M3.5 earthquake 7 km ESE of Assaria, Kansas

A magnitude 3.5 earthquake struck 7 km ESE of Assaria, Kansas on Wed, Dec 15, 2021, 9:03 AM CST (15:03 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.7 6 km SW of Gypsum, Kansas. 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.

20 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 23 in the 60 days after this one and 15 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000gced. Read Wed, Sep 23, 2026, 3:32 AM UTC.