U.S. Geological Survey General Earthquake Observation System National Strong Motion Program

Parkfield GEOS Data

This site contains earthquake and aftershock data collected by the United States Geological Survey (USGS) General Earthquake Observation System (GEOS) project in Menlo Park, California.

The binary data are available via anonymous FTP from the National Strong Ground Motion FTP-server: ftp://smftp.wr.usgs.gov in directory GEOS/PRK.


Station list


USGS Open-File Report 2004-1376: Borcherdt, Roger D., Malcolm J. S. Johnston, Christopher Dietel, Gary Glassmoyer, Doug Myren, and Christopher Stephens (2004). Acceleration and Volumetric Strain Generated by the Parkfield 2004 Earthquake on the GEOS Strong-Motion Array Near Parkfield, Calif.

Borcherdt, Roger D., Malcolm J. S. Johnston, Gary Glassmoyer, and Christopher Dietel (2006). Recordings of the 2004 Parkfield Earthquake on the General Earthquake Observation System Array: Implications for Earthquake Precursors, Fault Rupture, and Coseismic Strain Changes, Bull. Seism. Soc. Am. 96, 4B, S73-S89.

U.S. Department of the Interior
The USGS Home Page is at http://www.usgs.gov
The USGS Geologic Division Home Page is at http://geology.usgs.gov
The USGS National Strong Motion Program Home Page is at http://nsmp.wr.usgs.gov

The GEOS Home Page is at http://nsmp.wr.usgs.gov/GEOS/geos.html
The URL of this page is http://nsmp.wr.usgs.gov/GEOS/PRK/parkfield.html
e-mail: glassmoyer@usgs.gov
or address:
Gary Glassmoyer
345 Middlefield Road M/S 977
Menlo Park, California 94025