Earthquakes in Los Angeles

Los Angeles carries a high earthquake risk. The city sits atop a dense web of active faults, and the mighty San Andreas Fault runs just to the east, capable of producing a magnitude 7.8 or larger rupture that seismologists often call "the Big One." Beyond San Andreas, dozens of lesser-known faults thread directly beneath the metropolitan area, including the Newport-Inglewood, Puente Hills, and Hollywood faults. Many of these are "blind thrust" faults that give no surface warning, and the U.S. Geological Survey estimates a very high probability of a damaging quake striking Southern California within the next few decades.

Downtown Los Angeles skyline, California

Desert landscape along the San Andreas Fault near Los Angeles

Freeway overpass in Los Angeles, retrofitted after past earthquakes

Latest quakes in this area

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The region's history makes the danger concrete. The 1994 Northridge earthquake, a magnitude 6.7 event on a previously unmapped blind thrust fault, killed at least 57 people, injured thousands, and caused more than $40 billion in damage, collapsing freeway overpasses and apartment buildings. Earlier, the 1971 Sylmar (San Fernando) quake and the 1933 Long Beach earthquake also brought death and destruction, the latter reshaping California's school-construction codes. Today Los Angeles has some of the strictest seismic building standards in the world and runs the ShakeAlert early-warning system, but its aging infrastructure, hillside neighborhoods, and soft-story buildings mean residents, expats, and visitors should always be prepared for strong shaking.

Stress on the fault system is not static. A 2026 reconstruction of a millennium of earthquake history found stress on the San Andreas and San Jacinto faults at its highest level in 1,000 years, with the San Jacinto segment near San Bernardino registering its highest load since a similar peak nearly 50 years ago. The U.S. Geological Survey's UCERF3 model puts the probability of a magnitude 6.7 or larger earthquake within 100 km of Los Angeles at roughly 60% over the next 30 years, and 46% for magnitude 7.0 or larger. The single largest credible rupture for the metro area is a magnitude 7.4 event on the Newport-Inglewood Fault, which runs just 8 km from downtown.

Los Angeles residents also benefit from ShakeAlert, the USGS-backed early-warning system distributed through the MyShake app and wireless emergency alerts. As of mid-2026 the app has surpassed 4.5 million downloads and issued more than 6.8 million alerts for 194 earthquakes since launch, giving people seconds — sometimes tens of seconds — to drop, cover, and hold on before the strongest shaking arrives. It will not predict an earthquake, but it can buy critical time to stop a car, exit a hazardous machine, or shield yourself before the ground moves.

Frequently asked questions

Is Los Angeles overdue for a major earthquake?

Seismologists avoid the word "overdue" because earthquakes do not follow a fixed schedule, but stress modeling shows the San Andreas and San Jacinto faults near Los Angeles are under some of the highest recorded stress in 1,000 years, and the USGS puts the 30-year probability of a magnitude 6.7+ quake within 100 km of the city at about 60%.

What is the 'Big One' everyone talks about?

The 'Big One' refers to a potential magnitude 7.8 or larger rupture along a long stretch of the San Andreas Fault east of Los Angeles. Such an event could cause severe, widespread damage across Southern California, though it is only one of several major fault scenarios seismologists study.

Which fault is closest to downtown Los Angeles?

The Newport-Inglewood Fault and the Puente Hills blind thrust fault both run close to or beneath the city itself. The Puente Hills fault produced the deadly 1987 Whittier Narrows earthquake and lies almost entirely underground with no visible surface trace.

Does Los Angeles get earthquake warnings before they happen?

ShakeAlert, distributed via the MyShake app and wireless emergency alerts, can give residents several seconds to tens of seconds of warning after a quake begins elsewhere and before shaking reaches Los Angeles. It cannot predict earthquakes in advance.

What was the deadliest recent earthquake in Los Angeles?

The 1994 Northridge earthquake, magnitude 6.7, killed at least 57 people, injured thousands, and caused more than $40 billion in damage, making it one of the costliest natural disasters in U.S. history.

Are Los Angeles buildings earthquake-proof?

No building is fully earthquake-proof, but Los Angeles enforces some of the strictest seismic codes in the world, including a mandatory retrofit program for older 'soft-story' apartment buildings and non-ductile concrete structures identified as high risk.

What should I do during an earthquake in Los Angeles?

Drop to the ground, take cover under sturdy furniture, and hold on until the shaking stops. Stay away from windows and exterior walls, and if you are outdoors, move away from buildings, trees, and power lines.

How often does Los Angeles actually feel earthquakes?

Southern California records thousands of small earthquakes every year, most too weak to notice. Los Angeles residents typically feel a handful of light-to-moderate quakes annually, with damaging events being far rarer.