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240017 * Understanding Earthquakes (Oταν η Γη έχει λόξυγκα... )

After the devastating 1906 San Francisco, California earthquake, a fault trace was discovered that could be followed along the ground in a more or less straight line for 270 miles. It was found that the earth on one side of the fault had slipped compared to the earth on the other side of the fault by up to 21 feet (7 m). This fault trace drew the curiosity of a number of scientists, especially since nobody had yet been able to explain what was happening within the earth to cause earthquakes. Up until this earthquake, it had generally been assumed that the forces leading to the occurrence of earthquakes must be close to the locations of the earthquakes themselves.

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(http://www.crustal.ucsb.edu/ics/understanding/)