M3.1 earthquake 4 km WNW of Jefferson, Oklahoma

A magnitude 3.1 earthquake struck 4 km WNW of Jefferson, Oklahoma on Sun, Oct 18, 2015, 11:55 PM CDT (04:55 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.1 7 km SSE of Byron, Oklahoma. This one was a foreshock.

Map

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

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

11 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

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 us10003pl4. Read Tue, Sep 22, 2026, 8:03 AM UTC.