U.S. Geological Survey       National Strong-Motion Program





Currently Active Stations

Click here to download an Excel version of the currently active Station List (updated 04/03/2014). This is a large spreadsheet.  Users might experience difficulty if using a browser to open the file.  Downloading the file directly to a disk (right click on link and then "save target as") usually works better.

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, Google Earth).


NSMP Google Earth Station Map (updated 02/28/2014) In Google Earth, place cursor on icon to get station code and left-mouse-click on icon to get popup with station information and photo. 

COSMOS Tables (Excel spreadsheet)

(requires Google Earth, http://earth.google.com/)

Distribution of Stations

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The NSMP currently operates over 1,000 strong-motion devices at over 700 permanent stations located in 33 States and the Caribbean (distribution of strong-motion stations by state; updated 07/02/2012).  The NSMP is primarily the result of cooperative efforts with many other federal, state, and local agencies, private companies, and academic institutions (LIST; updated 07/02/2012). 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 is currently comprised of over 90% digital recorders (distribution of strong-motion instruments by type; updated 11/21/2013).  The NSMP has over 1,000 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. The 62 analog ground stations contain Kinemetrics, Inc. optical-mechanical model SMA-1 recorders with internal triaxial force-balance accelerometers.

Five hundred ninety-nine digital recorders (368 dial-up and 231 real-time; total updated 12/24/2013) are hooked up to telephone or internet connections 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.

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.

This page was last modified on 04/03/2014.

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