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LOS ANGELES, June 10 (Xinhua) -- A shallow earthquake measuring 5.2 on the Richter scale hit Anza Borrego Desert State Park in southern California of the United States early Friday, the U.S. Geological Survey said.
The temblor struck at 1:04 a.m. local time (0804 GMT) at a depth of 1.4 km, with the epicenter about 149 km from Los Angeles. As of 2:20 a.m. (0920 GMT), there were four 3-magnitude and above aftershocks.
The quake was felt throughout southern California from San Diego to Los Angeles, and there were no immediate reports of damage, according to the Los Angeles County Fire Department.
Seismologist Lucy Jones wrote on Twitter that the earthquake occurred along the San Jacinto Fault, historically the most active fault in southern California.
"It was near a magnitude-6 earthquake in 1937 and a magnitude-5.3 earthquake in 1980," she said.
"We have never seen a San Andreas earthquake triggered by a San Jacinto earthquake," she added, referring to California's most famous fault.
