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- Dictionaryforeshock/ˈfɔːʃɒk/
noun
- 1. a mild tremor preceding the violent shaking movement of an earthquake: "a foreshock had been reported before the 1966 earthquake"
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noun
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Earthquake that occurs before the larger mainshock, and is related to the latter in both time and space
A 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 full sequence of events has happened. Wikipedia