macroseism

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macroseism
macroseism Geol. (ˈmækrəʊsaɪz(ə)m) [f. macro- + seism.] A major earthquake; in mod. use (rare), any earthquake, as opposed to an imperceptible earth tremor (cf. microseism).1903 Sci. Amer. Suppl. 2 May 22855 Prof. Milne pointed out the distinction which exists between macroseisms, or large earthquak... Oxford English Dictionary
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microseism
microseism (maɪkrəʊˈsaɪz(ə)m) [f. Gr. µῑκρό-ς small + σεισµός shaking, earthquake.] A minor earthquake; in mod. use, any imperceptible disturbance of the earth's crust which is capable of being registered on a sensitive seismometer but which is not caused by an earthquake (see quots.).1887 G. H. Dar... Oxford English Dictionary
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