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More than 100 aftershocks follow 7.2 Mexicali earthquake

April 5, 2010 |  7:15 am

Earthquake Index Map

The 7.2 Mexicali earthquake has produced more than 100 aftershocks in the last 15 hours, including many small temblors in California.

Many of the aftershocks have occurred on the California side of the border just above the epicenter near Mexicali. Residents in Calexico and other parts of Imperial County and San Diego County reported feeling them. There have been other aftershock farther north in Riverside County, around the Salton Sea.

A 4.1 temblor struck off the coast of Malibu on Sunday afternoon.

Dozens of the aftershock measure stronger than magnitude 4.0. Two in Ocotillo, Calif., which is near the border, measured 5.0 -- including one that hit Monday at 6:33 a.m.

"This is very typical for a 7.2 earthquake." said Caltech scientist Kate Hutton.

On Sunday, Caltech officials said it was probable that the Mexicali temblor could produce an aftershock of 6.0.

Residents of Calexico in the Imperial Valley were jolted awake as a 3.1-magnitude earthquake struck at 4:12 a.m. Monday.

Lights flickered and some light poles swayed as the aftershock struck the California border town. There were no immediate reports of injuries or property damage.

The quake was centered about 34 miles south-southwest of Calexico, according to the U.S. Geological Survey.

-- Shelby Grad in Los Angeles and Tony Perry in Calexico, Calif.

Map credit: USGS