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August Gallery

Choose from 16 pictures in our August collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

David Speedie Featured August Print

David Speedie

David Speedie, Coventry City

© EMPICS Sport

Parkfield earthquake prediction: VIBROSEIS truck Featured August Print

Parkfield earthquake prediction: VIBROSEIS truck

Parkfield earthquake prediction experiment. Dr Richard Clymer operates a VIBROSEIS truck. It produces artificials (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