Kansas earthquakes

M3.6 earthquake 3 km ENE of Renfrow, Oklahoma

A magnitude 3.6 earthquake struck 3 km ENE of Renfrow, Oklahoma on Fri, Apr 20, 2018, 2:28 PM CDT (19:28 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M3.7 10 km SSE of Marshall, Oklahoma. This one was a foreshock.

Caldwell forecast More in Kansas

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.6 (mwr), minor
Local time: Fri, Apr 20, 2018, 2:28 PM CDT
UTC: 2018-04-20 19:28:49 UTC
Depth: 5.5 km (3.4 mi), shallow
Epicenter: 36.945° N, 97.618° W
Region: Kansas
Felt reports: 13
Strongest shaking: IV, light shaking
PAGER alert: Green
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: IV, light shaking
Peak ground acceleration: 442.0% of gravity
Peak ground velocity: 0.5 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

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

Did You Feel It? map: shaking reported by the public — Shaking reported by the public, by area. Map: USGS Did You Feel It?

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	69%
1 to 10	29%
10 to 100	2%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Fault motion and ground failure

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

Faulting: Strike-slip
Moment magnitude: 3.6 Mwr
Nodal plane 1: Strike 65°, dip 79°, rake -159°
Nodal plane 2: Strike 331°, dip 70°, rake -11°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.05
Station coverage gap: 59°
Stations used: 0

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 86 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Kansas earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dpi1. Read Tue, Sep 22, 2026, 10:48 AM UTC.