M3.3 earthquake 9 km NW of Helena, Oklahoma

A magnitude 3.3 earthquake struck 9 km NW of Helena, Oklahoma on Wed, Dec 9, 2015, 5:12 PM CST (23:12 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.4 15 km SE of Waynoka, Oklahoma. This one was a foreshock.

Map

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

3 people reported to the USGS what they felt; the strongest reported shaking was III, 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 us20004g14. Read Tue, Sep 22, 2026, 4:13 PM UTC.