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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: http://cires.colorado.edu/~bilham/creepmeter.file/creepmeters.htm

NameCodeLatitudeLongitudeInitial obs.NotesManual data10-minute sampling1-day sampling
Calaveras Fault
Hollister D StHLD136.8420121.4030Apr 1970NYNN
Hollister CentralHLC136.8570121.4050Apr 1970NYNN
Shore Rd #2SHR236.9430121.4450Apr 1986NYNN
Shore Rd #1XSH136.9430121.4450Apr 1986NYNY
Hayward Fault
Fremont WineryCFW137.5320121.9520Dec. 1993NNYN
Hayward, Palisades St #2CHP137.6630122.0730Apr 1994NNYN
Hayward, Palisades St #1 HWP137.6630122.0750Apr 1968NYNN
Hayward, D St #2HWW137.6700122.0800Apr 1968NYNN
Hayward, D St #1HWE137.6700122.0800Apr 1968NYNN
Hayward, Rose St #2HWR237.6800122.4450Apr 1968NYNN
Hayward, Rose St #1HWR137.6800122.4450Apr 1968NYNN
Oakland ZooCOZ137.7530122.1500Nov. 1996NNYN
TemescalCTM137.8430122.2270Mar. 1997NNYN
Pt PinoleCPP137.9900122.3550Aug. 1995NNYN
San Andreas Fault
Panorama HillsXPH135.1480119.6920Aug. 1977NYNY
Twisselman RanchTWR135.5970120.1470Nov. 1976NYNY
Highway 46X46135.7230120.2780Aug. 1986YYYY
Highway 46C46135.7300-120.2900Sept. 2004NYYN
Gold HillXGH135.8200120.3480July 1969YYYY
Carr RanchCRR135.8350120.3630May 1966YYYY
Work RanchWKR135.8580120.3920May 1966YYYY
Hearst, SW traceXHSW35.8620120.4150June 1987YYYY
Durham RanchXDR235.8830120.4200July 1969NYNN
Taylor RanchXTA135.8900120.4270Sept. 1985YYYY
Taylor Ranch; Big CreepTABC35.8900120.4270Sept. 1985NYNN
Parkfield, #2XPK235.9020120.4420Sept. 2004YYYY
Parkfield, #1XPK135.9020120.4420Oct. 1979YYYY
Roberson, SW traceXRSW35.9070120.4600May 1987YYYY
VarianXVA135.9220120.4620Apr 1987YYYY
Middle RidgeXMD135.9430120.4850July 1986YYYY
Middle MtnXMM135.9580120.5020Oct. 1979YYYY
Middle Mtn; Big CreepXMBC35.9580120.5020Oct. 1979NYNN
Slacks CanyonXSC136.0650120.6280June 1979YYYY
Monarch Peak #1XMP236.2130120.7980June 1969NYNN
Monarch Peak #1XMP1 36.2130120.7980June 1969NYNN
BitterwaterBIT1 36.3980120.9820July 1979NYNN
Dry Lake LongXDL236.4920121.07801973NYNN
Melendy WindmillMRW136.5850121.1770Sept. 1972NYNN
Melendy RanchXMR136.5950121.1870June 1969YYYY
Frank Lewis LongXFL136.6650121.2720April 1973NYNY
Cienega Winery NorthCWN136.7500121.3850June 1972YYYY
Cienega Winery CentralCWC336.7500121.3850Nov. 1968YYYY
Harris Ranch #2XHR236.7720121.4220Apr 1985YYYY
Harris Ranch #2XHR336.7720121.4220Aug. 2009YYYY
San Juan Bautista #2XSJ2 36.8370121.5200June 1969YYYY
San Juan Bautista #3XSJ3 36.8370121.5200Jan. 2007YYYY

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
MotocrossMX37.6160-118.9520Jul. 2007YYYY
PostpilePO37.6350-119.0830Jul. 2007YYYY
Big SpringsBG37.7610-118.9440Jul. 2007YYYY
Parkfield
Red HillsRH35.6240-120.2570May 2008YYYY
Jack CanyonJC35.7150-120.2060Dec. 2007YYYY
FrolichFR35.9110-120.4870Jan. 2008YYYY
Vineyard CanyonVC35.9220-120.5350Jan. 2008YYYY
Donna LeaDL35.9400-120.4240Jan. 2008YYYY
San Francisco Bay Area
Mill CreekMC37.5500-121.9000Jul 2006YYYY
CoyoteCY37.5630-122.0970Sept. 2006YYYY
SunolSU37.6400-121.9400Aug. 2006YYYY
GarinGA37.6500-122.0100Sept. 2006YYYY
Russel RanchRR37.9200-122.1500Sept. 2006YYYY
Southern Californa
Big DaltonBD34.1680-117.8140Feb. 2007YYYY
Chantry FlatCN34.1960-118.0230Feb. 2007YYYY

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
Eades (3)EDT35.8900-120.4200Jan. 1988GTSMYNYNYN
Frolich (2)FLT35.9100-120.4900Mar. 1988GTSMYNYNYN
Donna LeaDLT35.9400-120.4250Jan. 1988GTSMYNYNYN
San Francisco Bay Area
San Juan BautistaSJT36.8370-121.5440Jan. 1984GTSMYNYNYN
Ox MountainOX37.4980-122.4250Jan. 2008DTMYYYYYY
Garin (1)GAT37.6500-122.0100Jan. 1993GTSMYNYNYN
BrisbaneBB37.6870-122.4100Apr. 2008DTMYYYYYY
ChabotCHT37.7430-122.0970Jun. 1993GTSMYNYNYN
Marin HeadlandsMH37.8420-122.4940May 2008DTMYYYYYY
OhloneOH38.0070-122.2740Jan. 2008DTMYYYYYY
Saint VincentsSV38.0330-122.5260Jan. 2008DTMYYYYYY
Southern California
Pinon Flat (4)PFT33.6200-116.4500Jan 1983GTSMYNYNYN
ColdbrokCBT34.2900-117.8400Jan 1997GTSMYNYNYN

(1)—Ceased working Sept. 1998
(2)—Ceased working; second gage in Dec 2005
(3)—Ceased working Apr. 2002
(4)—Ceased working Dec. 2002