Download Fault Creep Data From Central California
The data represent real-time measurements of fault slip across the San Andreas Fault in Central California, its "southwest" trace near Parkfield, California, and the San Andreas Fault and Calaveras Fault near San Juan Bautista, California.
Creepmeters consist of two piers separated by about 30 meters and connected by an invar wire. The main fault trace lies between the two piers. The invar wire is at roughly a 30 degree angle from the local trace of the fault. A displacement transducer (LVDT) measures the change in length of the wire (or the change in distance between the piers). These measurements are made once every 10 minutes and are telemetered to the USGS in Menlo Park. In addition, micrometer measurements are periodically made during site visits. The telemetered data are reconciled with the micrometer measurements, then converted to daily measurements and scaled to represent fault slip in millimeters. At some sites near Parkfield, low-resolution, high-range, creep measurements are telemetered in conjunction with the high-resolution measurements.
For a detailed description of the creep sites and associated data, please view the README file.
The data are available at ftp://ehzftp.wr.usgs.gov/langbein/CREEP in the following directories:
| DAY | Creep daily samples reconciled with micrometer data (right lateral positive) |
|---|---|
| MIC | Micrometer measurements of creep (right lateral positive) |
| CL10 | Telemetered 10 minute samples in units of digital counts with telemetry glitches and human-induced offsets removed. |
| PKF_EQ | Telemetered 10 minute samples, commencing March 2004 that span the September 26, 2004 Parkfield Earthquake. Data have been scaled and stored in millimeters of creep. |
| PLOTS | Plots (postscript and .pdf) of differences between micrometer (MIC directory) and telemetered creep data (DAY directory). |
