Massive Swarm Of Quakes Shake Healdsburg, NorCal: Did You Feel It?

HEALDSBURG, CA — Seismic waves rippled through northwest Sonoma County from just past midnight into late morning today, as a swarm of earthquakes shook nearby communities, stacking up a string of jolts that escalated, faded, and returned across shifting fault lines.

A morning tremor just outside of Healdsburg was one in a series of more than a dozen earthquakes shaking Sonoma County since midnight, according to the United States Geological Survey.

The cluster of earthquakes rattled hills northwest of the Geysers between early morning and late morning, with repeated jolts striking shallow faults and spreading toward Cobb and Healdsburg.

The quakes ranged from under 1.0 to 2.0 magnitude today.

On Sunday, a near-2.4 magnitude earthquake struck near the Geysers along with smaller ones.

Earthquake swarm timeline

• 10:40 a.m. — Magnitude 2.02 — 5 mi northwest of The Geysers
• 9:10 a.m. — Magnitude 1.06 — 0.6 mi west-northwest of The Geysers
• 8:36 a.m. — Magnitude 1.32 — 3.7 mi west-northwest of The Geysers
• 7:03 a.m. — Magnitude 1.21 — 4.4 mi north-northwest of Healdsburg
• 6:21 a.m. — Magnitude 1.09 — 4.4 mi northwest of The Geysers
• 5:57 a.m. — Magnitude 1.08 — 5 mi northwest of The Geysers
• 5:45 a.m. — Magnitude 1.04 — 5.6 mi northwest of The Geysers
• 5:40 a.m. — Magnitude 1.21 — 0.6 mi west of The Geysers
• 5:28 a.m. — Magnitude 1.35 — 4.4 mi west of Cobb
• 3:23 a.m. — Magnitude 1.26 — 3.7 mi west-northwest of Cobb
• 2:43 a.m. — Magnitude 1.05 — 2.5 mi north-northwest of The Geysers
• 1:34 a.m. — Magnitude 1.07 — 1.9 mi north-northwest of The Geysers
• 12:29 a.m. — Magnitude 1.56 — 5 mi northwest of The Geysers

May 10, 2026

• 11:06 p.m. — Magnitude 1.09 — 2.5 mi west of Cobb
• 9:37 p.m. — Magnitude 1.34 — 5 mi northwest of The Geysers
• 3:21 p.m. — Magnitude 1.11 — 4.4 mi northwest of The Geysers
• 1:43 p.m. — Magnitude 1.08 — 0.6 mi northeast of The Geysers
• 1:23 p.m. — Magnitude 1.29 — 1.2 mi northeast of The Geysers
• 1:00 p.m. — Magnitude 2.36 — 5.6 mi west-northwest of The Geysers
• 12:42 p.m. — Magnitude 1.09 — 2.5 mi west of Cobb