Jisho

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Noun
1. foreshockSee also 余震
Wikipedia definition
2. ForeshockA foreshock is an earthquake that occurs before a larger seismic event (the mainshock) 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.
Read “Foreshock” on English Wikipedia
Read “前震” on Japanese Wikipedia
Read “Foreshock” on DBpedia

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