Faint foreshocks foretell California quakes

Source: Science Daily

New research mining data from a catalog of more than 1.8 million southern California earthquakes found that nearly three-fourths of the time, foreshocks signalled a quake’s readiness to strike from days to weeks before the the mainshock hit, a revelation that could advance earthquake forecasting.

https://www.sciencedaily.com/releases/2019/07/190731125432.htm