JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Earthquake seismogram, which occurred in the Hindu Kush Mountains, Afghanistan, on 3rd March 2002. This printout is from a seismograph, a device that detects and records movement of the ground due to earthquakes (seismic activity). The regular pulses seen are at 30 second intervals, which enables a seismic event to be timed. The graph across centre shows the initial shock, secondary shocks and a tailing-off of the event. Photographed at the recording station of the British Geological Survey at Weaver Farm, Derbyshire, England.
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