M3.6 earthquake 12 km WSW of Ralston, Oklahoma

A magnitude 3.6 earthquake struck 12 km WSW of Ralston, Oklahoma on Wed, Apr 4, 2018, 1:17 PM CDT (18:17 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.9 5 km WNW of Lucien, 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.

8 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: 100 in the 60 days after this one and 33 in the 30 days before it.

The first 60 of 100.

From the USGS Earthquake Hazards Program and its partner networks, event us1000de9d. Read Tue, Sep 22, 2026, 3:55 PM UTC.