California earthquakes

M1.6 earthquake 15 km NW of Parkfield, California

A magnitude 1.6 earthquake struck 15 km NW of Parkfield, California on Sat, Mar 31, 1990, 7:33 AM PST (15:33 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.7 16 km N of Coalinga, California. This one was a foreshock.

Coalinga forecastMore in California

Map

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

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The earthquake

Magnitude
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-03-31 15:33:32 UTC
Depth
4.9 km (3.0 mi), shallow
Epicenter
35.996° N, 120.553° 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, 0.3 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
79°
Stations used
25

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 125 in the 60 days after this one and 59 in the 30 days before it.

After

The first 60 of 125.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc155142 (also filed as ci1056409). Read Sat, Oct 3, 2026, 4:20 PM UTC.