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.

HUMBOLDT COUNTY, Calif. (KGO) -- A large earthquake struck off the coast of Petrolia, a community in Humboldt County, in Northern California USGS reports. The quake struck at 3:08 p.m. with a 5.2 ...

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 ...

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.

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.