Cobb, California — A series of shallow earthquakes, including a magnitude 3.7, struck near Cobb on Sunday morning, briefly shaking areas along Highway 175 in northern Lake County.
According to the California Integrated Seismic Network and the U.S. Geological Survey, the strongest quake measured magnitude 3.7 and occurred at 11:17 a.m. PST Saturday, approximately 8 kilometers west-northwest of Cobb. The earthquake originated at a shallow depth of about 1.6 kilometers, increasing the likelihood of noticeable ground shaking.
The magnitude 3.7 event was part of a short earthquake sequence. A smaller magnitude 2.5 quake struck at nearly the same location seconds earlier, followed by a magnitude 3.2 earthquake roughly eight minutes later. All three earthquakes occurred within 9 kilometers of Cobb, west-northwest of town and near the Highway 175 corridor.
USGS community intensity reports indicate shaking levels reached up to Modified Mercalli Intensity V, which is considered moderate shaking and can cause rattling of windows, dishes, and light objects. Several residents submitted “Did You Feel It?” reports, though no injuries or structural damage were immediately reported by authorities.
Seismologists noted that the Cobb area lies near The Geysers geothermal field, a region known for frequent low-magnitude seismic activity. Earthquakes in this area are common and are typically shallow, which can make even moderate events more noticeable to people nearby.
The shaking may have been felt by drivers on Highway 175, as well as residents in Cobb, Anderson Springs, and surrounding rural communities. Local officials did not report any roadway damage or closures following the quakes.
Officials continue to monitor the area for additional aftershocks. Residents are encouraged to report shaking experiences to the USGS to help improve earthquake intensity mapping and response planning.
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