Temescal Park Site map and cross-section

The mean creep rate at Temescal Park in the past decade can be interpreted as 3.24 mm/year interrupted by several-month periods of increased slip in early 1998 and 2007 that have added 1.5 and 2.1 mm respectively. Alternatively, if these increments are included in the mean creep rate, the mean rate for the past decade is 3.48 mm/yr, similar to the rate 2004-2006 shown below.

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.