Posted April 4, 2010, 11:41 PM.

The quake struck at 3:40pm about 37 miles south-southeast of Mexicali. It was reportedly the strongest temblor felt in the Southern California region since the 7.1 magnitude Hector Mine quake in the Mohave Desert in 1999.

There were no reports of damage in the Western Riverside or Northern San Diego counties, although there was damage in El Centro and Calexico in Imperial County.

Numerous aftershocks followed the quake, some in the magitude 5 range, and were also widely felt.

The earthquake was not on the San Andreas fault, but probably along the Laguna Salada fault, according to an L.A. Times story.

More on damage from the temblor and local reaction can be read at SWRNN.