A major earthquake warning has been issued to southern California after a succession of over 300 earthquakes above magnitude 4.0 were reported along the San Andrea’s fault line.
An Earthquake Advisory warning says a major quake is likely to occur anytime between now and Tuesday 4 October.
Residents and officials in Ventura, San Diego, San Bernardino, Riverside, Orange, Los Angeles, Kern and Imperial counties have been told to take all necessary precautions for a major earthquake to strike.
More than 140 seismic events have been recorded near Bombay Beach beginning Monday ranging from magnitude 1.4 to 4.3, according to U.S. Geological Services (USGS) seismologists.
A graphic illustrating a swarm of earthquakes in the Brawley seismic zone as of Monday evening. (courtesy USGS)
“California is earthquake country. We must always be prepared and not let our guard down,” said OES Director Mark Ghilarducci. “The threat of an earthquake on the San Andreas Fault hasn’t gone away, so this is another important opportunity for us to revisit our emergency plans and learn what steps you need to take if a significant earthquake hits.”
The swarm occurred in a region known as the Brawley seismic zone, which is located near a fault network that connects the southernmost end of the San Andreas fault with the Imperial fault.
Scientists say some of the cross-faults are positioned to potentially add stress to the San Andreas fault and the San Jacinto fault system when they rupture.
According to the USGS, preliminary data indicated a roughly one percent chance of a magnitude 7 or greater earthquake being triggered on the Southern San Andreas fault within the next seven days “with the likelihood decreasing over time.”
But in a tweet posted on Friday, seismologist Dr. Lucy Jones said the swarm “is over & increased risk mostly gone”.
— Dr. Lucy Jones (@DrLucyJones) September 30, 2016
The most recent quake in the swarm above magnitude 2.4 was a magnitude 3.2 temblor that struck around 11 a.m. Thursday.
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