Earthquakes
Lake County, CA Earthquake Alert Oct. 28: 4.0 Quake Near Lake Pillsbury
Lake Pillsbury, CA – A magnitude 4.0 earthquake struck Northern California early Wednesday, Oct. 28, shaking an area north of Lake Pillsbury in Lake County and drawing attention to seismic activity in
By Sophie Caldwell · 2026-10-28T12:56:58.004Z
Lake Pillsbury, CA – A magnitude 4.0 earthquake struck Northern California early Wednesday, Oct. 28, shaking an area north of Lake Pillsbury in Lake County and drawing attention to seismic activity in the region.
According to earthquake data published by the U.S. Geological Survey and the Northern California Seismic Network, the earthquake occurred at 5:01 a.m. Pacific time Wednesday, approximately 6.2 miles north of Lake Pillsbury.
The earthquake originated at a depth of approximately 6.6 miles beneath the surface, with its epicenter located at 39.500 degrees north latitude and 122.952 degrees west longitude.
The location places the earthquake in a mountainous portion of Northern California, northwest of the Sacramento metropolitan area and north of the San Francisco Bay Area.
What Residents Should Know A magnitude 4.0 earthquake can produce noticeable shaking, particularly in communities close to the epicenter. However, the intensity experienced at any particular location depends on distance, geological conditions and building characteristics.
The USGS event information displayed an intensity level of IV, corresponding to light shaking on the Modified Mercalli Intensity Scale.
The earthquake's origin information was marked as reviewed, indicating that seismic analysts had evaluated the event data.
Aftershock Forecast Released The USGS aftershock forecast accompanying the earthquake listed a 17% probability of at least one magnitude 3 or greater aftershock within the following week.
The forecast also indicated a 2% probability of a magnitude 4 or greater aftershock, while the chances of magnitude 5 or stronger activity were listed below 1%.
These probabilities are estimates, not predictions that additional earthquakes will occur.
Residents throughout Lake County and surrounding Northern California communities can monitor updated earthquake information through the USGS earthquake monitoring system.
No confirmed damage or injury information was provided in the initial earthquake data.