Preliminary Tremors
Preliminary Tremors : In early seismological studies, the term was used for the small motions at the start of an earthquake record. For local earthquakes, this corresponds to the waves arriving between the (in modern terms) first P and main S arrival. Omori found that its duration is proportional to the epicentral distance with the coefficient of about 8 km/sec. See Chapter 1 in this Maqnual, and the biography of Fusakichi Omori in Howell (2003)
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