A magnitude-4.0 earthquake Wednesday morning in the mountains east of Los Angeles sent a jolt through the region that could be felt throughout Southern California.
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The quake, initially reported with a magnitude of 4.5, occurred at 9:10 a.m., just southeast of Big Bear Lake in the mountains of San Bernardino County.
Weak shaking was reported in Yucaipa, Cabazon, Redlands, Loma Linda, Riverside and Palm Springs. Residents described the shaking as nothing more than a sharp jolt.
"Felt small amount of rolling then a very hard jolt in Hesperia," said NBCLA Facebook visitor Kathy Adams Bajek.
There were no immediate reports of damage or injuries, according to the San Bernardino County Fire Department.
The mountain community and surrounding desert region mark the site of one of California's largest magnitude quakes. In 1992, the magnitude-7.3 Landers earthquake led to one fatality in Yucca Valley, located in the desert southeast of Big Bear Lake. About 400 people were injured and several structures were damaged during the main seismic event.
A magnitude-6.5 aftershock caused substantial damage and landslides in the Big Bear Lake area. The quake caused shaking throughout Southern California and as far north as Boise, Idaho.
M4.5 Big Bear EQ close to San Andreas, but preliminary focal mechanism shows oblique normal faulting, not SAF type. http://t.co/gSZQl3pUjd
— Dr. Lucy Jones (@DrLucyJones) September 16, 2015