MICROSEISM

tremor, earth tremor, microseism

(noun) a small earthquake

Source: WordNet® 3.1

Etymology

Noun

microseism (plural microseisms)

A faint earth tremor caused by natural phenomena, such as wind.

Source: Wiktionary

Mi"cro*seism, n. [Micro- + Gr. an earthquake, fr. to shake.]

Definition: A feeble earth tremor not directly perceptible, but detected only by means of specially constructed apparatus. -- Mi`cro*seis"mic (#), *seis"mic*al (#), a.

Source: Webster’s Unabridged Dictionary 1913 Edition

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