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Magnitude 3 earthquake hits Malibu, one of several California temblors after 7.2 shaker near Mexicali [Updated]

April 4, 2010 |  5:29 pm

A magnitude 3 earthquake struck the Santa Monica Bay this afternoon, a short time after a magnitude 7.2 temblor struck Mexicali.

[Updated, 5:36 p.m.: Caltech seismologists upgraded the Santa Monica quake to magnitude 4.1 and said it's connected to the Mexicali temblor.]

The bay quake occurred about six miles south of Malibu around 4:10 p.m. There were no reports of damage or injuries.

Since the Mexicali quake, there have been other temblors around California, including several in Northern California and one in Julian, a backcountry town in San Diego County. There have also been aftershocks of the Mexicali quake centered in Mexico.

The part of Baja California struck today has experienced regular seismic activity -- mostly small quakes but also some strong ones. Guadalupe Victoria has recorded numerous minor quakes in the last few weeks.

Caltech seismologists were still studying the details of the temblor, trying to connect it to a specific fault. They said it's possible that the quake was so large that it ruptured all the way into California.

[Correction: An earlier version of this post incorrectly stated that the Malibu quake occurred two hours after the Mexicali quake.]

Instrumental Intensity Image

-- Shelby Grad

Map: USGS Quake intensity analysis.

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