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Short-term variations in seismic hazard.


Accurate forecasting of short term seismic hazard has not progressed as rapidly as forecasting of other natural hazards such as severe weather, solar storms, tsunamis and volcanic eruptions. Part of the reason for this is that until recently, little useful statistical work has been done on triggering causes of earthquakes beyond studies on the gradual accumulation of strain through plate tectonic motions. The Landers earthquake in southern California on June 28, 1992, which apparently triggered seismicity throughout one million square kilometers of the western United States, provided incentive into further studies relating to the triggering of earthquakes by external causes.