M2.8 earthquake 8 km NW of Helena, Oklahoma

A magnitude 2.8 earthquake struck 8 km NW of Helena, Oklahoma on Wed, May 20, 2015, 11:12 PM CDT (04:12 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 5 km NNE of Medford, Oklahoma. This one was a foreshock.

Map

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

2 people reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 200.

From the USGS Earthquake Hazards Program and its partner networks, event us10002b1f. Read Tue, Sep 22, 2026, 4:12 PM UTC.