Most of California’s Big Earthquakes Are Preceded by Ghostly ‘Foreshocks’ Weeks in Advance — Livescience.com

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Foreshocks — the tiny, sometimes imperceptible tremors that precede massive earthquakes — are way more common than we thought.

über Most of California’s Big Earthquakes Are Preceded by Ghostly ‘Foreshocks’ Weeks in Advance — Livescience.com