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Geophysics
Branch of geology studying the physical characteristics and phenomena of the earth and its atmosphere.
Subtopics:
Marine geophysics (9 items)
Seismology (51 items)
Tectonophysics (3 items)
Related topics:
Results 1 - 91 of 91 listed by similarity [list alphabetically]
PDF Introduction to potential fields: Gravity [New Window]
Explanation of the Earth's gravitational field, emphasizing how USGS scientists measure gravity and portray these measurements on maps. Explains terminology of gravity anomaly maps and their relationship to the rock types and other geologic features.
Geophysical products [New Window]
Links to products of magnetic, gravity, magnetotelluric, and multi-discipline reports and surveys of regions in the U.S. and Antarctica plus geophysical software tools. Some products are in PDF format.
Borehole geophysics as applied to geohydrology [New Window]
Project summary, photos of logging truck, and bibliographies on log interpretation techniques and instrumentation to record geophysical data in wells and test holes for studying ground water hydraulics and evaluate waste disposal sites.
Groundwater geophysical technology transfer [New Window]
Site to provide USGS scientists with web-based resoures to transfer new geophysical knowledge and experience; includes methods, tools, publications and training.
USGS develops geophysical methods to improve remediation monitoring and site characterization [New Window]
Short news article describing the use of electrical resistivity tomography to improve imaging of tracer flow in ground water.
Earthquake "Top 10" Lists & Maps [New Window]
Lists of largest earthquakes in the world and in the United States, earthquake facts and statistics, deaths from earthquakes, earthquakes by magnitude, and significant earthquakes.
Earthquake hazard maps [New Window]
National seismic hazards maps, global seismic hazards map, predictive intensity maps, shaking hazards maps and probabilities for California, and a variety of fact sheets on earthquakes.
Maps of recent earthquake activity in California-Nevada [New Window]
Near-real-time maps of location, ground motion, and shaking intensity of earthquakes in California and Nevada for the past hour, past day, and past week and links to other earthquake information.
Washington aeromagnetic maps and data [New Window]
Colored geomagnetic and gravity maps and related data and graphical plots for the state of Washington.
PDF A volcano rekindled; the renewed eruption of Mount St. Helens, 2004-2006 [New Window]
ANSS - Advanced National Seismic System [New Window]
Nationa network of seismic monitoring stations coordinated with a variety of regional organizations and academic institutions.
Advanced National Seismic System (seismic network) [New Window]
A program of studies with instruments to provide accurate and timely data and information on seismic events, including their effects on buildings and structures, employing modern monitoring methods and technologies.
Advanced National Seismic System: Products and services [New Window]
Maps, data, and services provided to help people understand earthquakes that have occurred.
Alaska mineral resources [New Window]
Reports, data, and current research on mineral resources in Alaska
Albuquerque Seismological Lab [New Window]
The USGS Seismological Laboratory in Albuquerque installs and maintains a world network of seismograph stations, collects the seismic data, and evaluates seismic instruments. Site includes links to ASL publications, earthquake maps and seismic data.
An interpretation of the 1977 Airborne Electromagnetic (AEM) survey, Fort Huachuca vicinity, Cochise County, Arizona [New Window]
Complex report on the interpretation of aeromagnetic data to study hydrogeology of the San Pedro basin, Cochise County, Arizona determining geologic structure, basin fill and depth to water. Online version of a CD-ROM publication.
Atlantic margin offshore sediments: cooperative database and GIS development website [New Window]
This site is designed to provide information on federal interagency and cooperative developments related to coastal sand and gravel resources and management issues along the Atlantic continental margin.
Cascadia subduction zone: two contrasting models of lithospheric structure [New Window]
Summary of an investigation of the Cascadia subduction zone with detailed density-modeling experiments of the crust and mantle along two transects across Vancouver Island and the Canadian margin and the other on the margin of central Oregon.
Central California /San Francisco Bay Earthquake Hazards Project [New Window]
Information on earthquakes in central California and the San Francisco region with links to four types of field studies, deep seismic investigations, geotechnical investigations, shallow seismic imaging, and airborne geophysical surveys.
Coastal and Marine Geology (CMG) InfoBank [New Window]
Access to InfoBank, an online data catalog, to browse or retrieve coastal and marine geology program information, images, and data on gravity, bathymetry, seismic activity, magnetics, samples, facilities, cruises and equipment.
Contamination in Fractured Rock Aquifers [New Window]
Overview of fractured rock research aimed at understanding the movement of water through fracture networks, and characterize field conditions influencing contaminant migration. Includes programs and publications.
Crustal Imaging and Characterization Team [New Window]
Crustal imaging and characterization home with links to projects on earth science technologies including geophysical, geochemical, and isotope studies, online publications and data, and newsletter Minerals News.
Earthquake Geology and Paleoseismology [New Window]
Geological effects of earthquakes on the crust and landscape, with studies of prehistoric earthquake activity using geological evidence.
Earthquake Hazards 101 [New Window]
Provides links to explanatory materials for the layperson, including information on concepts behind earthquake maps, the use of probability, what the maps mean, how they are made, and answers to frequently asked questions.
Earthquake Hazards 201 - Technical Information [New Window]
Provides detailed technical information on earthquake hazards in the form of frequently asked questions. Desisigned for the technical audience, including building and safety planners.
Earthquake Hazards Program [New Window]
Information on earthquake activity, earthquake science, and earthquake hazard reduction with links to news reports, products and services, educational resources for teachers, glossary, and current U.S. earthquake activity map.
Earthquake Hazards Program - Central and Eastern U.S. [New Window]
Information on earthquakes in central and eastern United States with links to earthquake monitoring, published products, recent earthquake information, discussion group, and current projects.
Earthquake Hazards Program - Northern California [New Window]
Home page for Northern California Earthquake Hazards Program with links to earthquake news, real-time earthquake and shaking maps, earthquake probabilities, latest earthquake information, hazards and preparedness, research and special features.
Earthquake Hazards Program - Southern California [New Window]
Site for the Southern California Earthquake Hazards Program with links to latest quake information, real-time earthquake maps and shaking maps, general information, hazards and preparedness, research, networks, and earthquakes for kids.
Earthquake Hazards Program external research support [New Window]
Abstracts, program announcements and descriptions of projects funded by the external research program.
Earthquake glossary [New Window]
Dictionary of terms associated with earthquakes with simple definitions and photographs especially suited for students.
Earthquake hazards software for download [New Window]
Numerous downloadable software packages for carrying out analyses, modeling, and ancillary calculations in earthquake research and monitoring.
Earthquake information by region [New Window]
Information on earthquake activity, maps, lists of significant earthquakes, earthquake preparedness, and earthquake research arranged by region.
Earthquake information by topic [New Window]
Information on earthquakes by topic including faults, tsunami, seismic waves, and plate tectonics.
Earthquake preparedness information [New Window]
Links to web sites, publications, and fact sheets on earthquake preparedness.
Earthquake science explained--a series of ten short articles for students, teachers, and families [New Window]
Collects a series of short articles on earthquake science and related topics for students, teachers, and parents originally published as weekly features in The San Francisco Chronicle.
Earthquake search [New Window]
Search interface allowing searches of earthquake databases by various parameters including date, depth, intensity, area, and magnitude and download data in a variety of formats.
Earthquake: Did you feel it? Report it here. [New Window]
Place to provide information about ground shaking associated with significant earthquakes. A questionnaire to let us know what you felt following an earthquake in the United States or in other countries.
Earthquakes [New Window]
Online booklet on earthquake history, earthquake occurrences, measuring earthquakes, causes, relationship of volcanoes and earthquakes and earthquake prediction.
Earthquakes for kids [New Window]
Links to various earthquake projects, facts, science fair ideas, earthquake science, becoming an earthquake scientist, image glossary, earthquake facts, and puzzles and games for children.
Earthquakes: Frequently Asked Questions [New Window]
Answers to a wide variety of questions (FAQs) about earthquakes, such as dictionary of terms, earthquake activity and probabilities, common myths, faults, plate tectonics, and earthquake measurement techniques.
Executive summary, workshop: seismic and tsunami hazard in Puerto Rico and the Virgin Islands [New Window]
Summary of workshop with links to reports that are recommendations for future projects.
General Earthquake Observation System (GEOS) [New Window]
Earthquake and aftershock data collected by the USGS General Earthquake Observation System project in Menlo Park, California.
Geologic hazards team office [New Window]
An organizational unit within USGS that studies earthquakes, landslides, and geomagnetism. Contact information and descriptions of current research projects.
Geology [New Window]
Homepage about the Geology Discipline with links to what's new, publications, real-time hazards information, partnerships, fellowship program, and major science programs.
Geomagnetic FAQs [New Window]
Frequently-asked questions, with answers, about the Earth's magnetic field.
Geomagnetic charts [New Window]
Links to charts of the Earth's magnetic field in different projections showing declination, inclination, and total, horizontal and vertical intensities plus references and note on limitations.
Geomagnetic models [New Window]
Description of magnetic models with link to on-line calculation, freeware calculator (DOS and Windows), descriptions of model types, and references.
Geomagnetic observatories [New Window]
Map showing geomagnetic observatories, with detailed information about each one
Geopubs: on-line geologic publications of the western United States [New Window]
Access to USGS on-line geologic publications of the western United States categorized by state, region USGS series, geologic maps, and software with links to state geologic survey publications.
Global Seismographic Network [New Window]
Worldwide network of seismic monitoring stations coordinated by a variety of national and international organizations.
Ground-water resources of Louisiana [New Window]
Links to Louisiana statewide aquifer and well information by locating parish on a map or selecting parish, aquifer, region, or type of ground-water data (real-time water levels or geophysical data) from lists.
Gulf Coast Framework Studies Home Page [New Window]
Provides geologic, geophysical, and geochemical framework studies that will aid in a reassessment of energy commodities (coal, gas, and oil) in the Gulf Coast Region.
Historical earthquakes: lists and statistics [New Window]
Lists and maps of historic earthquakes by geographic area, magnitude, destructiveness, and other characteristics.
Hydrogeologic framework of Antelope Valley and Bedell Flat, Washoe County, west-central Nevada [New Window]
Description of the hydrogeologic framework of Antelope Valley and Bedell Flat in west-central Nevada north of Reno-Sparks area. Gravimetric and seismic-refraction methods were used in the study. Report available in PDF format or HTML format.
PDF Introduction to potential fields: Magnetics [New Window]
Explanation of the Earth's magnetic field and how USGS measures it. Defines magnetic anomaly, induced and remanent magnetism in rocks, and describes magnetic anomaly maps.
Latest earthquakes in the USA - Past 7 days [New Window]
Real-time earthquake maps of the conterminous U.S., Alaska, Hawaii, and Puerto Rico displaying magnitude and location of earthquake activity in the past hour, past day, and past week.
Long Island Sound sidescan sonar mosaics [New Window]
Sidescan sonar image, surficial geologic interpretation, and bathymetry of the Long Island Sound sea floor.
Major quake likely to strike San Francisco Bay Region between 2003 and 2032 [New Window]
Study of the probability of a major earthquake in San Francisco Bay region with colored map and links to relevant publications. Text also available in PDF format and graphic available in Illustrator or Photoshop format.
Marine research publications [New Window]
Bibliography of publications relating to the research of the United States Geological Survey, Woods Hole, MA dating from 1962 to the present with links to publications that are online. Listed by series and with a free text search option.
Methods of installing United States National Seismographic Network (USNSN) stations: a construction manual [New Window]
Instructions on how to build a protective outdoor seismic vault used as stations for broadband seismic sensors that respond to seismic energy, temperature, and atmospheric pressure for the United States National Seismic Network in PDF format.
Mineral resources spatial data [New Window]
Geochemical, geological, geophysical, mineral, and general reference spatial datasets that users can locate and download.
PDF Monitoring the Earth's dynamic magnetic field [New Window]
Describes the reasons why USGS monitors Earth's magnetic field and the history of that monitoring effort.
Multibeam data and socio-economic issues in west-central San Francisco Bay [New Window]
Webpage based on USGS Open File Report 98-139 links to information on the San Francisco Bay estuary to study dredge disposal effects, fish habitats, sediment transport, rock pinnacles and navigation, and consequences of a large oil spill.
Multibeam mapping of the West Florida Shelf, Gulf of Mexico [New Window]
Georeferenced high-resolution mapping of bathymetry of the West Florida Shelf, Gulf of Mexico of areas suspected to be critical benthic habitats for fisheries. Includes links to images, data, metadata, and TIFF image files.
National Earthquake Information Center [New Window]
Information on world earthquake activity with links to facts and lists on large earthquakes, earthquake e-mail notification, hazards and preparedness, educational links, news and highlights and other seismic information.
National Geomagnetism Program [New Window]
Overview of USGS programs related to geomagnetism including observatories, data, program services, links to models, charts, and movies, program contacts, Intermagnet, Geomag, publications, and bibliographies.
Nearshore Benthic Habitat Project [New Window]
Homepage for the Nearshore Benthic Habitats Project for mapping geophysical characterization of the coastal sea floor to identify benthic fish and shellfish habitat with links to research cruises and preliminary results.
P-wave data from the Indian subcontinent [New Window]
Compilation of P-wave data from the Indian subcontinent Deep Seismic Sounding (DSS) profiles that used refraction and reflection techniques to provide an estimate of crustal thickness across the subcontinent.
Puget lowland paleoseismology [New Window]
Homepage for a paleoseismic field study of the geologic record of prehistoric earthquakes in the Puget Lowland region to evaluate seismic hazards with links to an atlas and reports on historic earthquakes in the Washington and Oregon area.
Real-time seismogram displays [New Window]
Description of seismograms and how they are produced by drum recorders and electronic instruments with real-time seismograms for Northern California and Long Valley, California and representative seismograms for types of earthquake activity.
Recent earthquakes in Hawaii [New Window]
Interactive maps of earthquakes of last 2 hours, last 2 days, and last 2 weeks in Hawaii.
San Andreas Fault [New Window]
Online booklet on the San Andreas fault system on the California coastal region with discussion of faults, relationship of faults and earthquakes, magnitude of earthquakes, and earthquake probability.
San Francisco Bay Region geology [New Window]
Gateway to the geology of the San Francisco Bay region with links to geologic maps, paleontology, marine geology, earthquakes, landslides, and geophysics. Includes maps, 3-D models, and photos.
Schlumberger soundings at the Amargosa Desert Research Site, Nevada [New Window]
Report presenting the data, automatic interpretations, cross sections, and resistivity maps of direct current electrical soundings at the Amargosa Desert Research Site near Beatty, Nevada using a Schlumberger array.
Seismic properties of North America and the surrounding ocean basins [New Window]
Presentation of maps of the seismic properties of North America and the surrounding ocean basins compiled from seismic refraction and reflection data, earthquake studies, and surface wave analyses showing crustal thickness and geologic provinces.
Severity of an earthquake [New Window]
Description of intensity and magnitude as indicators of the size of an earthquake and the levels of severity measured on the Richter Magnitude Scale and the Modified Mercalli Intensity Scale.
ShakeMap [New Window]
ShakeMap sites provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.
Southern California Integrated GPS Network (SCIGN) [New Window]
Homepage for the Southern California Integrated GPS Network (SCIGN) Pasadena Field Office involved in operating GPS stations, data recording, and supplying of earthquake data. Links to GPS data analysis, photos, and technical information.
Southern California Mapping Project (SCAMP) [New Window]
Description of the SCAMP project to produce geologic and geophysical maps and reports that describe the geologic setting and geologic history of southern California.
Studies in Long Island Sound: geology, contaminants, and environmental issues [New Window]
Description of Long Island Sound projects and links to research topics, data, publications, photos, and technology on sediment transport, sea floor mapping, contaminant sampling, sediment texture, and environmental issues.
The Earth's crust [New Window]
Information on the Earth's crust with a contour map of the thickness plus links to a global crustal database, a global crustal model - CRUST 5.1, and regional crustal models.
The Parkfield Experiment - capturing what happens in an earthquake [New Window]
Fact sheet describing plans for a San Andreas Fault Observatory at Depth (SAFOD) by drilling into the fault to install instruments for long-term monitoring near the location of the magnitude 6 Parkfield earthquakes.
The U.S. Geological Survey Ocean Bottom Seismometer Facility [New Window]
The Ocean Bottom Seismometer facility provides technical support for a variety of scientific investigations ranging from deep crustal structure to gas hydrate and surface sediments.
The great 1906 earthquake, 100 years later [New Window]
Annotated list of resources about the great earthquake of 1906, which caused significant devastation in and around San Francisco, California, compiled for the 100th anniversary of the disaster.
The sea-floor mapping facility at the U.S. Geological Survey Woods Hole Field Center, Woods Hole, Massachusetts [New Window]
Fact sheet on the sea-floor mapping facility at Woods Hole describing state-of-the-art technology used to produce accurate geologic maps of the sea floor and reporting on its data-acquisition, data-processing, and archiving capabilities.
This dynamic Earth: the story of plate tectonics [New Window]
Online booklet giving an introduction to the concept of plate tectonics and complements the information on the map This Dynamic Planet published in 1994 by the U.S. Geological Survey (USGS) and the Smithsonian Institution.
This dynamic planet: World map of volcanoes, earthquakes, impact craters, and plate tectonics [New Window]
Online world map with booklet (PDF format) giving an account of plate tectonics, volcanology, earthquake activity, and impact craters.
United States National Strong-Motion Program (NSMP) [New Window]
National Strong-Motion Program home page with links to program news, recent events, and datasets of digitized accelerograms downloadable as PC (*.zip) and Unix (*.tar.z) files, data processing, stations, research, publications, and personnel.
What is an Ocean Bottom Seismometer? [New Window]
Description and uses of the Ocean Bottom Seismometer; a self contained data-acquisition system which free falls to the ocean floor and records seismic data generated by airguns and earthquakes.
What on Earth is plate tectonics? [New Window]
Discussion and diagrams on plate tectonics and the structure of the Earth for beginners with link to a detailed version: This Dynamic Earth for more information.


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