Temescal Park Site map and cross-section

The creep rate here for the past 12 years has been approximately linear at 3.3 mm/yr with a 1 mm seasonal signal.[see image jpg, or image pdf]. Three accelerated events occur in the data with amplitudes 1, 2 an 4 mm. The last two are associated with local seismicity in the Alameda/Berkeley region. The primary data are transmitted by a Sutron DCP, but an independent data logger was installed in July 2004 to circumvent loss of data due to telemetry failures. This data logger has occasionally sampled at 5 minute intervals, ten minute intervals and, since 2008, at 15 minute intervals.

All data from 6 March 1997 to 1 October 2009 can be downloaded below. For more recent data go to datagarrison.com user geo, password hobo. FORMAT. The data are in two columns with a one line header labelled temescalday [date in excel format (MM/DD/YY hh:mm:ss)], amd temescalcumulative [dextral slip in mm to four decimal places of which only two are significant]. The starting value is arbitrary. There are 227707 rows and the unpacked .csv file is 6Mb. The zip file is 800kb.

1. All data 1997-2009 . Time tagged variable spaced data. A .csv zipped file. The data are listed with time tags that vary in time interval from 10 minutes to 1 hour.

2. All data - Hourly data (Equally spaced data at hourly intervals - a comma-separated zipped file.

3. All data - Ten-minute samples interpolated from raw 15 minute, 10 minute and 5 minute samples -- a comma-separated zipped file.

The mean creep rate at Temescal Park in the past decade can be interpreted as 3.3 mm/year interrupted by several-month periods of accelerated slip. Alternatively, if these increments are included in the mean creep rate, the mean rate for the past decade is 3.5 mm/yr, similar to the rate 2004-2006 shown below.

THE INFORMATION BELOW IS UNLIKELY TO BE OF INTEREST TO MOST READERS BUT IS RETAINED FOR HISTORICAL COMPLETENESS

The residual shows a seasonal rate change with ≈1 mm amplitude approximately 75% of which can be attributed to direct thermal expansion of the 30 m long invar rod. The plot below compares differential expansion of a steel jacket surrounding the invar with the invar which can be used to reduce the thermal noise to approximately 0.2 mm/year.Data March 1997-June 2007 can be downloaded here as a two column 3.2 Mb space-delimited text file. The first column indicates date and GMT time (MM/DD/YY HH:MM:SS and the second column dextral slip in mm (only the first two decimal places are meaningful)).

The mean creep rate at Temescal Park 2004-2006 was 3.48 mm/yr. A telemetry failure occurred in early 2006 (green) with no loss of datum. Hourly data can be dowloaded here.