A preliminary 2.3 magnitude quake was detected near Petrolia Saturday afternoon, according to the U.S. Geological Survey.

HUMBOLDT COUNTY, CA - According to the U.S. Geological Survey, a preliminary 2.7 magnitude quake rattled close to Petrolia ...

The recent earthquake is a reminder of the seismic volatility that characterizes the area near Eureka. The quake occurred in the vicinity of the Mendocino Triple Junction, a highly active seismic zone ...

The three magnitude-3 quakes near Petrolia took place near the northern portion of the infamous San Andreas fault, a major fracture in the Earth's crust that spans 800 miles up and down California.

On Monday afternoon, a minor offshore earthquake measuring 2.8 magnitude struck 76 kilometers west-northwest of Petrolia, California. This tremor, occurring at 10:24 a.m. PDT (17:24 UTC), was recorded ...

Multiple earthquakes shook Southern California hours after a tremor was felt on the East Coast on Aug. 5, according to data from the U.S. Geological Survey.

Petrolia is about a 250-mile drive northwest from San Francisco. What to know about earthquakes Magnitude measures the energy released at the source of the earthquake, the U.S. Geological Survey says.

Petrolia is about a 250-mile drive northwest from San Francisco. What to know about earthquakes Magnitude measures the energy released at the source of the earthquake, the U.S. Geological Survey says.

EUREKA, Calif. (KGO) -- A preliminary magnitude 4.8 earthquake struck near the Northern California coast on Saturday, according to the United States Geological Survey.