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NSMP STATIONS
The NSMP National Strong-Motion Network (NSMN) currently operates over 1,000 strong-motion devices at approximately 700 permanent stations (STATION LIST (updated 10/09/2008), Maps (updated 08/01/2007) located in 33 States and the Caribbean (distribution of strong-motion stations by state; updated 02/08/2007). Recorders are currently installed at approximately 210 structures, which includes 133 buildings, 17 bridges and over crossings, and 60 dams. Over 40 instrumented buildings have 6 or more seismic sensors and several have 36 or more seismic sensors (ex: Los Angeles, San Francisco Bay Region). The NSMN is primarily the result of cooperative efforts with many other federal, state, and local agencies, private companies, and academic institutions (LIST; updated 02/08/2007). Key participants for which the NSMP presently maintains instrumentation include the U.S. Army Corps of Engineers, the U.S. Department of Veterans Affairs, and the Metropolitan Water District of Southern California.
Instrumentation in the NSMN is currently comprised of approximately 79% digital recorders (distribution of strong-motion instruments by type; updated 02/08/2007). The analog ground stations generally contain Kinemetrics, Inc. optical-mechanical model SMA-1 recorders with internal triaxial force-balance accelerometers. Time is typically provided by either an internal clock or WWVB radio receiver. Accelerations are recorded on 70-mm photographic film. These battery-operated recorders remain in a standby mode until triggered by significant ground motion. Analog structural instrumentation is similar but contains multiple (typically 12 or more) sensors located throughout a structure, which are hard-wired to a single film recorder at a remote location. The NSMN has approximately 762 digital recorders, located primarily in California, Hawaii, Puerto Rico, and the Pacific northwest. Instrumentation is similar to the analog recorders but records in solid state or flash-card memory rather than on film; operates in a triggered mode but contains a pre-event memory; and provides timing via a GPS receiver. Ground stations may contain 3-6 channels while structure stations may contain 12-72 remote channels.
Four hundred and twenty NSMP digital recorders (330 dial-up and 90 real-time; total updated 02/22/2007) are hooked up to telephone lines for rapid retrieval and interpretation of on-scale (strong-motion) measurements in urbanized areas for near-real time damage assessments and emergency response evaluation and deployment. The NSMP Near-Real-Time Acquisition System has been in operation since 1999. Maps (updated 08/01/2007)
The NSMP Network Operations Database (NOD) facilitates the coordination of station, recorder, transducer, and inspection data with earthquake and record information.
The NSMP General Earthquake Observation System (GEOS) project maintains 95 high-fidelity, wide-dynamic range recorders for operation of arrays and for critical post earthquake response studies. Tables of station locations, event locations, ordered arrival lists, and trigger are available via the GEOS Home Page.
Currently Active Stations
Click here to view the complete currently active Station List sorted by station number.
(updated 10/09/2008)Warning: these station lists are big files and may take a few seconds to tens of seconds before they will be displayed depending on the web browser used and the connection speed. Netscape Communicator users may need to hit the reload button if the station list does not display. Users that get a popup window requesting username and password, should click on the "cancel" button.
The precision of the station latitude and longitude varies depending on the method used to obtain the coordinates (i.e. topographic map, GPS, differential GPS). Users who wish to print out a paper copy of the station list will need to set the paper orientation to "landscape" and possibility modify the output margins to prevent truncation of station parameters.
Distribution of Stations
(updated 02/08/2007)Currently Active Stations
(updated 03/13/2007)Dial-up Station Maps (updated 08/01/2007)
Real-time Station Maps (updated 08/01/2007)
This page was last modified on 10/09/2008.
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