Earthquakes usually occur along fracture zones in Earth's crust, where large tectonic plates slide past one another and become locked. Stress builds up over long periods and is suddenly released in the form of an earthquake.

Earthquakes near Mendocino Triple Junction shake waters off Northern California with no tsunami or major damage.

HUMBOLDT COUNTY, CA - A 4.5 magnitude quake jolted near Petrolia on Wednesday morning, the U.S. Geological Survey reported.

A minor earthquake was reported on Monday in the Pacific Ocean near the Northern California coastline, a shaker that produced no reports of damage in an area that’s become a seismic hotspot. 5.1 quake hits Northern California,

Magnitude 4.1 earthquake hits near Las Vegas, USGS says after shallow tremor in Summerlin South.

The California Earthquake Authority (CEA) has raised the target size of its latest catastrophe bond sponsorship a second time, now seeking up to $425

An 8.2 magnitude earthquake struck near Mindanao in the Philippines, triggering tsunami warnings across the western Pacific region, including Indonesia and Taiwan.

The seismic activity has ranged from very low magnitude up to 4.7 magnitude in strength, according to the USGS data.