California Faces String of Earthquakes; Experts Warn of Potential ‘Big One’

California, USA — In the span of less than 12 hours, California experienced four earthquakes, starting with a 3.5 magnitude tremor near Little Lake at 9 PM ET. The latest seismic event, a 2.8 magnitude quake, was detected at approximately 4:30 AM near Petrolia, according to the U.S. Geological Survey (USGS).

No injuries or major damages have been reported following these tremors. An assessment from Michigan Tech University noted that earthquakes with magnitudes of 2.5 or lower typically go unnoticed, while those between 2.5 and 5.4 are often felt but lead to minimal damage.

All recent earthquakes occurred along the San Andreas Fault, which extends over 800 miles through California. Seismologists express concern that the fault is overdue for a significant seismic event — often dubbed ‘The Big One,’ which is defined as a magnitude 8 or higher quake. According to the Great California ShakeOut, more than 39 million residents in the state could feel the impacts of such an earthquake.

The last two major earthquakes on the San Andreas Fault were recorded in 1857 and 1906, both registering 7.9 magnitudes. The Fort Tejon earthquake in 1857 caused considerable destruction, leading to ground fissures in multiple rivers and resulted in two fatalities. The catastrophic San Francisco earthquake of 1906, similarly powerful, also led to widespread devastation.

Despite the recent uptick in seismic activity, California remains a seismically active region, with over 11,000 earthquakes reported this year alone, including nine significant tremors exceeding a magnitude of 2.0. Most earthquakes arise due to the shifting of tectonic plates — massive rock slabs that cover the Earth’s surface. As these plates gradually move against one another, they sometimes get stuck due to friction, resulting in a buildup of stress. Once that stress surpasses the friction holding the plates together, they can slip, leading to an earthquake.

Currently, experts continue to monitor the San Andreas Fault closely, keeping public safety as the top priority. While minor quakes are commonplace, seismologists emphasize the importance of readiness for a potential large-scale event. Geophysicist Thorne Monks with USGS noted, ‘These smaller quakes serve as reminders of the fault’s activity, and preparation is crucial, even when no damage is reported.’

The last major earthquake recorded before these recent events took place in 1906. Residents are encouraged to stay informed about emergency measures, and practice drills that could enhance their preparedness for significant seismic events.