DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Parkfield earthquake prediction experiment. A U.S. Geological Survey field technician checks on equipment installed in one of the 18 water wells located around Parkfield. Seismologists have predicted that an earthquake of around magnitude 6 will occur on the San Andreas fault at Parkfield before 1993. Dozens of researchers have made the village the most heavily instrumented earthquake region in the world. Instruments in the wells record the level of ground water as the rock beneath reacts to the strains associated with seismic activity. The antenna, at top, transmits data to a satellite for relay to the Parkfield Experiment headquarters.
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