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Harry Fielding Reid ......... .
The San Francisco Earthquake occurred on April 18, 1906. Measuring 8.3 oil the Richter scale,
this earthquake began when part of the San Andreas Fault slipped over a segment about 430
kilometres long. Approximately 700 lives were lost in this tragedy, and shaking was felt within a
30-kilometre radius of San Francisco. One result of this earthquake was the discovery of
earthquake faults or fractures in the rocks of the Earth's crust. This discovery was made by
American seismologist Harry Fielding Reid in 1911. Before his work, it had long been assumed
that faults were created by earthquakes. Reid realised that the opposite was true: pressures within
a fault, as two earth plates come together, cause quakes.