Los Angeles Seismic Zone • 200 km Monitoring Radius
Real-Time Earthquakes in Los Angeles, United States
Live seismic telemetry, active fault rupture tracking, and ground motion hazard monitoring for the Los Angeles metropolitan area.
Recent Earthquakes Near Los Angeles
LIVELive telemetry feed and hypocenter reports recorded within a 200 km radius of Los Angeles.
Landmark Historical Earthquakes in Los Angeles
Significant seismic benchmarks, cataloged damage, and engineering lessons shaping modern safety standards.
Ridgecrest / China Lake
The largest earthquake in Southern California in over two decades; swayed downtown Los Angeles skyscrapers for over 30 seconds, interrupted a live Major League Baseball game at Dodger Stadium, caused localized power outages, and triggered extensive ShakeAlert testing.
Reseda / Northridge, San Fernando Valley
A blind thrust rupture that killed 57 people, injured over 8,700, collapsed freeway interchanges on I-10 and I-5, caused $40+ billion in structural damage, and revolutionized seismic steel-frame building codes worldwide.
San Fernando / Sylmar
Killed 64 people, collapsed the newly built Olive View Medical Center and Veterans Hospital, nearly breached the Van Norman Dam, and led to the passage of California’s landmark Alquist-Priolo Earthquake Fault Zoning Act.
Offshore Newport-Inglewood Fault / Long Beach
Killed 120 people and devastated unreinforced masonry school buildings throughout the LA basin, leading directly to the enactment of the Field Act mandating seismic standards for California public schools.
Seismic Geology & Soil Amplification in Los Angeles
Plate boundaries, tectonic kinematics, and local geotechnical ground response characteristics.
Greater Los Angeles sits inside an actively compressing foreland sedimentary basin created by the "Big Bend" of the San Andreas Fault. As the Pacific Plate grinds northwestward against North America, this crustal bend produces intense regional compression that drives a network of blind thrust faults directly beneath downtown Los Angeles, Hollywood, Compton, and the San Fernando Valley.
Local Soil Profile & Ground Motion Resonance
The Los Angeles sedimentary basin reaches depths of up to 10 kilometers beneath Downey and Long Beach. Seismic waves entering this deep, bowl-shaped sediment trap bounce off bedrock boundaries and amplify long-period shaking by up to 300%, causing prolonged ground oscillation in high-rise buildings.
Major Active Fault Systems Near Los Angeles
Seismogenic fault lines, maximum credible magnitudes (MCE), and proximity to the metropolitan center.
San Andreas Fault (Mojave & San Bernardino Segments)
The master transform boundary of North America, overdue for a major southern rupture (The "Big One") capable of shaking the entire Southern California basin.
Puente Hills Blind Thrust Fault
A buried, blind thrust fault extending beneath Downtown Los Angeles, East LA, and northern Orange County; USGS models identify it as America’s highest-cost natural disaster scenario.
Newport-Inglewood Fault Zone
Active urban strike-slip system traversing Baldwin Hills, Inglewood, and Long Beach; source of the deadly 1933 Long Beach earthquake.
Hollywood & Santa Monica Faults
Cuts along the base of the Santa Monica Mountains through Hollywood Boulevard, West Hollywood, Beverly Hills, and Century City.
Seismic Safety, Observatory & Building Codes
Official seismological monitoring, building construction standards, early warnings, and emergency response.
Frequently Asked Questions About Earthquakes in Los Angeles
Authoritative answers to common questions regarding seismic risks, building safety, and preparedness in Los Angeles.
How far is the San Andreas Fault from Downtown Los Angeles?▾
The San Andreas Fault runs approximately 55 km (35 miles) northeast of Downtown Los Angeles across the San Gabriel Mountains near Wrightwood and Palmdale.
What is the Puente Hills Blind Thrust Fault and why is it so dangerous?▾
The Puente Hills fault is a hidden thrust fault that does not break the ground surface, dipping directly underneath Downtown LA, Dodger Stadium, and Hollywood. Because it lies directly under millions of people and thousands of infrastructure assets, an M 7.5 rupture could cause more direct urban damage than the more distant San Andreas.
Does Los Angeles have an earthquake early warning system?▾
Yes. The USGS ShakeAlert system provides seconds to tens of seconds of advance warning via cell phone alerts (MyShake, Wireless Emergency Alerts) and automatically triggers municipal responses like slowing Metro trains and opening fire station doors before severe shaking arrives.