California earthquakes

M1.5 earthquake 21km NNW of Tehachapi, CA

A magnitude 1.5 earthquake struck 21km NNW of Tehachapi, CA on Thu, Feb 28, 1991, 4:36 PM PST (00:36 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.7 15km NW of Fillmore, CA. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.5 (Mh), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1991-03-01 00:36:04 UTC
Depth
3.0 km (1.9 mi), shallow
Epicenter
35.310° N, 118.538° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.4 km horizontally, 0.5 km in depth
Depth from
From location
Station coverage gap
90°
Stations used
16

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 48 in the 30 days before it.

After

The first 60 of 137.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci2013468. Read Sun, Oct 4, 2026, 3:55 PM UTC.