coDU

33.4147 deg N

115.7985 deg W

The creepmeter was operated for about 5 years intermittently in the 1990's providing valuable information for the timing of triggered slip in the Landers and Joshua Tree earthquakes. The instruments then used RS100 Radioshack computers to record the data requiring frequent battery replacements.

The site was refurbished in 2004 using an onset microstation with a switched LVDT. Four AA batteries operate the site for a year.

Numeric data may be downloaded here.

coDU, Durmid Hill

View North towards BatCave Buttes on Durmid Hill near creep meter. The creep-meter has operated continuously since 2004. Its data are retrieved manually.

Data

The above plot shows unededited data 2004 to Feb 2011. Prior to the triggered slip episode in April 2010 the San Andreas fault was slipping here at 1.4-1/8 mm/yr. Creep events and triggered slip cumulatively account for 12.5 mm of slip prior to 2011.Click on figure for enlarged view.

The raw data are offset at times of heavy rain (R). These offsets have been removed by eye (their pre-precipitation trend is used to judge the point of recovery a few months later). This reveals a back-ground creep rate of 1.8 mm/yr 2004-2008 increasing to 2.6-2.9 mm/year. Small double creep events occurred in 2006 and 2008: triggered slip occurred twice in 2009 and in the El Major earthquake of 2010