Two maps of revised Earthquake Fault Zones have been prepared for the Rose Canyon Fault where it comes onshore on Coronado Island and traverses the San Diego area to the northwest and goes back offshore near La Jolla.
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SAN DIEGO (KUSI) – In honor of Earthquake Preparedness Month in California, San Diego County’s Office of Emergency Services reminded residents today not to get caught off guard and have a plan for how to protect themselves in the event of an earthquake.
The announcement followed a magnitude 3.5 earthquake that struck Borrego Springs early Wednesday and caused light shaking to be felt across the San Diego region.
The temblor struck shortly after 3:50 a.m. roughly 6.4 miles south of Borrego Springs, at a depth of about 4.3 miles, according to a computer-generated report from the U.S. Geological Survey.
Reports on the USGS “Did You Feel It?” map showed light shaking could be felt across San Diego County, including in Poway, San Diego, Spring Valley, Lemon Grove, El Cajon, Alpine and Jamul.
San Diego County is home to three major active faults: the Rose Canyon Fault which runs along the coast, through downtown, Old Town and La Jolla and the San Jacinto and Elsinore faults, which run through the northern and eastern areas of the county.
Significant earthquakes along these faults could disrupt roadways, transportation, and services like water, gas and phone communication for weeks or months. Coastal areas are also at risk for tsunamis.
As part of the state s 2021 Don t Get Caught Off Guard campaign, county and state Office of Emergency Services officials are encouraging residents to update their emergency plan, register for local emergency alerts, and download an earthquake early warning app.
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In the mid-1980s, an earthquake brought a temporary halt to an afternoon meeting of the San Diego City Council. As soon as the chambers occupying the top floors of City Hall stopped shaking, council member Bill Cleator bolted from his seat.
He soon returned, explaining he rushed to a window just outside the room to see if the nearly completed Horton Plaza shopping mall was still standing and, he was was happy to report, it was.
Earthquakes aren’t rare in San Diego, though in modern history major ones tend to happen to the north and east. The San Andreas Fault is known around the world; not so with the Rose Canyon Fault.