An earthquake with a magnitude of 5.3 hit near the Salton Sea around 10:55 a.m. 24 miles north northwest of El Centro in Southern California. Shaking was felt across Southern California and big centers like in Los Angeles and San Diego, as well as in bordering mexican cities.
As shown in the following map, the main earthquake was followed by a series of hundreds of aftershocks.
The M5.3 earthquake hit near Calipatria, Imperial County, California, USA at a very shallow depth of 3.6 miles beneath the epicenter.
Good afternoon Southern California! Lots earthquakes today. Did you receive a #ShakeAlert-powered alert for the M 5.3 earthquake about 7 mi west of Calipatria (near the Salton Sea) at 10:55 am PT? Please share! @Cal_OES @CalConservation pic.twitter.com/IrFFV7ZCVN
— USGS ShakeAlert (@USGS_ShakeAlert) June 5, 2021
Based on the preliminary seismic data, the quake should have been widely felt by almost everyone in the area of the epicenter. USGS did you feel it map, shows that the earthquakes has been felt from in Los Angeles, San Diego and even in Phoenix, Arizona…
The Salton Buttes on the south shore of the Salton Sea are on the north margin of the Brawley Seismic Zone and are linked to volcanic and geothermal activity within the zone. This is exactly where the earthquake swarm is rattling right now!
Earthquake swarm not fully understood
The earthquake seems to have hit right on the Brawley Seismic Zone, an extensional tectonic zone that connects the southern terminus of the San Andreas Fault with the Imperial Fault in Southern California…
But geologists don’t understand completely the swarm activity of the Brawley Fault Zone even though USGS scientists say such quake series are typical for this seismic region:
“The area sees lots of events at once, with many close to the largest magnitude, rather than one main shock with several much smaller aftershocks.”
On August 26, 2012 near Brawley, a swarm of more than 300 small to moderate earthquakes occurred with the largest two reaching a maximum of M5.3 and M5.5.
In 2005, also near Brawley, there was a swarm with a peak magnitude of 5.1, while in 1981 a swarm included one quake which was measured at 5.8.
So with a M5.3 today, we are pretty close!
It is important to add that the Imperial Valley of southern California experiences high rates of seismicity with a pronounced portion of the activity occurring within the Brawley Seismic Zone that separates the San Andreas fault to the north and the Imperial fault to the south.
The Imperial fault was the source of the 1940 El Centro earthquake and the 1979 Imperial Valley earthquake, that triggered more than 30 km (19 mi) of surface rupture along the northwest trending Imperial fault from just north of the Mexico–United States border to an area south of Brawley. The Brawley Seismic Zone was found to have ruptured, with surface cracks, for a length of 13 km (8.1 mi).
Hopefully will this swarm not induce a big one along the San Andreas fault to the north and/or the Imperial fault to the south… Always be prepared!
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