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Earthquake research: USGS Geophysicist Bill Joyner

Earthquake research: USGS Geophysicist Bill Joyner

E375/0038

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Credit

PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY

Caption

Earthquake research: Geophysicist Bill Joyner sits in front of seismographic recording equipment at the U.S. Geological Survey's laboratory at Menlo Park, California. USGS seismologists have predicted that an earthquake of around magnitude 6 will occur on the San Andreas fault at Parkfield, California, before 1993. Dozens of researchers have made the village the most heavily instrumented earthquake region in the world. Data from various instruments is analysed to determine the probability of a quake within 72 hours. These include seismometers, devices which measure the vibration associated with a quake & provide a measure of its magnitude.

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