California earthquakes

M2.3 earthquake 5km SSE of Parkfield, CA

A magnitude 2.3 earthquake struck 5km SSE of Parkfield, CA on Wed, Sep 15, 2021, 5:51 AM PDT (12:51 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.7 18km NW of San Simeon, CA. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
2.3 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-09-15 12:51:06 UTC
Depth
5.5 km (3.4 mi), shallow
Epicenter
35.860° N, 120.404° 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 0.2 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
78°
Stations used
54

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 78 in the 60 days after this one and 31 in the 30 days before it.

After

The first 60 of 78.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73625111. Read Sun, Oct 4, 2026, 2:12 AM UTC.