difference between foreshok of and before shock
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A fore-shock is an earthquake that occurs before a larger seismic event (the main-shock) and is related to it in both time and space. The designation of an earthquake as fore-shock, main-shock or aftershock is only possible after the full sequence of events has happened.
Foreshocks are earthquakes that precede larger earthquakes in the same location. An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.
Aftershocks are smaller earthquakes that occur in the same general area during the days to years following a larger event or "main-shock." They occur within 1-2 fault lengths away and during the period of time before the background seismic level has resumed. As a general rule, aftershocks represent minor readjustments along the portion of a fault that slipped at the time of the main-shock. The frequency of these aftershocks decreases with time. Historically, deep earthquakes (>30 km) are much less likely to be followed by aftershocks than shallow earthquakes.
Foreshocks are earthquakes that precede larger earthquakes in the same location. An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.
Aftershocks are smaller earthquakes that occur in the same general area during the days to years following a larger event or "main-shock." They occur within 1-2 fault lengths away and during the period of time before the background seismic level has resumed. As a general rule, aftershocks represent minor readjustments along the portion of a fault that slipped at the time of the main-shock. The frequency of these aftershocks decreases with time. Historically, deep earthquakes (>30 km) are much less likely to be followed by aftershocks than shallow earthquakes.
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