FORESHOCK

Foreshock

A foreshock is an earthquake that occurs before a larger seismic event and is related to it in both time and space. The designation of an earthquake as foreshock, mainshock or aftershock is only possible after the event.

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foreshock

Noun

  1. A small earth tremor which precedes the mainshock in an earthquake sequence. Not all mainshocks have foreshocks.


The above text is a snippet from Wiktionary: foreshock
and as such is available under the Creative Commons Attribution/Share-Alike License.

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