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Figure 1. Setting of the 2004 M 6.0 Parkfield, California, earthquake and the
Parkfield Earthquake Prediction Experiment. (a) Map view of Parkfield’s
location between contrasting zones of fault behavior along the San Andreas fault
(SAF) in California. To the northwest of Parkfield the SAF slips in creep and
small earthquakes and to the southeast the SAF last slipped in the 1857 M
7.9 Fort Tejon earthquake. The grayscale hill shading over a 90-m Digital
Elevation Map (DEM) is overlain by historic surface traces of the SAF
(Jennings, 1977) (thin black
line), the 2004 Parkfield rupture trace
(Rymer et al., 2006)
(thick black line), the 1966 and 2004 mainshock epicenters, and important
geographic features (modified from
Toké and Arrowsmith, 2006).
(b) Scientific instrumentation deployed in the Parkfield region during the
Parkfield Earthquake Prediction Experiment. UPSAR, USGS Parkfield
Dense Seismograph Array
(Fletcher et al., 2006);
GEOS, General Earthquake Observation System
(Borcherdt et al., 2006),
2-color EDM, two-color Electronic Distance Meter, a laser geodetic network
(Langbein et al., 2006).
UCB HRSN, University of California, Berkeley High Resolution Seismic Network.
SAFOD, deep borehole observatory (see
http://earthscope.org/safod
and Hickman et al. [2004]). Figure courtesy of Parkfield
Chief Scientist, John Langbein.
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