4.3 earthquake strikes near Morgan Hill

March 30, 2009 5:35:32 PM PDT
An earthquake with a preliminary magnitude of 4.3 struck Monday morning in the South Bay, about 16 miles east of San Jose, according to the U.S. Geological Survey.

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The earthquake, which was initially reported as a magnitude 4.4, happened at 10:40 a.m. and had a depth of 4 miles. The quake was centered about 11 miles north of Morgan Hill and 12 miles east of the Seven Trees area.

Jack Boatwright, a geophysicist with the U.S. Geological Survey, said the small, unmapped fault that appears to have produced the earthquake is believed to be a "splay fault" off the Calaveras Fault, which is itself a branch off the San Andreas Fault. The fault crosses the hills east of San Jose, an area that is difficult to map.

Because the new fault is not considered a major fault, experts at the USGS do not believe Monday morning's quake is a precursor to a larger temblor.

A dispatcher with the Morgan Hill Police Department described the quake as "short, but strong."

Damages have been reported in Almaden Valley. No injuries have been reported.

ABC7 viewers have reported feeling the temblor in Morgan Hill, San Jose, Los Gatos, Redwood City, Sunnyvale, San Francisco, Sausilito and Tracy.

BART trains are operating on a 5-10 minute delay as officials check facilities and equipment for damage. A Caltrain spokeswoman said the quake did not caused any delays and all trains are running on schedule.

Links:

  • ABC7 Earthquake Preparedness Guide
  • Twitter discussion on the earthquake

    Bay City News and the Associated Press contributed to this story.

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