MELBOURNE, AUSTRALIA - SEPTEMBER 22: Damaged buildings (Betty's Burgers) following an earthquake are seen along Chapel Street  on September 22, 2021 in Melbourne, Australia. A magnitude 6.0 earthquake has been felt across south-east Australia. The epicentre of the quake was near Mansfield, Victoria with tremors felt as far away as Canberra, Sydney and Tasmania. (Photo by Asanka Ratnayake/Getty Images)
5 things you should know about earthquakes
01:35 - Source: CNN
CNN  — 

A swarm of small earthquakes hit Southern California’s Imperial Valley on Wednesday afternoon, according to the United States Geological Survey (USGS).

Dozens of small earthquakes ranging from 2.5 to 4.9 magnitude happened around 4 p.m. Wednesday near the city of Westmorland, southeast of the Salton Sea. Westmorland is in Imperial Valley, near the California-Mexico border.

imperial valley earthquakes map

At least 45 quakes occurred in the area within 2 1/2 hours, seismologist Lucy Jones said in a tweet. Wednesday’s swarm is “one of the largest swarms we have had in the Imperial Valley – and it is historically the most active swarms in SoCal,” Jones said.

Swarms near Imperial County are normal, but this was one of the largest the region has seen, according to Jones. The faults near the Imperial Valley, which is historically the most active for swarms in Southern California, are small and have no impact on San Diego, Los Angeles or San Francisco.

“In other words, there is no scientific reason to predict a big quake in another location today,” she said.

None of the quakes happened anywhere near the San Andreas fault but instead in the Brawley Seismic Zone, a common source of swarms, she explained.