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Vinony

foreshock

noun

  1. minor tremor preceding larger earthquake
L1413266 on Wikidata ↗

Wiktionary

noun

Etymology: Etymology tree English fore- English shock English foreshock From fore- + shock.

  1. A small earth tremor which precedes the mainshock in an earthquake sequence.
  2. Any shock or disturbance that precedes an event

    “The FY 1981 increases in defense — something of a "foreshock" to the rapid rise in defense spending over the next several years — were prompted by the fall of the Shah in Iran and the Soviet invasion of Afghanistan.”