foreshock

/fawr-shok, fohr-/US // ˈfɔrˌʃɒk, ˈfoʊr- //UK // (ˈfɔːˌʃɒk) //

前震,前震荡,前所未有的震荡,前兆

Definitions

n.名词 noun

1
Geology.
- : a relatively small earthquake that precedes a greater one by a few days or weeks and originates at or near the focus of the larger earthquake.