Parkfield earthquake prediction: VIBROSEIS truck

Parkfield earthquake prediction: VIBROSEIS truck

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Credit: DAVID PARKER/SCIENCE PHOTO LIBRARY

Caption: Parkfield earthquake prediction experiment. Dr Richard Clymer operates a VIBROSEIS truck. It produces artificial S (shear) waves of a precise frequency which can be used to probe the underlying rock structures in a manner similar to sonar. The vibrations from the 26 tonne truck are transmitted to the ground via a baseplate (visible between the wheels). The returning signals are picked up by a nearby network of 10 seismometers. 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.

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Keywords: earthquake, earthquake prediction, earthquakes, parkfield, parkfield quake experiment, san andreas fault, seismology, vibroseis truck

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