M3.5 earthquake 8 km SSE of Byron, Oklahoma

A magnitude 3.5 earthquake struck 8 km SSE of Byron, Oklahoma on Tue, Jul 21, 2015, 1:24 PM CDT (18:24 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.6 11 km ENE of Quinlan, 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.

1 person 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 us20002yz5. Read Tue, Sep 22, 2026, 10:07 AM UTC.