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Epicenter 9.3 miles northwest of Lake Pillsbury, CA
Shakemap
State resource
The MyShake App is a free resource from CalOES that can give Californians a few moments’ warning before an earthquake’s shaking. Find it on the Apple App Store or Google Play Store. Learn more here.
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About the data
The Quake Tracker displays quakes from the past 30 days with magnitudes above 3.0 in Northern California, 4.0 in Southern California, 5.0 in the United States, and 7.0 anywhere in the world. Quakes below magnitude 3.0 are often not felt and do not appear on this map.
Intensity contours show how strongly a quake was felt and are displayed on the Quake Tracker when available. Rather than a gauge of pure shaking, intensity takes into account the effects on people and damage to infrastructure. The measure is designated using Roman numerals.
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.
Sylmar earthquake 50 years later: Destructive temblor marked turning point in the science of quakes
Sylmar earthquake marked turning point in the science of quakes
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Tuesday marks 50 years since the 1971 Sylmar-San Fernando earthquake unleashed its fury on Los Angeles just after 6 a.m. The seismic waves began their destructive path seven miles beneath the earth s surface, then traveled up at an angle and burst through the ground along a 12.5 mile stretch of the northern San Fernando Valley. The 1971 quake woke California up to the real earthquake hazard that it had in its own backyard, says Brian Olson of the California Geological Survey. It exposed a lot of problems, it exposed a lot of weaknesses.