Earthquake Swarm Update: USGS Downgrades Susanville Quake to 4.9 Magnitude
SUSANVILLE, Calif. — The U.S. Geological Survey (USGS) has revised the magnitude of the significant earthquake that struck near Susanville, California, on December 30, 2025, downgrading it from initial reports of 5.3 to 4.9. The event occurred at approximately 9:49 p.m. PST, with the epicenter 14 km NNW of Susanville at a depth of 5.3 km, contributing to ongoing shaking in Lassen County.
A persistent swarm of…
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