foreshock

[fawr-shok, fohr-]

Phonetic (Standard)IPA

noun

Geology.

a relatively small earthquake that precedes a greater one by a few days or weeks and originates at or near the focus of the larger earthquake.

foreshock

/ ˈ��ɔːˌʃɒ�� /

a relatively small earthquake heralding the arrival of a much larger one. Some large earthquakes are preceded by a series of foreshocks Compare aftershock

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First recorded in 1900–05; fore- + shock ¹

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Examples have not been reviewed.

But she added that people were nervous about whether the quake "was a foreshock itself" and the "real one is on its way".

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Experts also do not know whether this chain of quakes are foreshocks leading up to a large earthquake or their own event.

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Indeed, only about 5% of earthquakes are "foreshocks", say Bradley and Hubbard.

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As with all earthquakes, there is 1 in 20 chance that Tuesday’s temblor was a foreshock to a larger earthquake.

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A foreshock to Thursday’s quakes occurred Wednesday, at 1:46 p.m.

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