fore-shockn.
/ˈfɔːʃɒk/, U.S. /ˈfɔrˌʃɑk/ Seismology.
A lesser shock preceding the principal shock of an earthquake.
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the world > the earth > structure of the earth > formation of features > convulsion > [noun] > earthquake > shock > lesser shock
aftershock1755
fore-shock1902
1902 Q. Jrnl. Geol. Soc. 58 393 (heading) Fore~shocks of 1901.
1959 Times 3 Jan. 4/1 It is not uncommon to have a preliminary or ‘foreshock’ followed by the main shock.
1970 Nature 18 July 317/2 Small local foreshocks and aftershocks which often precede and follow larger earthquakes.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).
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n.1902