![]() ![]() See why it is worth it to earthquake retrofit a home in San Diego.The Elsinore and San Jacinto faults cut through East County and can also generate moderately-sized but potentially damaging earthquakes. ![]() Geologists say this is the biggest earthquake threat to San Diego, capable of earthquakes of magnitude 6.9. The Rose Canyon fault runs along the coast and beneath downtown San Diego.The San Andreas fault is the longest fault in California and can cause powerful earthquakes-as big as magnitude 8-that can still generate strong shaking levels in San Diego.Many of the mountains, and some of the valleys, in Southern California were formed by the San Andreas fault system-the tectonic boundary between the Pacific and North American tectonic plates-which runs to the east of San Diego County from the Gulf of California up through the Salton Sea and into the Los Angeles region. Like all of California, San Diego is earthquake country. ![]() What is the Earthquake Risk in San Diego? *The 76% probability of one or more magnitude 7.0 earthquakes striking Northern California is based on a 30-year period, beginning in 2014. See the USGS interactive fault map to learn more about faults in this area Landslides are possible on steep hillsides. Houses on liquefied soil may settle or even move laterally on gentle slopes.
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