Click on the named data file below for data up to 10 January 2008. The northern two of the Parkfield sites have been discontinued.
For detailed data prior to 2006 see earlier data access page. For data up to today's date click here and enter user name geo & password hobo. Select site of interest, inspect graph, and/or download calibrated numeric values

Summary of Hayward fault data January 2006 to January 2008

All the Hayward fault creep data between 2006 and 2008 are listed in the following 6 column files (downloadable below).
The first column in each is the date and time in the following format: DD/MM/YY HH:MM:SS, the remaining columns contain data as dextral creep in mm. Only the first two decimal places are significant. The sites are listed sequentially in columns from south to north: Fremont, Palisades, Oakland Zoo, Temescal and Pinole. Five formats are provided for download purposes, each about 1 Mb. The first line is a header with the name of each site. This is followed by 17,770 lines of data.

DOWNLOAD HAYWARD FAULT CREEP DATA: hourly tab-separated text , comma-separated text, prn, space-separated text, and excel

The Temescal data shown below, with a least-squares fit and its residual, illustrates the unprecedented doubling in rate that follows local seismicity on the central Hayward fault in late 2006 and mid 2007. The rate change is pronounced at Temescal and Oakland Zoo.

Nyland Ranch, San Juan Bautista. coNR. The creepmeter is located in thick clays that each year are saturated when the water table rises. This causes the 5 mm annual cycle visible in the data. Upgraded mounts are planned. The creep rate here is high at 9 mm/yr. download coNR space delimited file 2004-2008. Three columns of data plus a header: date, slip in mm, temperature. The data logger battery died July and was replaced in October 2007 with no loss in datum.

Parkfield, South of Hwy 46 co46 [download data]. The two northern sites (coWT and coWR)have been discontinued. The downloadable space-delimited text file consist of two columns - date and time once per hour from 09/29/04 02:00 to 01/20/08 00:00, and dextral displacement in mm to three decimal places). Two creep events occurred in 2008 increasing by 3 mm the afterslip that has occurred here since the Parkfield earthquake. Rain at this site results in apparent left lateral displacements but it is my opinion that these are in fact dilatation and downhill creep of the soil near the site, and as such may be ignored in estimating post seismic creep. Afterslip events to 20 Jan 2008 sum to more than 21 mm. The fastest slip in a creep event is less than 3µm/min, and the average creep event amplitude and duration 1.6 mm in 7 days. The average creep rate here is now roughly 3.5 mm/yr.

SOUTHERN CALIFORNIA FAULT CREEP DATA

For the following instruments in southern California, each file has three columns that can be read by Excel 2007/8, but not by earlier versions due to their length. Date and time in GMT, dextral displacement in mm, and temperature in deg C. The first line is a header, and the data are sampled at five minute or ten minute intervals. The date format is :MM/DD/YY HH:MM:SS. Time is initially accurate to 1 s. The internal clock can drift by several minutes in a year, but the clock is usually synchronized 3 to 4 times each year. The files are large, so make sure you have a fast internet line before clicking on the data downloads below.

Ferrum (download) , coFE Durmid Hill (The creep-meter crosses a 5 m deep cutting into Durmid hill and its signal is the least influenced by surface hydrology. Nevertheless heavy rain causes reversals in rate. A daily thermoelastic signal is imposed on the creep signal from the expansion of the rail line above the creepmeter rod. Two creep events occur synchronously at Ferrum and Salt Creek (below), and coDU in the winter months of 2006, but less than 2 mm of creep has occurred since then. The 4 year mean creep rate is approximately 2.5 mm/yr.

SaltCreek [download] , coSC Durmid Hill (The instrument is the original Caltech creepmeter and has a stainless stell length standard whose thermal expansion is compensated by subtracting an empirical coefficient derived from the measured temperature [*6.05]. The large left lateral signal at the end is a fault zone hydrology effect. Note that the amplitudes of signals here are quite small

Durmid Hill [download] coDU ( approx 2 km SE of Bat Cave Buttes, (8 Mb) 2004 to late 2007. The site is not telemetered. Data show an annual thermoelastic signal of approximately 1 mm amplitude, with two dextral creep events in the winter of 2006 that were detected by the Durmid strainmeters. Heavy rain ponds near one end of the instrument and causes occasional left-lateral events (in January 2005 and October 2007). If the left lateral errors are ignored the creep rate averages 1 mm/year. Creep in the past year is twice this rate. The instrument can operate up to 18 months unattended from AA cells.

Superstition Hills [download] Fault. coSH. A slow1.5 mm/year creep rate has now resumed after the very unusual 27 mm amplitude creep event that occurred in November 2006. Surface cracks extended along much of the fault zone. Two smaller creep events occurred in 2005 & 2006.