M3.3 earthquake Oklahoma

A magnitude 3.3 earthquake struck in Oklahoma on Thu, Aug 20, 2015, 3:28 AM CDT (08:28 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.7 6 km SE of Perry, 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.

7 people reported to the USGS what they felt; the strongest reported shaking was II, 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 us100033m3. Read Wed, Sep 23, 2026, 6:10 AM UTC.