Creepmeter

The data listed below are measures of surface fault slip (scaled in mm) as measured by creepmeters. 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. There is an invar wire oriented 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).

For many of the creepmeters, the measurements are made once every 10 minutes and sent via satellite telemetry to Menlo Park for analysis. In addition, these measurements are periodically measured manually for comparison. For other creepmeters, the measurements are made manually.

Below is a list of creepmeters, from North to South, located on the San Andreas, Hayward, and Calaveras Faults. For each site, the available data are listed. These data have been hand-edited to remove periods of bad data and, where possible, compared with manual measurements. Since these represent human generated and cleaned data, these files are only updated periodically.

More information can be found in the USGS Open File Report: Catalog of creepmeter measurements in California from 1966 through 1988

For information on 5 sites along the Hayward Fault (cpp, ctm, coz, chp, and cfw) see: Surface Creep on California faults

NameCodeLatitudeLongitudeInitial obs.NotesManual data10-minute sampling1-day sampling

Calaveras Fault

Shore Rd #1XSH136.9430121.4450Apr 1986
Shore Rd #2SHR236.9430121.4450Apr 1986
Hollister CentralHLC136.8570121.4050Apr 1970
Hollister D StHLD136.8420121.4030Apr 1970

Hayward Fault

Pt PinoleCPP137.9900122.3550Aug. 1995
TemescalCTM137.8430122.2270Mar. 1997
Oakland ZooCOZ137.7530122.1500Nov. 1996
Hayward, Rose St #1HWR137.6800122.4450Apr 1968
Hayward, Rose St #2HWR237.6800122.4450Apr 1968
Hayward, D St #1HWE137.6700122.0800Apr 1968
Hayward, D St #2HWW137.6700122.0800Apr 1968
Hayward, Palisades St #1 HWP137.6630122.0750Apr 1968
Hayward, Palisades St #2CHP137.6630122.0730Apr 1994
Fremont WineryCFW137.5320121.9520Dec. 1993

San Andreas Fault

San Juan Bautista #2XSJ236.8370121.5200June 1969
San Juan Bautista #3XSJ336.8370121.5200Jan. 2007
Harris Ranch #2XHR236.7720121.4220Apr 1985
Harris Ranch #2XHR336.7720121.4220Aug. 2009
Cienega Winery CentralCWC336.7500121.3850Nov. 1968
Cienega Winery NorthCWN136.7500121.3850June 1972
Frank Lewis LongXFL136.6650121.2720April 1973
Melendy RanchXMR136.5950121.1870June 1969
Melendy WindmillMRW136.5850121.1770Sept. 1972
Dry Lake LongXDL236.4920121.07801973
BitterwaterBIT136.3980120.9820July 1979
Monarch Peak #1XMP136.2130120.7980June 1969
Monarch Peak #1XMP236.2130120.7980June 1969
Slacks CanyonXSC136.0650120.6280June 1979
Middle MtnXMM135.9580120.5020Oct. 1979
Middle Mtn; Big CreepXMBC35.9580120.5020Oct. 1979
Middle RidgeXMD135.9430120.4850July 1986
VarianXVA135.9220120.4620Apr 1987
Roberson, SW traceXRSW35.9070120.4600May 1987
Parkfield, #1XPK135.9020120.4420Oct. 1979
Parkfield, #2XPK235.9020120.4420Sept. 2004
Taylor RanchXTA135.8900120.4270Sept. 1985
Taylor Ranch; Big CreepTABC35.8900120.4270Sept. 1985
Durham RanchXDR235.8830120.4200July 1969
Hearst, SW traceXHSW35.8620120.4150June 1987
Work RanchWKR135.8580120.3920May 1966
Carr RanchCRR135.8350120.3630May 1966
Gold HillXGH135.8200120.3480July 1969
Highway 46C46135.7300-120.2900Sept. 2004
Highway 46X46135.7230120.2780Aug. 1986
Twisselman RanchTWR135.5970120.1470Nov. 1976
Panorama HillsXPH135.1480119.6920Aug. 1977

Dilatometer

The data listed below are measures of changes in volumetric strain (units of 0.001 part per million) as a function of time for instruments in California. Outliers due to telemetry problems, instrument visits, and etc have been removed. Offset due to valve resets have been removed. Data are provided in two modes; 1) Cleaned strain data and 2) Clean strain data adjusted for the Earth Tide and atmospheric pressure changes. Pressure data (not scaled to units of pressure) are also provided.

NameCodeLatitudeLongitudeInitial obs.NotesDilatation cleanDilitation adjustedPressure data

Long Valley

Big SpringsBG37.7610-118.9440Jul. 2007
PostpilePO37.6350-119.0830Jul. 2007
MotocrossMX37.6160-118.9520Jul. 2007

Parkfield

Donna LeaDL35.9400-120.4240Jan. 2008
Vineyard CanyonVC35.9220-120.5350Jan. 2008
FrolichFR35.9110-120.4870Jan. 2008
Jack CanyonJC35.7150-120.2060Dec. 2007
Red HillsRH35.6240-120.2570May 2008

San Francisco Bay Area

Russel RanchRR37.9200-122.1500Sept. 2006
GarinGA37.6500-122.0100Sept. 2006
SunolSU37.6400-121.9400Aug. 2006
CoyoteCY37.5630-122.0970Sept. 2006
Mill CreekMC37.5500-121.9000Jul 2006

Southern Californa

Chantry FlatCN34.1960-118.0230Feb. 2007
Big DaltonBD34.1680-117.8140Feb. 2007

Tensor Strainmeter

The data listed below are measures of changes in tensor strain (units of 0.001 part per million) as a function of time for instruments in California. Outliers due to telemetry problems, instrument visits, and etc have been removed. Offset due to valve resets, for the Carnegie, DTM instruments, have been removed. We are providing data for two different instruments, one is a three component strainmeter made by Carnegie Dept. of Terrestial Magnetism (DTM) and the other is a three or 4 component strainmeter made by GTSM Technologies. Since these instruments have at least 3 extensometers, these data can be combined into tensor strain based upon analysis using the Earth Tides. We provide both the extensometer and the tensor strain changes. Data are provided in two modes; 1) Cleaned strain data and 2) Clean strain data adjusted for the Earth Tide and atmospheric pressure changes. Pressure data (not scaled to units of pressure) are also provided. Gauge data for the DTM instruments are not scaled to physical units.

NameCodeLatitudeLongitudeInitial obs.Instrument typeNotesPressure dataGage data cleanGage data adjustedTensor data cleanTensor data adjusted

Parkfield

Donna LeaDLT35.9400-120.4250Jan. 1988
Frolich (2)FLT35.9100-120.4900Mar. 1988
Eades (3)EDT35.8900-120.4200Jan. 1988

San Francisco Bay Area

Saint VincentsSV38.0330-122.5260Jan. 2008
OhloneOH38.0070-122.2740Jan. 2008
Marin HeadlandsMH37.8420-122.4940May 2008
ChabotCHT37.7430-122.0970Jun. 1993
BrisbaneBB37.6870-122.4100Apr. 2008
Garin (1)GAT37.6500-122.0100Jan. 1993
Ox MountainOX37.4980-122.4250Jan. 2008
San Juan BautistaSJT36.8370-121.5440Jan. 1984

Southern California

ColdbrokCBT34.2900-117.8400Jan 1997
Pinon Flat (4)PFT33.6200-116.4500Jan 1983
  1. Ceased working in Sep 1998
  2. Ceased working; second gage in Dec 2005
  3. Ceased working in Apr 2002
  4. Ceased working in Dec 2002