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Open-File Report 02-225

Notice: This USGS Publication has been Superseded by Open-File Report 2009-1119

Data from Theodolite Measurements of Creep Rates on San Francisco Bay Region Faults, California: 1979–2001

By Jon S. Galehouse

Locations of alinement arrays. Regular arrays shown as triangles, afterslip arrays on Hayward Fault shown as dots. P, Point Pinole.Introduction

My purpose is to make our creep data on San Francisco Bay region active faults available to the scientific research community. My student research assistants and I measured creep (aseismic slip) rates on these faults from 1979 until my retirement from the project in 2001. These data are further described in my final technical report as principal investigator, which summarizes results from 22 September 1979 through 28 February 2001 (Galehouse, 2001). We made over 2,600 creep measurements, about one-third in the ten years prior to the Loma Prieta earthquake (LPEQ) and two-thirds in the 11.4 years following it. The measurements are continuing to be made by members of the Geosciences Department at San Francisco State University (SFSU) under the direction of Karen Grove and John Caskey. A complete analysis of our results obtained on the Hayward fault is presented in Lienkaemper, Galehouse, and Simpson (2001). A formal report based on the entire San Francisco Bay region data set is in preparation.

Data sheets for each site along the fault are available for downloading in Excel format to facilitate analysis of the data. They are also available as tab-delimited raw data. The data include all regular measurement sites, SF–1 through SF–34, and the 20 SFSU and U.S. Geological Survey (USGS) afterslip sites on the Hayward fault.

First posted June 10, 2002

  • SF Bay XLS (443 kB)
    Data base of measurements of creep rates at sites throughout the entire San Francisco Bay region, in XLS format
  • SF Bay TAR.GZ (34 kB)
    Compressed tar file of tab-delimited raw data from measurement sites throughout the entire San Francisco Bay region

For additional information, contact:
Earthquake Science Center, Menlo Park
U.S. Geological Survey
345 Middlefield Road MS 977
Menlo Park, California 94025

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Suggested citation:

Galehouse, Jon S., 2002, Data from Theodolite Measurements of Creep Rates on San Francisco Bay Region Faults, California: 1979–2001: U.S. Geological Survey Open-File Report 02-225, 94 pp.,

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