M2.5 earthquake 10 km W of Shamrock, Oklahoma

A magnitude 2.5 earthquake struck 10 km W of Shamrock, Oklahoma on Thu, Oct 13, 2011, 4:50 PM CDT (21:50 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.9 3 km WSW of Nicoma Park, Oklahoma. This one was a foreshock.

Map

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 85 in the 60 days after this one and 3 in the 30 days before it.

The first 60 of 85.

From the USGS Earthquake Hazards Program and its partner networks, event usp000j9af. Read Tue, Sep 22, 2026, 6:16 AM UTC.