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micro-earthquake
micro-earthquake n.
Brit. 
/ˌmʌɪkrəʊˈəːθkweɪk/
, /ˌmʌɪkrəʊˈəːθkweɪk/U.S. /ˌmaɪkroʊˈərθˌkweɪk/
/ˌmaɪkroʊˈərθˌkweɪk/ΚΠ
1967 N.Y. Times 23 May 29 Before a volcano erupts it generates micro-earthquakes, which we are able to detect on our seismographs.
1992 J. Hamilton-Paterson Seven-tenths i. i. 13 A Russian geologist..recently made seismograms of micro-earthquakes under the Tyrrhenian Sea.
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