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The earthquake waves travel across the whole state of California, leveling older buildings, disrupting roads and severing electric, telephone and water lines.

Engineers and social scientists used that information to estimate the effects of a hypothetical 7.8 quake that strikes the Coachella Valley.

Twelve years ago, seismologists modeled how the ground would shake on the southern San Andreas fault. CoreLogic, a business analysis service, estimated a Southern San Andreas fault rupture will cause 3.5 million homes to be at risk with $289 billion in reconstruction value.

USGS scenarios project more than 1,800 deaths, and 50,000 injuries due to a major Southern San Andreas fault earthquake. What would be the Impact of a Major Earthquake on the San Andreas Fault? Stress on the San Andreas fault causes right-lateral motion.Shear stress is acting on the opposing earthen blocks.Motion along a strike-slip fault is horizontal.These faults are formed by horizontal compression. The walls of rock move to the left relative to one another, or to the right relative to one another. Strike-slip faults are found along boundaries of tectonic plates sliding past each other.Ī strike-slip fault is a vertical fracture in the earth’s crust that creates horizontal motion, along the line of the fault. It can cause powerful earthquakes-as big as magnitude 8-that would affect high population communities in SoCal.Ī San Andreas earthquake would be classified as occurring on a strike-slip fault. The Southern San Andreas slices through Los Angeles County along the north side of the San Gabriel Mountains. The cities of Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, Daly City, Point Reyes Station and Bodega Bay rest on the San Andreas fault line. The San Andreas runs deep near and under some of California’s most populated areas. See Your Local Earthquake Risk San Andreas fault line map The two plates crisscross with dozens of active and passive earthquake faults. San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. San Diego, Los Angeles and Big Sur are on the Pacific Plate. This fault is one of the largest faults in the world, running more than 800 miles from the Salton Sea to Cape Mendocino. Since then, the North American plate has ground against the Pacific plate at a boundary called a strike-slip fault. The San Andreas fault line formed about 30 million years ago as the North American plate engulfed nearly all of the Farallon plate. When we think of the next big earthquake, we think of the San Andreas fault.