A swarm of 20 earthquakes has jolted Southern California, shaking communities just miles from Los Angeles. The largest quake reached a magnitude of 3.3, and all struck within a tight two-hour window near the city of Fillmore.

VENTURA COUNTY, CA - A 3.3 magnitude quake was reported close to Ojai Tuesday morning, according to the U.S. Geological Survey.

On Monday morning, around 30 minor earthquakes erupted in a swarm near the Geysers geothermal field south of Clear Lake. The day before, seven quakes rattled Sonoma County, including a 4.0 quake. The recent uptick isn’t out of the ordinary, according to U.S. Geological Survey seismologist Susan Hough.

Major quakes in Japan and Alaska along with a spate of smaller earthquakes in California this fall make folks ask, is the Big One near?

A swarm of at least six earthquakes reaching up to magnitude 2.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports. The other quakes in the Saturday, Dec. 13, swarm ranged from magnitude 1.3 to 2.3, according to the USGS.

California's seismic risk is increasing with supershear earthquakes, which are faster and more destructive than typical earthquakes.

Residents in Nevada woke up to a shocking 5.9 magnitude earthquake alert, but after the panic settled, the whole thing turned out to be a fake quake alert sent by USGS.

The ShakeAlert system that warns about imminent shaking arriving from earthquakes sent a false alarm across California on Thursday morning for a magnitude 5.9 temblor that did not happen.

A rare, ultra-long earthquake in Myanmar revealed that mature faults can deliver their full force directly to the surface. The discovery could mean stronger shaking near faults like California’s San Andreas than current models predict.

The San Jacinto Fault, considered part of the San Andreas Fault system, has a 5% chance of magnitude 6.7 or larger earthquakes. The line begins at Cajun Pass and runs southeast through San Bernardino, Riverside County and Imperial County. Meanwhile, the Elsinore Fault, part of the same system, has a 3.8% chance of earthquakes of that size.