California earthquakes

M2.1 earthquake 4km WSW of Pleasanton, CA

A magnitude 2.1 earthquake struck 4km WSW of Pleasanton, CA on Thu, Apr 1, 2021, 9:50 AM PDT (16:50 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.6 15km N of Morgan Hill, CA. This one was a foreshock.

Pleasanton 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
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-04-01 16:50:34 UTC
Depth
8.1 km (5.1 mi), shallow
Epicenter
37.646° N, 121.912° 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 0.1 km horizontally, 0.2 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
45°
Stations used
47

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 70 in the 60 days after this one and 29 in the 30 days before it.

After

The first 60 of 70.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73544780. Read Sat, Oct 3, 2026, 6:27 PM UTC.