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microearthquake

[mahy-kroh-urth-kweyk] /ˌmaɪ kroʊˈɜrθˌkweɪk/
noun
1.
an earthquake of very low intensity (magnitude of 2 or less on the Richter scale).
Also called microtremor.
Origin
1965-1970
1965-70; micro- + earthquake
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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