled in an effort to verify the subsurfa...
Contents: Strong-motion accelerograph records; A statistical summary of accelerograph performance during the earthquake of February 9, 1971; Seismoscope results - San Fernando Earthquake of February 9, 1971; Preliminary report on Felt Area and intensity; ...
The paper presents results of a study of some of the characteristics of the Kinemetrics PDR-1 digital strong-motion accelerograph. The paper gives the results of laboratory tests of the background noise level of the instrument and compares these results w...
This list contains information on the strong-motion accelerographs maintained by the U.S. Geological Survey in a national network of strong-motion instrumentation maintained in cooperation with other Federal, state, and local agencies and organizations. S...
After having examined the necessity of installing in Italy a network of 9strong motion accelerographs, a study was carried out to evaluate the probability of picking up by means of this network an event of intensity 6 or more. In addition, the number of a...
This report summarizes geotechnical data that was obtained in the investigation of 83 accelerograph stations located in the United States. These stations were studied during the period from 1975 to 1979 and the detailed findings are contained in nine data...
The National Geophysical Data Center (NGDC) and its collocated World Data Center-A for Solid Earth Geophysics (WDC-A) are responsible for acquiring, archiving, and disseminating strong-motion accelerograph data to meet requirements of the scientific and t...
for �TREMOR: A Wireless, MEMS Accelerograph for Dense Arrays� (Evans et al., 2003) By John R. Evans, Robert H. Hamstra, Jr., Paul Spudich, Christoph Kündig, Patrick Camina,...
Science.gov Websites
This is the third in a series of reports to investigate the subsurface soil conditions at selected accelerograph stations. Contained in this volume are the findings of site conditions at six accelerograph stations in the western U.S. These stations are lo...
... Theme_Keyword: ACCELEROGRAPHS; Theme_Keyword: ACOUSTIC RADAR; Theme_Keyword: NPOL > NASA PORTABLE S-BAND MULTIPARAMETER WEATHER RESEARCH RADAR ...
ACCELEROGRAPHS � Ancillary Description � ACOUSTIC RADAR � Ancillary Description NPOL > NASA Portable S-band Multiparameter Weather Research Radar ...
accelerometers, accelerographs, ada, egg... Seismometers (137) Parameter Definition seismometers, seismographs... Gravimeters (177) Parameter Definition ...
The data itself comes from two different sources; 20 digitally recording accelerographs operated by Lamont and NCEER and over 50 magnetic tapes that were ...
A magnitude 4.7 (BRK) earthquake on 4 September 1972 in the area of the NOAA Stone Canyon Geophysical Observatory produced a strong-motion accelerograph recording of 0.7 g acceleration, the second highest known recorded acceleration. The report gives data...
Seismic and geotechnical data for four accelerograph stations located in the southern and central part of California are presented. These stations are located at Pasadena, Santa Barbara, Taft, and Hollister.
Energy Citations Database
This is the fifth in a series of reports presenting geotechnical and seismic data for selected accelerograph stations. This volume discusses the findings at five stations, one each in the following locations: Fairbanks, Alaska; Petrolia, California; Holli...
This is the fourth in a series of reports presenting geotechnical and seismic data for selected accelerograph stations. This volume discusses the findings at five stations, one each in the cities of Anchorage, Alaska; Seattle, Washington; Olympia, Washing...
Seismic and geotechnical data for four accelerograph stations located in the southern and central part of California are presented. These stations are located at: CIT Millikan Library, Santa Barbara Court House, Taft and Melendy Ranch Barn, Hollister. Inc...
Seismic and geotechnical data for 11 accelerograph stations located in three parts of Los Angeles are presented. Four stations each are situated near Wilshire Boulevard and Century City, while the three remaining stations are located on Venture Boulevard....
This list contains information on strong-motion stations installed in the Western Hemisphere for which there is some data in the files of the U.S. Geological Survey. It is intended to provide an indication of the status of the networks as of March 1977. T...
This study consists of an assessment of a six-step procedure that comprises site-dependent and site-independent methods for developing seismic input criteria at sites of nuclear plants and other major structures. The assessment was based on an application...
This report provides strong-motion data users with information recovered by the Seismic Engineering Branch of the U.S. Geological Survey. It contains a summary of all accelerographs recovered from the National Strong-Motion Network during the period of Ju...
This report summarizes geotechnical data that was obtained in the investigation of 83 accelerograph stations located in the United States. These stations were studied during the period from 1975 to 1979 and the detailed findings are contained in nine data reports. Summary logs indicating subsurface soil conditions and material properties have been prepared for each of the ...
A network of strong-motion accelerographs has been installed at the Lawrence Livermore National Laboratory as part of the LLNL Site Seismic Safety Program. The network has two objectives: (1) to provide quantitative information on the severity of ground s...
Two schemes are proposed for constructing trajectory measurement systems on the basis of six-pendulum accelerographs which make possible separate determination of translational and rotational movement of the soil, excluding the influence of the transverse...
A network of strong-motion accelerographs has been deployed at the Lawrence Livermore National Laboratory (LLNL) as part of the Site Seismic Safety Program. The network has three objectives: (1) the measurement of free-field ground motion for analyses of the ground shaking and its variation at the site, (2) measurement of the motion in certain buildings for detailed analyses ...
A network of strong-motion accelerographs has been deployed at the Lawrence Livermore National Laboratory (LLNL) as part of the Site Seismic Safety Program. The network has three objectives: (1) the measurement of free-field ground motion for analyses of ...
The catalog lists all strong-motion accelerographs which are part of the National Strong-Motion Instrumentation Network managed by Seismic Engineering, USGS, for the National Science Foundation. The National Strong-Motion Instrumentation Network consists ...
The 2003 San Simeon, California, earthquake (M 6.5) generated a set of high-rate (1-sample-per-second) Global Positioning System (GPS) positions and ground motions from digital accelerographs in the Parkfield region (at epicentral distances of 50 to 70 km). The waveforms of displacements derived from the 13 GPS receivers in the region have dominant periods between about 7 and ...
NASA Astrophysics Data System (ADS)
An inexpensive method using natural earthquake data is utilized for determining the sedimentary thickness in Kachchh. The Institute of Seismological Research (ISR) is operating a network of broadband seismographs and strong motion accelerographs in Gujarat. We used data from 13 broadband seismographs and two strong motion accelerographs in the study. The ...
The Idaho National Engineering and Environmental Laboratory (INEEL) operates 26 seismic stations remotely located in southeastern Idaho and 25 strong-motion accelerographs located at critical facilities at the INEEL Site. The INEEL seismic network has upgraded standard analog instrumentation at all of its seismic station to digital recording systems. Seismic data are ...
The installation of a strong-motion network in Turkey was initiated in 1973 under the sponsorship of the Earthquake Research Institute. Today, 61 accelerographs and 40 seismoscope stations have been installed along the most active seismic zones, namely the North Anatolian zone and in the graben systems of western Anatolia. All the strong ground motion records, which were ...
The network of strong motion accelerographs in Mexico includes instruments that were installed, under an international cooperative research program, in sites selected for the high potenial of a large earthquake. The 19 September 1985 earthquake (magnitude 8.1) occurred in a seismic gap where an earthquake was expected. As a result, there is an excellent descripton of the ...
PubMed
The Idaho National Engineering Laboratory (INEL) is located approximately 80 km southeast of the epicenter for the 1983 M{sub S} 7.3 Borah Peak Idaho earthquake. Thirteen strong-motion accelerographs located at various facilities around the INEL Site recorded strong-ground motions from the Borah Peak earthquake. The strong-motion records were digitized and processed resulting ...
The Idaho National Engineering Laboratory (INEL) is located approximately 80 km southeast of the epicenter for the 1983 M(sub S) 7.3 Borah Peak Idaho earthquake. Thirteen strong-motion accelerographs located at various facilities around the INEL Site reco...
The 1983 Borah Peak, Idaho Earthquake was the largest normal faulting event to occur in the last 20 years. There were no near-field recordings of ground motion during the main shock, however, thirteen accelerographs in a permanent array at the Idaho National Engineering Laboratory (INEL) recorded the event at epicentral distances of 90 to 110 km. Peak horizontal accelerations ...
The network of strong motion accelerographs in Mexico includes instruments that were installed, under an international cooperative research program, in sites selected for the high potential of a large earthquake. The 19 September 1985 earthquake (magnitude 8.1) occurred in a seismic gap where an earthquake was expected. As a result, there is an excellent description of the ...
The 1983 Borah Peak, Idaho Earthquake was the largest normal faulting event to occur in the last 20 years. There were no near-field recordings of ground motion during the main shock, however, thirteen accelerographs in a permanent array at the Idaho Natio...
, local magnitudes, and coda-duration magnitudes for earthquakes in central California, Bull. seism. Soc on quantification of the earthquake source, Seism. Res. Lett., 72, 151�152. Ben-Zion, Y. & Lyakhovsky, V., 2001-frequency ground motions based on seismological models of the radiated spectra, Bull. seism. Soc. Am., 73, 1865
E-print Network
The El Centro Terminal Substation Building, where many strong motion records have been measured, is underlain by a massive foundation block and rests on deep deposits of soft soil materials. These conditions suggest important soil/structure interaction ef...
This study seeks accurate near-surface shear-wave velocity data at several sites in the Los Angeles area. These data currently are being used to correlate both seismic velocity and strong-motion indices with local near-suface site conditions. Included is ...
This set of accelerograms is for the famous Kobe earthquake of Jan. 17, 1995 as recorded by the accelerographs located throughout Japan. The earthquake occurred at 05:46 Japan Standard Time with its epicentral region being Awajishima at the depth of 14.4 ...
The set of accelerograms is for the Far Off Sanriku earthquake, and for the Off Iwate Prefecture earthquake as recorded by the accelerographs located throughout Japan. The Sanriku earthquake occurred at 21:19 of Feb. 1994 (Japan Standard Time) with its ep...
This report presents tables for accelerograph sites, and the accelerograms recorded for August 31, 1991 earthquake of near Kunashiri Island (estimated magnitude 6.5) and October 4, 1994 earthquake of Eastern Offshore of Hokkaido (estimated magnitude of 8....
Seismic and geotechnical data for seismograph stations located in Ferndale, Cholame (No. 2), and El Centro, California, are presented. At Ferndale, the investigations indicate that there is a surficial layer of silty clay with shear velocity (Vs) of about...
A 4.2 magnitude earthquake occurred on 1/1/76 (09:20 PST) in the Puente Hills of eastern Los Angeles County at a depth of approximately 8 km. Eleven strong motion accelerograph records were obtained from instruments located within a 14 km radius of the ep...
Seismic and geotechnical data for 11 accelerograph stations located in three parts of Los Angeles are presented. Four stations each are situated near Wilshire Boulevard and Century City, while the three remaining stations are located on Ventura Boulevard. Near the Wilshire Boulevard stations, a 400-foot deep boring reveals that this region is underlain by about 30 feet of ...
This volume presents strong motion data from three earthquakes in the New Madrid Seismic Zone. One accelerograph was triggered by the mb= 4.2 June 13, 1975 event, seven were triggered by an mb= 5.0 event on March 25, 1976, and one was triggered by an mb= ...
Data concerning ground motion and the response of structures during strong earthquakes are necessary for seismic hazard evaluation and the definition of design criteria for structures to be constructed in seismically active zones. The only way to obtain such data is the installation of a strong-motion instrument network. The Yugoslav strong-motion programme was created in 1972 to recover ...
In May 1978, an international workshop-conference on the design of dense, strong-motion arrays was held at Honolulu. Hawaii with participants from Czechoslovakia, India, Iran, Italy, Japan, Mexico. New Zealand, Spain, Turkey, and the United States. The purpose of this workshop was to bring together experts from around the world to develop concepts for the design of earthquake motion recording ...
We describe the anaesthetic management of a 72-year-old man with myasthenic syndrome. Pre-operatively, he was treated with 3,4-diaminopyridine and showed a strong hand grip. During general anaesthesia with nitrous oxide and sevoflurane in oxygen, a mechanomyograph and two accelerographs were set up for the hands and left foot to monitor neuromuscular function. Insufficient ...
To understand the cause of observed amplification of seismic waves even at hill-zone sites in the Valley of Mexico, digital accelerographs have been installed at three especially chosen sites. Two of these sites, Madin (MADI) and a place near Netzahualcoyotlis bath (TEXC) located on hard Pleistocene lava (a few meters in thickness) overlying Oligocene andesites, were expected ...
A network of strong-motion accelerographs has been installed at the Lawrence Livermore National Laboratory as part of the LLNL Site Seismic Safety Program. The network has two objectives: (1) to provide quantitative information on the severity of ground shaking for the assessment of structural effects at LLNL following an earthquake, and (2) to provide data for analyses of the ...
A network of strong-motion accelerograph was installed at the Lawrence Livermore National Laboratory (LLNL) as part of site seismic safety program. The network has two objectives: to provide quantitative information on the severity of ground shaking for the assessment of structural effects at LLNL following an earthquake, and to provide data for analyses of the free-field ...
In recent years a network of 30 accelerographs has been installed through the zones of highest seismic activity of Spain. For the first time, digital strong motion records have been obtained in Spain, with a maximum horizontal acceleration value of 0.06 g. A comprehensive study is made of the strong motion recordings of an earthquake which occurred in southwest Spain, on ...
Moment tensor inversion for the focal mechanism of the 12 earthquakes of the Dongfang (Hainan) earthquake swarm occurred from June to August 1992 with near-source broadband data recorded by a temporal small-aperture network consisting of DCS-302 digital three-component accelerographs. The results inverted indicate that the predominant components of sources of all these 12 ...
An active source seismic experiment is scheduled for the end of October in the central United States' New Madrid Seismic Zone (NMSZ). Researchers from the center for Earthquake Research and Information (CERI) of the University of Memphis and the U.S. Geological Survey are planning 2600-lb and 5000-lb explosions at the southern and northern ends of the NMSZ, respectively. Broadband seismic ...
Strong motion data from three earthquakes is presented. One accelerograph was triggered by the mb = 4.2 June 13, 1975 event, seven were triggered by an mb = 5.0 event on March 25, 1976, and one was triggered by an mb = 4.5 aftershock on March 25, 1976. The strong motion data were processed using the computer programs developed at CALTECH. The raw digitized accelerograms, as ...
Fifty years after the first installation of analog accelerographs, digital instruments recording the strong-motion came in operation. Their advantages comparing to the analog ones are obvious and they have been described in detail in several works. Nevertheless it has been pointed out that velocity and displacement values derived from several accelerograms, recorded in ...
In order to determine the fundamental period of soil vibrations in Cairo, 174 microtremors stations, in conjunction with mobile accelerographs, were used. The result was a collection of long-period microtremors and ambient noise arising from cultural disturbances. The Nile Valley shows some fixed peaks at 2.5-3.5 Hz at the center of the basin, while the Nile�s surrounding ...
The main features of strong-motion data processing procedures used in China are as follows: the effect of the record length on the level of digitizing noise background is considered; a different method is suggested for digitizing and connecting the successive sections of those long duration records requiring repositioning on the digitizer table; the method for instrument correction at both high ...
The report presents the progress to date in establishing the facts about dynamic subsurface properties and geological features in the area affected by the San Fernando earthquake of February 9, 1971. Special emphasis is given to the locations of accelerographs, seismoscopes and Seismological Field Survey aftershock instruments. Thirty shallow geophysical surveys were made for ...
Push-over analysis is a simple and applied approach which can be used for estimation of demand responses influenced by earthquake stimulations. The analysis is non-linear static analysis of the structure affected under increasing lateral loads and specifying the displacement--load diagram or structure capacity curve, draw the curve the base shear values and lateral deflection on the roof level of ...
Push-over analysis is a simple and applied approach which can be used for estimation of demand responses influenced by earthquake stimulations. The analysis is non-linear static analysis of the structure affected under increasing lateral loads and specifying the displacement-load diagram or structure capacity curve, draw the curve the base shear values and lateral deflection on the roof level of ...
This report provides strong-motion users with information recovered by the Seismic Engineering Branch of the U.S. Geological Survey. The document contains recent accelerograph records, preliminary reports on the southern California earthquake of January 1, 1976, and the Guatemala earthquake of February 4, 1976. Several abstracts and information on the availability of digitized ...
Analytical results are presented for Rayleigh waves excited by a sudden change in the rate of growth of a subsurface zone of rupture. The curved rupture front advances across an inclined plane. The rupture can be brittle or cohesive tractions can act at its front. The analysis consists of two parts: First, ray theory is used to calculate wavefront approximations to the waves emitted when the ...
Every conventional respiration monitoring technique requires at least one sensor to be attached to the body of the subject during measurement, thereby imposing a sense of restraint that results in aversion against measurements that would last over consecutive days. To solve this problem, we developed a respiration monitoring system for sleepers, and it uses a fiber-grating vision sensor, which is ...
The Idaho National Laboratory (INL) has accumulated 37 years of earthquake data (1972-2009). This report covers the earthquake activity from January 1, 2009 through December 31, 2009 and is a continuation of previous annual reports on earthquake activity surrounding the eastern Snake River Plain (ESRP) and within and near the INL. It discusses the earthquake activity that has occurred around the ...
During 2004, INL analyzed more than 2,300 earthquakes. There were 487 earthquakes with magnitudes up to 4.0 located within the 161-km (100-mile) radius of the Idaho National Laboratory (INL). Seventeen small to moderate earthquakes of magnitudes from 3.0 to 5.0 occurred with the region outside the 161-km radius. Earthquakes activity occurred in areas that have experienced seismic activity in the ...
Two schemes are proposed for constructing trajectory measurement systems on the basis of six-pendulum accelerographs which make possible separate determination of translational and rotational movement of the soil, excluding the influence of the transverse component of oscillations. These methods are similar to those developed for inertial navigation. It would be possible to ...
A method based on a point source representation and non-linear least square formulation, which estimates the strike, dip and rake of the causative fault, has been used to infer the causative fault plane parameters using strong ground motion data for the some recent earthquakes in Iran. This study indicates that the analysis of SH-Waves of near field accelerographs can ...
An array of instruments designed to provide uniquely useful data on earthquakes and their effects in the San Francisco Bay area has been completed. Developed by geophysicists in the Seismological Field Survey (of the Boulder, Colorado-based Earth Sciences Laboratories, one of NOAA's Environmental Research Laboratories), the new array is among the most comprehensive strong-motion recording systems ...
Most instruments used in seismological practice to record ground motion are pendulum seismographs, velocigraphs or accelerographs. In most cases it is assumed that seismic instruments are only sensitive to the translational motion of the instrument's base. In this study the full equation of pendulum motion including the inputs of rotations and tilts is considered. It is shown ...
A method for rapid retrieval of earthquake-source parameters from long-period surface waves is developed. With this method, the fault geometry and seismic moment can be determined immediately after the surface wave records have been retrieved. Hence, it may be utilized for warning of tsunamis in real time. The surface wave spectra are inverted to produce either a seismic moment tensor (linear) or ...
An inversion method for fast retrieval of earthquake source parameters developed earlier has been applied to 28 large (MS >= 6.5), shallow earthquakes which occurred in 1980. Rayleigh waves recorded by the IDA (International Deployment of Accelerographs) network were used for the analysis. For very shallow events, the inversion is ill-conditioned and two of the ...
During the last two decades strong motion arrays have been installed in the various parts of Himalaya including N-E India through the Department of Science &Technology. Several moderate earthquakes have been recorded by these networks, which have brought out interesting results about the pattern of attenuation of ground acceleration in these regions. The networks are being strengthened further ...
Since 1973, the General Directorate of Disaster Affairs of Turkey has deployed several strong-motion accelerographs at selected sites. Within the framework of the project entitled Compilation of National Strong Ground Motion Database in Accordance with International Standards, site conditions were investigated within the upper 30-m depth by surface seismic and standard ...
- Four days after the December 13, 1990 Hualien, Taiwan earthquake (ML= 6.9), a temporary array of fifteen triaxial digital accelerographs was deployed in the epicenter area to monitor aftershocks. Approximately 600 earthquakes triggered this array during the three-month deployment period. The Yan-Liau station (S63) alone recorded 162 events. Most of the accelerograms at S63 ...
S-wave spectral analysis is applied to 174 strong motion accelerationrecords to obtain the source parameters of 27 aftershocks(3.1 ML 4.3) of the May 13, 1995, Mw 6.6,Kozani-Grevena (NW Greece) earthquake. The data are derived from atemporary network, of three-component digital accelerographs, deployedwithin the strongly affected area some days after the mainshock ...
In the last 21 years the Lamont-Doherty Observatory has studied and monitored seismicity in the northeastern US for the purpose of understanding tectonic processes responsible for seismogenesis in this intraplate area. Central to this effort has been a seismic network covering most of New York State, northern New Jersey, and northern and central Vermont. Temporary networks of portable stations ...
On November 6, 1988, two earthquakes with magnitude >7 occurred within 15 minutes in southwestern Yunnan Province, China, near the Burmese border. The aftershock series in the next six weeks included three earthquakes with magnitude >6.0. Rapid deployment of accelerographs enabled us to record a large number of aftershocks, including two Ms >6 events, at near-source ...
The inversion procedure of Andrews (1986) is applied to separate the source and path effects, and site response from ground motion spectra from sixteen moderate earthquakes observed for direct S-waves by a dense array of 150 accelerographs in the city of Yokohama, Japan. We constrain the source effect to the ? 2 model consideringthe focal mechanisms of the earthquakes. The ...
In 1991, the Central Weather Bureau (CWB) undertook the Taiwan Strong Motion Instrumentation Program (TSMIP) deploying 680 digital accelerographs in free-field sites. Because a station spacing of a few kilometers has been achieved (except in the unpopulated high mountain areas). Thus, A large amount and high-quality digital accelerograms were collected from numerous ...
This study involved investigations at Imperial Valley, California accelerograph stations, and was done because of the unique strong-motion data set recorded during the magnitude 6.5 earthquake of October 15, 1979. The project included the following investigations: (1) electronic cone-penetrometer soundings at nine stations; (2) drilling, sampling, and logging of 22 borings to ...
The Calaveras fault lies within a low velocity zone (LVZ) 1-2 km wide near Gilroy, California. Accelerographs G06, located in the LVZ 1.2 km from the Calaveras fault, and G07, 4 km from G06, recorded both the M 6.2 1984 Morgan Hill and the M 6.9 1989 Loma Prieta earthquakes. Comparison of the ground motions shows that a large 0.6-1.0 Hz velocity pulse observed at G06 during ...
The central computer system located in the Data Processing Laboratory of the John A. Blume Earthquake Engineering Center can perform the following functions: (1) Digitization of strong motion accelerograms obtained either from earthquakes or from tests of buildings can be performed. The accelerographs are traced on the digitizing table, which automatically records X and Y ...
The catalog contains information on all strong motion stations operating in Eastern North America known to the National Center for Earthquake Engineering Research (NCEER). The location, coordinates, installation dates, type of instrument, operator, structure type and size, and site geology are listed for each station. The format of the catalog is patterned after the United States Geological Survey ...
Recent technical developments in seismic instrumentation have made the recording of ground motion possible with higher fidelity-extending both the frequency band and dynamic range-and with progressively smaller space and time gaps. This is achieved by dense networks, continuous recording and real-time data acquisition. The trend is towards the emplacement of networks of multi-sensor stations ...
Site response at Mexico City has been intensively studied for the last 15 years, since the disastrous 1985 earthquakes. After those events, more than 100 accelerographs were installed, and their data have been extremely useful in quantifying amplification and in the subsequent upgrading of the building code. However, detailed analysis of the wavefield has been hampered by the ...
The seismic strong motion array project (SSMAP) for the Nicoya Peninsula in northwestern Costa Rica is composed of 10 - 13 sites including Geotech A900/A800 accelerographs (three-component), Ref-Teks (three- component velocity), and Kinemetric Episensors. The main objectives of the array are to: 1) record and locate strong subduction zone mainshocks [and foreshocks, "early ...
The seismic strong motion array project (SSMAP) for the Nicoya Peninsula in northwestern Costa Rica is composed of 10 13 sites including Geotech A900/A800 accelerographs (three-component), Ref-Teks (three- component velocity), and Kinemetric Episensors. The main objectives of the array are to: 1) record and locate strong subduction zone mainshocks [and foreshocks, "early ...
A long sequence of earthquakes causing few casualties and considerable damage in a wide zone struck Central Italy starting on September 26, 1997. Theearthquakes are characterized by normal faulting mechanism, with a NE-SW(anti-Apenninic direction) tension axis. In this paper we analyze the accelerometric recordings collected by the accelerograph stations belonging to the ...
The 28 September 2004 Parkfield, California, earthquake (Mw 6.0) and four aftershocks (Mw 4.7-5.1) were recorded on 12 accelerograph stations of the U.S. Geological Survey Parkfield seismic array (UPSAR), an array of three-component accelerographs occupying an area of about 1 km2 located 8.8 km from the San Andreas fault. Peak horizontal acceleration and ...
USGS Publications Warehouse
The September 28, 2004, Parkfield, California, earthquake (Mw 6.0) and four aftershocks (Mw 4.7 - 5.1) were recorded on 12 accelerograph stations of the UPSAR seismic array, an array of three-component accelerographs occupying an area of about 1 square km located 8.8 km from the San Andreas fault. Peak horizontal acceleration and velocity at UPSAR during ...
Significantly amplified ground accelerations at the Tarzana Hill station were recorded during the 1987 Mw 5.9 Whittier Narrows, the 1994 Mw 6.7 Northridge and the 1999 Mw 7.1 Hector Mine earthquakes. Peak horizontal ground acceleration at the Tarzana station during the Northridge earthquake reached 1.93 g and is considered to be one of the largest ever recorded acceleration. Explanations of the ...
The Aegean region which comprises the Hellenic arc and the adjacent areas of the Greek mainland, the Aegean Sea and western Turkey, is one of the most seismically active zones of the world and the most active in western Eurasia due to the convergence between the African and Eurasian lithospheric plates. The seismic activity especially in the southern Aegean area is very intense and extends up to a ...
Delineation of the top sedimentary structure and its Qs vs. Qp relationship using the travel-time difference of direct S and converted Sp phase is key to understanding the seismic hazard of any sedimentary basin area. We constructed filtered displacement waveforms from local ETNA Episensor acceleration recordings as well as local velocity recordings of aftershocks of the 2001 Bhuj earthquake ...
Significantly amplified ground accelerations at the Tarzana Hill station were recorded during the 1987 Mw 5.9 Whittier Narrows and the 1994 Mw 6.7 Northridge earthquakes. Peak horizontal ground acceleration at the Tarzana station during the 1999 Mw 7.1 Hector Mine earthquake was almost twice as large as the accelerations recorded at nearby stations. The Tarzana site was drilled to a depth of 100 ...
A dense network of strong motion seismometers is being developed in order to investigate the complexities of the upper crustal rupture process and propagation of major seismogenic sources such as the Alpine Fault and strands of the Marlborough Fault System defining the South Island sector of the Australia-Pacific plate boundary zone. The proposed network is designed as a dense array of ...
Jamaica is located near the northern boundary of the Caribbean Plate and is within a seismically active zone. Historic records of earthquakes date back to the sixteenth century during the early period of European settlement and colonization. During the last four centuries more than 4000 lives have been lost as a result of local seismic events and there are at least 55 documented cases in which ...
In the last decade strong-motion data in Taiwan have been increased tremendously. The recordings from the main shock and aftershocks of the 1999 Chi-Chi earthquake enrich the database that they offer novel opportunities to explore the variability of ground motions in Taiwan. More recently shear velocities for a portion of the strong-motion accelerographs deployed island-wide ...
The Venezuelan coastline mainly coincides with the plate tectonic boundary between the Caribbean and South American plate. The relative movement is accomodated in numerous west - east trending sub-parallel faults. The Venezuelan Andes are dominated by the broad southwest-northeast trending Bocono fault system. This plate tectonic setting causes a wide range of seismic activity in Venezuela. Among ...
A large Mw 7.7 earthquake took place in the Northern Chile subduction zone severely affecting the cities of Tocopilla, Maria Elena, Quillagua and Mejillones . The earthquake was very well recorded by many broadband stations at teleseismic distances and by more than 10 three-component accelerographs in the near field, four of them right above the rupture region. These data ...
The Royal Observatory of Belgium (ROB) is responsible for the seismic activity monitoring in Belgium. For this purpose the ROB operates a network of 24 seismic stations. In addition 18 accelerographs have been installed since 2001 in the most seismic active zones. Seismometers allow detecting and localizing any earthquake of magnitude larger than 1.0 in Belgium and ...
We study source characteristics of two small, local earthquakes which occurred in Delhi on 28 April 2001 (Mw3.4) and 18 March 2004 (Mw2.6). Both earthquakes were located in the heart of New Delhi, and were recorded in the epicentral region by digital accelerographs. The depths of the events are 15 km and 8 km, respectively. First motions and waveform modeling yield a ...
This report presents: (1) historic seismicity maps of the Shumagin seismic gap vicinity which show the relatively low level of seismic activity in the gap, a possible offset in the Benioff zone, and a few events associated with the Bering shelf continental margin south of the Pribilof Islands; (2) a seismicity map and hypocenter cross-sections based on data from the local Shumagin Islands seismic ...
The city of Cali is located in the western margin of the Cauca Valley in the flat area between the Western and Central cordilleras of the Colombian Andes, at 70 km east of the Eastern Pacific Subduction Zone. Even though present seismic activity associated with nearest faults is low, historical records demonstrate that earthquakes have caused damage in the city going up to intensity VIII (EMS). ...
Most instruments used in seismological practice to record ground motion in all directions use three sensors oriented toward North, East and upward. In this standard configuration horizontal and vertical sensors differ in their construction because of gravity acceleration always applied to a vertical sensor. An alternative way of symmetric sensor configuration was first introduced by Galperin ...
Real-time prediction of ground motion parameters, such as peak values, seismic intensity or spectral response, at a critical site or facility as well as on regional scale, can help to reduce losses by strong earthquakes by the automatic triggering of protective steps seconds prior to the arrival of high amplitude seismic waves. We present a concept for an earthquake early warning system designed ...
The source characterization and slip history of two moderate earthquakes recently occurred in the Southern Marmara Region NW Turkey, were investigated. These two moderate size earthquakes with magnitude Mw=4.8 and Mw=4.7, occurred at the Gulf of Gemlik and the North of Manyas Lake, indicate a new seismic activity associated with the Southern Strand of the North Anatolian Fault Zone (NAFZ). This ...
In this paper, the site characteristics of the Dahan downhole array are studied by analyzing the September 21, 1999 M 7.3 Chi-Chi earthquake sequence including the main shock and some aftershocks. The four-level array (0 m, 50 m, 100 m and 200 m) is located to the north of Hualien City in eastern Taiwan. Polarization analysis is used to check the orientation errors of the seismometers at different ...
Observation of aftershocks of the 2003 Tokachi-Oki earthquake was conducted in the southern part of the Tokachi basin in Hokkaido, Japan for estimation of local site effects. We installed accelerographs at 12 sites in Chokubetsu, Toyokoro, and Taiki areas, where large strong motion records were obtained during the main shock at stations of the K-NET and KiK-net. The stations ...
Based on the three component accelerograms, recorded at near-field distance by a temporary seismic network consisting of digital cassette tape recording accelerographs, the focal mechanisms of three aftershocks of the April 18, 1985, Luquan, Yunnan Province, China, earthquake of M S=6.1, are calculated using seismic moment tensor inversion technique. The phases of direct P, S ...
The Environmental Agency of the Republic of Slovenia, the Seismology Office is responsible for the fast and reliable information about earthquakes, originating in the area of Slovenia and nearby. In the year 2000 the project Modernization of the Slovenian National Seismic Network started. The purpose of a modernized seismic network is to enable fast and accurate automatic location of earthquakes, ...
Based on the experience of the 1999 Chi-Chi Earthquake, the Central Weather Bureau (CWB) has made substantial improvements to the earthquake rapid report system. Besides the current use of digital lease phone line and internet transmission, the satellite link for station to center is setup for backup. The station is also equipped with UPS to prevent the failure of electricity power. This backup ...
Two moderate size (mb=5.8, 6.0) earthquakes occurred within a local network of short-period seismograph stations in the Shumagin Islands, Alaska, on April 6, 1974. The network recorded about 70 aftershocks over the next 2 weeks. Both main shocks triggered a strong motion accelerograph (SMA) at Sand Point, 50 km NNW of their epicenters. High-quality relative locations obtained ...
The Nuclear Regulatory Commission has funded the first stage of development of a database of central and eastern US (CEUS) broadband and accelerograph records, along the lines of the existing Next Generation Attenuation (NGA) database for active tectonic areas. This database will form the foundation of an NGA East project for the development of CEUS ground-motion prediction ...
In this thesis, three recent earthquake datasets are analyzed in which local recording-site geology strongly modifies near-source ground motion in the 1-30 Hz band. Site effects in this frequency band complicate seismic-source observations, such as estimation of earthquake source parameters and high-frequency discrimination between earthquakes and explosions, and seismic-hazard predictions for ...
During 2005, the Idaho National Laboratory (INL) recorded 2390 independent triggers from earthquakes both within the region and from around the world. 38 small to moderate size earthquakes ranging in magnitude from 3.0 to 5.7 occurred within and outside the 161-km (100-mile) radius of INL. Earthquakes activity occurred in areas that have experienced seismic activity in the past, the Basin and ...
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This study reflects in some details on the following aspects related to the region: geological and tectonic setting, seismicity, swarms activity data base and seismic hazard assessment. Moreover, it documents the following aspects of the November 22, 1995 earthquake: tectonic, seismological, instrumental seismic data, strong motion recordings and response spectral and local site effect analysis, ...
The 9 October 1995 Colima-Jalisco subduction earthquake (Ms 7.4, Mw 8.0) occurred in the Middle American Trench, about 35 km southwest of Manzanillo, Mexico, producing considerable damage for buildings located near the epicentral area. Notable damage was also reported in the city of Guadalajara with an epicentral distance of about 240 km due to local site effects (Chavez, 1998). Here, ...
Aftershock observations of the 2004 Mid Niigata Prefecture earthquake were conducted in the central part of Ojiya city, the Niigata prefecture, central Japan, to investigate local site effects. We installed eight accelerographs in the vicinity of the K-NET and JMA stations in the area. The stations of the aftershock observations are situated under different geological ...
The source process of two large earthquakes that occurred in the Santa Cruz Islands subduction zone has been studied, one with a surface wave magnitude MS = 7.9 in 1966 and the other with MS = 7.7 in 1980. The seismic moment of the 1980 event estimated from long-period surface waves of Global Digital Seismograph Network (GDSN) and International Deployment of Accelerographs ...
The Natural Resources Building (NRB) in Olympia was shaken by three earthquakes (Mw=5.8, 6.8, and 5.0) between 1999 and 2001. Building motions were recorded on digital accelerographs, which comprise one of the best dense digital recordings to date of repeated strong shaking an a building. N-S motions dominate the fundamental mode of vibration of the building. In the 1999 ...
A seismic network has been operated in the Shumagin Islands and adjacent Alaska Peninsula, Alaska, since July 1973. Hypocentral cross sections based on the first 4 years of data from this network show a well-defined Benioff zone that is about 10 km thick and extends to about 180-km depth. Focal mechanism and strong-motion accelerograph data for an m/sub b/=6.0 earthquake at ...
The paper is intended to summarize the most important instrumental data of direct relevance for engineering activities, obtained in connection with the strong Vrancea earthquakes of 4 March 1977, 30 August 1986, 30 May 1990, and 31 May 1990, and to point out some significant consequences and conclusions derived on this basis. Two main objectives of this analysis may be emphasized: (a) in-depth ...
We have developed a methodology to assess accelerations expected to be exceeded on a given site for different return periods, taking site effects into account. The analysis is based on a seismotectonic zoning of France, that consists of areas of diffuse seismic- ity characterised by a frequency/magnitude distribution. In the south-eastern France, active faults can be included as potential sources ...
A temporary accelerometer network has been installed in Tarcento (Friuli, NE Italy), a small town heavily hit by the 1976-1977 Friuli earthquake sequence, as a part of an ongoing research project aimed at ground motion simulation and generation of shakemaps in the near-field of an earthquake. The network operated from October 2008 to April 2010 and consisted of three K2 ...
Three-dimensional attenuation structures are related to the subsurface heterogeneities present in the earth crust. An algorithm for estimation of three-dimensional attenuation structure in the part of Garhwal Himalaya, India has been presented by Joshi (Curr Sci 90:581-585, 2006b; Nat Hazards 43:129-146, 2007). In continuation of our earlier ...
The TERRAscope project of the California Institute of Technology began in 1988 and now has six very broadband seismic stations (PAS, GSC, PFO, SBC, ISA, and SVD) in southern California (Figure 1). The goal of TERRAscope is to provide high-quality broadband data needed for significant advances in both regional and global seismology. TERRAscope will replace the old Caltech seismographic network in ...
During the last six years, National Geophysical Research Institute, Hyderabad has established a semi-permanent seismological network of 5 8 broadband seismographs and 10 20 accelerographs in the Kachchh seismic zone, Gujarat with a prime objective to monitor the continued aftershock activity of the 2001 Mw 7.7 Bhuj mainshock. The reliable and accurate broadband data for the 8 ...
During the last six years, the National Geophysical Research Institute, Hyderabad has established a semi-permanent seismological network of 5 broadband seismographs and 10 accelerographs in the Kachchh seismic zone, Gujarat, with the prime objective to monitor the continued aftershock activity of the 2001 Mw7.7 Bhuj mainshock. The reliable and accurate broadband data for the ...
A five-year Next Generation Attenuation (NGA) East project to develop new ground motion prediction equations for stable continental regions (SCRs), including eastern North America (ENA), has begun at the Pacific Earthquake Engineering Research (PEER) Center funded by the Nuclear Regulatory Commission (NRC), the U.S. Geological Survey (USGS), the Electric Power Research Institute (EPRI), and the ...
The Mw6.3 L�Aquila earthquake of April 6, 2009 is the M>6 normal faulting earthquake with the best near-source strong motion observations. Seventeen strong motion accelerographs are within 50km of the surface projection of the fault plane. Of these ten are within 20 km, and four of them are right above the fault plane. The data coverage is further improved with additional ...
Obviously, structural damage caused by strong earthquakes can not only be attributed to defects in design or construction, but rather the widely discussed phenomenon of local site effects has to be considered as well. In the last decade extensive strong-motion measurements were carried out by the reconnaissance team of the German TaskForce for Earthquakes. Missions to Turkey in 1998 (Adana, ...
Most earthquake early warning systems (EEWS) developed so far are conceived as either `regional' (network-based) or `on-site' (stand-alone) systems. The recent implementation of nationwide, high dynamic range, dense accelerometer arrays makes now available, potentially in real time, unsaturated waveforms of moderate-to-large magnitude earthquakes recorded at very short epicentral distances ...
Seismicity along the San Jacinto fault suggests that a 40-km-long section near the twon of Anza may constitute a gap in the occurrence of ML=6-7 earthquakes. The potential for a gap-filling shock and the high rate of seismicity at the southern end of the gap (five events of 4.0<=ML<=5.5 since 1970) provided the impetus for deploying a digital seismic array to collect high-quality ground ...
The USGS seeks accelerograph spacing of 5-10 km in selected urban areas of the US to obtain spatially un-aliased recordings of strong ground motions during large earthquakes. These dense measurements will improve our ability to make rapid post-earthquake assessments of expected damage and contribute to the continuing development of engineering standards for construction. To ...
An earthquake sequence comprising of almost 200 events, with ML 2.0 to 4.7 oc- curred at about 10 km south of Aegion, the town heavily damaged by the ML = 6.2 earthquake of 1995. This region is of interest to the EC project cluster, the "Corinth Rift Laboratory". The sequence started in February 2001 and ended in July 2001. It was located by the regional short-period network of the University of ...
We summarize recent observations of long-period (0.5 - 2 s) seismic waves from seven local and regional earthquakes in the magnitude range 3.5 - 6.5, made using accelerograph arrays in the Sacramento/San Joaquin Delta, in the San Leandro basin, and in the Livermore Valley. The observations were made on both isolated accelerometers (both NetQuakes and traditional instruments) ...
We analyzed a pair of surface and downhole accelerographs at station SMNH01 of KiK-net, which experienced strong ground motion up to 844 gal by the 2000 Western Tottori Earthquake (06/10/2000, MW6.7), Japan, to examine how the shallow subsurface structure changes with time. Station SMNH01 has a borehole of 100 m depth, where sandy gravel distributes from 0 to 11 m depths, and ...
The Bam earthquake occurred in southeastern Iran at 05:26 A.M.(local time) on December 26, 2003 (epicenter: 29.010N, 58.266E, Mo=6.6x10**18Nm, Mw=6.5; ref.1). The earthquake had strike-slip mechanism (strike=175, dip=85, slip=153; ref.2) and source parameters (focal depth=4km, fault dimension=20kmx15km, Dmax=1.0m, stress drop=3.7MPa; ref.2). The earthquake struck the ancient city of Bam and killed ...
In the last decade extensive strong-motion measurements were carried out by the reconnaissance team of the German TaskForce for Earthquakes. Aftershocks were recorded by a mesh of temporarily installed strong-motion recorders during the field surveys to Turkey in 1998 (Adana/Ceyhan), 1999 (Izmit/Kocaeli and Duezce/Bolu) and 2002 (Sultandagi/Afyon). Particularly the two missions in 1999 provided ...
The Niigataken Chuetsu-Oki earthquake occurred on July 16, 2007, northwest-off Kashiwazaki in Niigata Prefecture, Japan, causing severe damages of ten people dead, about 1300 injured, about 1000 collapsed houses and major lifelines suspended. In particular, strong ground motions from the earthquake struck the Kashiwazaki-Kariwa nuclear power plant (hereafter KKNPP), triggering a fire at an ...
We employed layered model joint hypocentral determination (JHD) with station corrections to improve location identification for the 26 January, 2001 Mw 7.7 Bhuj early and late aftershock sequence. We relocated 999 early aftershocks using the data from a close combined network (National Geophysical Research Institute, India and Center for Earthquake Research Institute, USA) of 8 18 digital ...
We have chosen an area of approximately 79 km2, centered around the Cerro Prieto volcano, in the Mexicalli valley, Baja California, based on elevated registered acceleration data. The GEO station, located in the Cerro Prieto geothermal field has registered seismic accelerations on the order of 492 gales. The local residents near the study area have reported feeling numerous smaller magnitude ...
