[Updated at 10:48 p.m.]Â The quake was the largest in the Baja California and Southern California area since 1992, the USGS reported.
The '92 quake, which struck in Landers, California, triggered an earthquake the next day in Nevada and another quake 11 days later in Southern California, according to USGS seismologist Lucy Jones. Both were 5.7-magnitude quakes.
[Updated at 10:30 p.m.]Â The USGS has a feature on its Web site where you can respond if you felt the quake. Thus far, there are hundreds of responses with peopleÂ claiming to have experienced the earthquake, representing areas in California and Mexico, to Arizona and Nevada.
Meanwhile, Twitter has thousands of posts about the quake. Posts â at different times â are trending under several topics, including: âUSGS,â âEarthquake,â âMexico,â Mexicaliâ and âBaja California.â
Some are weighing in with their first brushes with an earthquake; others are posting about some of the quakeâs effects, such as people they know getting trapped in elevators.
There is even a bit of wry humor. A poster with the name jfranke24 wrote: âEarthquake rumbles through SoCal while we're eating dinner next to the Staples Cntr. You know you're in LA when everybody claps afterwards.âÂ
[Updated at 10:00 p.m.]Â CNN's Ted Rowlands reports from Los Angeles, California:
[Updated at 9:40 p.m.]Â At least one person has been confirmed killed in a building collapse in Mexicali, according to the assistant director of civil protection in Tijuana. There have also been reports of injuries and structural damage, according to Alfredo Escobedo, Mexico's director of civil protection.
Pictures from Mexicali showed the sides ripped off buildings, toppledÂ telephone poles, cracked roads, and supermarket aisles strewn with food thatÂ had fallen off shelves.Â In California and Arizona, there were no immediate reports of injuries and only limited reports of damages. Residents across southern California and Arizona reported serious groundÂ shakes.
[Updated at 9:33 p.m.]Â During a press conference earlier this evening, Lucy Jones, a seismologist with the USGS, said someÂ magnitude 5 or magnitude 6 aftershocks were possible during the next few days.
[Updated at 8:52 p.m.]Â There have been three large aftershocks so far, including one that registered a 5.5 magnitude, and other smaller temblors, USGS said.
A magnitude 6.9 earthquake struck Baja California innorthwestern Mexico on Sunday, shaking the ground at least as far as Los Angeles, California, the U.S. Geological Survey and witnesses reported.
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