August Gallery
Available as Framed Prints, Photos, Wall Art and Gift Items
Choose from 13 pictures in our August collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.
Abstract
Aerial
Africa
Animals
Architecture
Arts
Asia
Europe
Historic
Humour
Maps and Charts
North America
Oceania
People
Popular Themes
Posters
Religion
Science
Services
South America
Special Days
Sport
Transportation
All Images
> 1990
>> April
>> August
>> December
>> February
>> January
>> July
>> June
>> May
>> November
>> October
>> September
Collections

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
© DAVID PARKER/SCIENCE PHOTO LIBRARY