A smaller earthquake that occurs before a larger earthquake in the same area; a warning tremor that may precede major seismic activity.
Combining 'fore-' (before) and 'shock' (a sudden tremor or impact). This seismology term emerged in the 19th century as scientists began systematically studying earthquake patterns and noticed smaller quakes often preceded larger ones.
Foreshocks are the Earth's warning system, but here's the tricky part: scientists can't reliably predict when a foreshock will become a major earthquake versus just being a standalone small quake, so people actually live in constant anxiety during foreshock sequences, not knowing if the big one is coming!
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