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1994 Northridge earthquake

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1994 Northridge earthquake

The 1994 Northridge earthquake affected Greater Los Angeles, California, United States, on January 17, 1994, at 04:30:55 PST. The epicenter of the moment magnitude 6.7 (Mw) blind thrust earthquake was beneath the San Fernando Valley. Lasting approximately 8 seconds and achieving a peak ground acceleration of over 1.7 g, it is the largest recorded earthquake in the area's history, slightly surpassing the Mw 6.6 1971 San Fernando earthquake. Shaking was felt as far away as San Diego, Turlock, Las Vegas, Nevada, Richfield, Utah, Phoenix, Arizona, and Ensenada, Baja California, Mexico. Fifty-seven people died and more than 9,000 were injured. In addition, property damage was estimated to be $13–50 billion, making it among the costliest natural disasters in U.S. history.

Infobox

UTC time
1994-01-17 12:30:55
ISC event
189275
USGS-ANSS
ComCat
Local date
January 17, 1994; 31 years ago (1994-01-17)
Local time
4:30:55 a.m. PST
Duration
8 seconds
Magnitude
6.7 '"`UNIQ--templatestyles-00000006-QINU`"'Mw
Depth
11.31 mi (18.20 km)
Epicenter
mw- 34°12′47″N 118°32′13″W / 34.213°N 118.537°W / 34.213; -118.537
Fault
Northridge Blind Thrust Fault
Type
Blind thrust
Areas affected
Greater Los Angeles AreaSouthern CaliforniaUnited States
Total damage
$13–50 billion
Max. intensity
MMI IX (Violent)
Peak acceleration
1.82 g
Peak velocity
170 cm/s
Casualties
57 killed 8,700 injured

Tables

· Geology › Strong ground motion
MMI
MMI
Main shock Mercalli intensities
MMI
Main shock Mercalli intensities
Locations
MMI IX (Violent)
MMI IX (Violent)
Main shock Mercalli intensities
MMI IX (Violent)
Main shock Mercalli intensities
Granada Hills, Los Angeles (I-10)Northridge, Santa Monica, Sherman Oaks
MMI VIII (Severe)
MMI VIII (Severe)
Main shock Mercalli intensities
MMI VIII (Severe)
Main shock Mercalli intensities
San Fernando, Hollywood, ResedaChatsworth, Universal City, Van Nuys
MMI VII (Very strong)
MMI VII (Very strong)
Main shock Mercalli intensities
MMI VII (Very strong)
Main shock Mercalli intensities
Agoura Hills, Beverly Hills, Burbank, Century CityGlendale, Downtown, Culver City
MMI VI (Strong)
MMI VI (Strong)
Main shock Mercalli intensities
MMI VI (Strong)
Main shock Mercalli intensities
Anaheim, Arcadia, Compton, Oxnard, Palmdale
MMI V (Moderate)
MMI V (Moderate)
Main shock Mercalli intensities
MMI V (Moderate)
Main shock Mercalli intensities
Bullhead City, Chino, Inglewood, Long Beach, Westmorland
MMI IV (Light)
MMI IV (Light)
Main shock Mercalli intensities
MMI IV (Light)
Main shock Mercalli intensities
Barstow, Calexico, El Centro, San Diego
MMI III (Weak)
MMI III (Weak)
Main shock Mercalli intensities
MMI III (Weak)
Main shock Mercalli intensities
Parker, Las Vegas, Fresno, Santa Maria
Main shock Mercalli intensities
MMI
Locations
MMI IX (Violent)
Granada Hills, Los Angeles (I-10)Northridge, Santa Monica, Sherman Oaks
MMI VIII (Severe)
San Fernando, Hollywood, ResedaChatsworth, Universal City, Van Nuys
MMI VII (Very strong)
Agoura Hills, Beverly Hills, Burbank, Century CityGlendale, Downtown, Culver City
MMI VI (Strong)
Anaheim, Arcadia, Compton, Oxnard, Palmdale
MMI V (Moderate)
Bullhead City, Chino, Inglewood, Long Beach, Westmorland
MMI IV (Light)
Barstow, Calexico, El Centro, San Diego
MMI III (Weak)
Parker, Las Vegas, Fresno, Santa Maria

References

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