M1.8 earthquake 19km NE of Upper Lake, CA

A magnitude 1.8 earthquake struck 19km NE of Upper Lake, CA on Fri, Aug 13, 2021, 5:24 AM PDT (12:24 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.8 4km ENE of Talmage, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 174 in the 30 days before it.

The first 60 of 171.

From the USGS Earthquake Hazards Program and its partner networks, event nc73609571. Read Sun, Oct 4, 2026, 12:37 AM UTC.