An earthquake rattled Southern California yesterday at 9:56 PM local time, registering in at magnitude 5.7 and interrupting a baseball game at San Diego's Petco Park.

The quake was centered five miles southeast of Ocotillo in San Diego County, but was felt as far north as Los Angeles. The rumble was accompanied more than two dozen smaller quakes that were felt yesterday, but no damage or injuries were reported. 

Earthquake experts say that the quakes are all aftershocks of the April 4, 7.2 magnitude quake that damaged the twin border towns of Calexico and Mexicali. Thomas Jordan, the director of the Southern California Earthquake Center at the University of Southern California, told the LA Times that the fault has been very active since the Easter quake and that continued activity from the earthquake swarm could be expected.

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At San Diego's Petco Park, umpires interrupted play  between the local Padres and Toronto Blue Jays in the eighth inning due to the earthquake. Several minutes passed, while the announcer called for calm.

Local media reports that baseball commentator Dick Enberg joked that the quake may have helped the Blue Jays move home plate closer to the pitcher's mound, so that the struggling Blue Jays could have an easier time throwing strikes in the 9th inning.

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Would you be prepared if an earthquake struck while you were out?  Read Alex Molina's Preparing for an Earthquake for some pointers.