Download Data
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 at: http://pubs.er.usgs.gov/#search:basic/query=89-650/page=1/page_size=100:0
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
| Name | Code | Latitude | Longitude | Initial obs. | Notes | Manual data | 10-minute sampling | 1-day sampling |
|---|---|---|---|---|---|---|---|---|
| Calaveras Fault | ||||||||
| Hollister D St | HLD1 | 36.8420 | 121.4030 | Apr 1970 | N | Y | N | N |
| Hollister Central | HLC1 | 36.8570 | 121.4050 | Apr 1970 | N | Y | N | N |
| Shore Rd #1 | SHR2 | 36.9430 | 121.4450 | Apr 1986 | N | Y | N | N |
| Shore Rd #1 | XSH1 | 36.9430 | 121.4450 | Apr 1986 | N | Y | N | N |
| Hayward Fault | ||||||||
| Fremont Winery | CFW1 | 37.5320 | 121.9520 | Dec. 1993 | N | N | Y | N |
| Hayward, Palisades St #2 | CHP1 | 37.6630 | 122.0730 | Apr 1994 | N | N | Y | N |
| Hayward, Palisades St #1 | HWP1 | 37.6630 | 122.0750 | Apr 1968 | N | Y | N | N |
| Hayward, D St #2 | HWW1 | 37.6700 | 122.0800 | Apr 1968 | N | Y | N | N |
| Hayward, D St #1 | HWE1 | 37.6700 | 122.0800 | Apr 1968 | N | Y | N | N |
| Hayward, Rose St #2 | HWR2 | 37.6800 | 122.4450 | Apr 1968 | N | Y | N | N |
| Hayward, Rose St #1 | HWR1 | 37.6800 | 122.4450 | Apr 1968 | N | Y | N | N |
| Oakland Zoo | COZ1 | 37.7530 | 122.1500 | Nov. 1996 | N | N | Y | N |
| Temescal | CTM1 | 37.8430 | 122.2270 | Mar. 1997 | N | N | Y | N |
| Pt Pinole | CPP1 | 37.9900 | 122.3550 | Aug. 1995 | N | N | Y | N |
| San Andreas Fault | ||||||||
| Panorama Hills | XPH1 | 35.1480 | 119.6920 | Aug. 1977 | N | Y | N | N |
| Twisselman Ranch | TWR1 | 35.5970 | 120.1470 | Nov. 1976 | N | Y | N | N |
| Highway 46 | X461 | 35.7230 | 120.2780 | Aug. 1986 | Y | Y | Y | Y |
| Gold Hill | XGH1 | 35.8200 | 120.3480 | July 1969 | Y | Y | Y | Y |
| Carr Ranch | CRR1 | 35.8350 | 120.3630 | May 1966 | Y | Y | Y | Y |
| Work Ranch | WKR1 | 35.8580 | 120.3920 | May 1966 | Y | Y | Y | Y |
| Hearst, SW trace | XHSW | 35.8620 | 120.4150 | June 1987 | Y | Y | Y | Y |
| Durham Ranch | XDR2 | 35.8830 | 120.4200 | July 1969 | N | Y | N | N |
| Taylor Ranch; Big Creep | TABC | 35.8900 | 120.4270 | Sept. 1985 | N | Y | N | N |
| Taylor Ranch | XTA1 | 35.8900 | 120.4270 | Sept. 1985 | Y | Y | Y | Y |
| Parkfield, #1 | XPK1 | 35.9020 | 120.4420 | Oct. 1979 | Y | Y | Y | Y |
| Parkfield, #2 | XPK2 | 35.9020 | 120.4420 | Sept. 2004 | Y | Y | Y | Y |
| Roberson, SW trace | XRSW | 35.9070 | 120.4600 | May 1987 | Y | Y | Y | Y |
| Varian | XVA1 | 35.9220 | 120.4620 | Apr 1987 | Y | Y | Y | Y |
| Middle Ridge | XMD1 | 35.9430 | 120.4850 | July 1986 | Y | Y | Y | Y |
| Middle Mtn | XMM1 | 35.9580 | 120.5020 | Oct. 1979 | Y | Y | Y | Y |
| Middle Mtn; Big Creep | XMBC | 35.9580 | 120.5020 | Oct. 1979 | N | Y | N | N |
| Slacks Canyon | XSC1 | 36.0650 | 120.6280 | June 1979 | Y | Y | Y | Y |
| Monarch Peak #1 | XMP2 | 36.2130 | 120.7980 | June 1969 | N | Y | N | N |
| Monarch Peak #1 | XMP1 | 36.2130 | 120.7980 | June 1969 | N | Y | N | N |
| Bitterwater | BIT1 | 36.3980 | 120.9820 | July 1979 | N | Y | N | N |
| Dry Lake Long | XDL2 | 36.4920 | 121.0780 | 1973 | N | Y | N | N |
| Melendy Windmill | MRW1 | 36.5850 | 121.1770 | Sept. 1972 | N | Y | N | N |
| Melendy Ranch | XMR1 | 36.5950 | 121.1870 | June 1969 | Y | Y | Y | Y |
| Frank Lewis Long | XFL1 | 36.6650 | 121.2720 | April 1973 | N | Y | N | N |
| Cienega Winery North | CWN1 | 36.7500 | 121.3850 | June 1972 | Y | Y | Y | Y |
| Cienega Winery Central | CWC3 | 36.7500 | 121.3850 | Nov. 1968 | Y | Y | Y | Y |
| Harris Ranch #2 | XHR2 | 36.7720 | 121.4220 | Apr 1985 | Y | Y | Y | Y |
| Harris Ranch #2 | XHR3 | 36.7720 | 121.4220 | Aug. 2009 | Y | Y | Y | Y |
| San Juan Bautista #3 | XSJ3 | 36.8370 | 121.5200 | Jan. 2007 | Y | Y | Y | Y |
| San Juan Bautista #2 | XSJ2 | 36.8370 | 121.5200 | June 1969 | Y | Y | Y | Y |
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.
| Name | Code | Latitude | Longitude | Initial obs. | Notes | Dilatation clean | Dilitation adjusted | Pressure data |
|---|---|---|---|---|---|---|---|---|
| Long Valley | ||||||||
| Big Springs | BG | 0.0000 | 0.0000 | Jul. 2007 | Y | Y | Y | Y |
| Motocross | MX | 0.0000 | 0.0000 | Jul. 2007 | Y | Y | Y | Y |
| Postpile | PO | 0.0000 | 0.0000 | Jul. 2007 | Y | Y | Y | Y |
| Parkfield | ||||||||
| Red Hills | RH | 35.6240 | -120.2570 | May 2008 | Y | Y | Y | Y |
| Jack Canyon | JC | 35.7150 | -120.2060 | Dec. 2007 | Y | Y | Y | Y |
| Frolich | FR | 35.9110 | -120.4870 | Jan. 2008 | Y | Y | Y | Y |
| Vineyard Canyon | VC | 35.9220 | -120.5350 | Jan. 2008 | Y | Y | Y | Y |
| Donna Lea | DL | 35.9400 | -120.4240 | Jan. 2008 | Y | Y | Y | Y |
| San Francisco Bay Area | ||||||||
| Mill Creek | MC | 37.5500 | -121.9000 | Jul 2006 | Y | Y | Y | Y |
| Sunol | SU | 37.6400 | -121.9400 | Aug. 2006 | Y | Y | Y | Y |
| Garin | GA | 37.6500 | -122.0100 | Sept. 2006 | Y | Y | Y | Y |
| Russel Ranch | RR | 37.9200 | -122.1500 | Sept. 2006 | Y | Y | Y | Y |
| Southern Californa | ||||||||
| Big Dalton | BD | 0.0000 | 0.0000 | Feb. 2007 | Y | Y | Y | Y |
| Chantry Flat | CN | 0.0000 | 0.0000 | Feb. 2007 | Y | Y | Y | Y |
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.
| Name | Code | Latitude | Longitude | Initial obs. | Instrument type | Notes | Pressure data | Gage data clean | Gage data adjusted | Tensor data clean | Tensor data adjusted |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Parkfield | |||||||||||
| Eades (3) | EDT | 35.8900 | -120.4200 | Jan. 1988 | GTSM | Y | N | Y | N | Y | N |
| Frolich (2) | FLT | 35.9100 | -120.4900 | Mar. 1988 | GTSM | Y | N | Y | N | Y | N |
| Donna Lea | DLT | 35.9400 | -120.4250 | Jan. 1988 | GTSM | Y | N | Y | N | Y | N |
| San Francisco Bay Area | |||||||||||
| San Juan Bautista | SJT | 36.8370 | -121.5441 | Jan. 1984 | GTSM | Y | N | Y | N | Y | N |
| Ox Mountain | OX | 37.4980 | -122.4250 | Jan. 2008 | DTM | Y | Y | Y | Y | Y | Y |
| Garin (1) | GAT | 37.6500 | -122.0100 | Jan. 1993 | GTSM | Y | N | Y | N | Y | N |
| Brisbane | BB | 37.6870 | -122.4100 | Apr. 2008 | DTM | Y | Y | Y | Y | Y | Y |
| Chabot | CHT | 37.7430 | -122.0970 | Jun. 1993 | GTSM | Y | N | Y | N | Y | N |
| Marin Headlands | MH | 37.8420 | -122.4940 | May 2008 | DTM | Y | Y | Y | Y | Y | Y |
| Ohlone | OH | 38.0070 | -122.2740 | Jan. 2008 | DTM | Y | Y | Y | Y | Y | Y |
| Saint Vincents | SV | 38.0330 | -122.5260 | Jan. 2008 | DTM | Y | Y | Y | Y | Y | Y |
| Southern California | |||||||||||
| Pinon Flat (4) | PFT | 33.6200 | -116.4500 | Jan 1983 | GTSM | Y | N | Y | N | Y | N |
| Coldbrok | CBT | 34.2900 | -117.8400 | Jan 1997 | GTSM | Y | N | Y | N | Y | N |
(1)—Ceased working Sept. 1998
(2)—Ceased working; second gage in Dec 2005
(3)—Ceased working Apr. 2002
(4)—Ceased working Dec. 2002
