Abstract
In an effort to answer troublesome questions about stresses on the San Andreas fault, a team of U.S. Geological Survey (USGS) researchers is compiling data from in situ measurements in the deepest hole ever drilled, for scientific purposes, on or near the San Andreas fault.Headed by Mark Zoback, the team recently finished drilling the 1‐km hole, made stress measurements, and left fault zone monitoring equipment (seismometer and water level recorder) in place. Located about 40 km south of Palmdale and 3.5 km from the fault, the hole is in a region of real concern to geologists —in the area of the swelling and deflating Palmdale Bulge and at the site of an 1857 earthquake that had an estimated Richter reading of 8.
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