Utah earthquakes

M4.3 earthquake 9 km E of Scipio, Utah

A magnitude 4.3 earthquake struck 9 km E of Scipio, Utah on Mon, Mar 24, 1986, 3:40 PM MST (22:40 UTC), 2 km (1 mi) below the surface.

Gunnison forecast More in Utah

Map

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

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The earthquake

Magnitude: 4.3 (ML, local (Richter)), light
Magnitude from: University of Utah Seismograph Stations
Local time: Mon, Mar 24, 1986, 3:40 PM MST
UTC: 1986-03-24 22:40:23 UTC
Depth: 1.9 km (1.2 mi), shallow
Epicenter: 39.230° N, 111.995° W
Region: Utah
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.3	ML, local (Richter)	University of Utah Seismograph Stations	Preferred · Final · 2 stations
4.7	mb, body-wave	USGS National Earthquake Information Center	Reviewed · 7 stations
4.7	mb, body-wave	USGS historic United States catalog	Final

What happened

The USGS’s account of the effects of this earthquake.

Felt (V) at Scipio, (IV) at Axtell, Fayette, Gunnison and Redmont, (III) at Centerfield, Ephraim, Fountain Green, Oak City and Salina.

Maximum observed Modified Mercalli Intensity (MMI) V

From the USGS event page for uu50028735. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.7 km horizontally, 1.4 km in depth
Depth from: From location
Station coverage gap: 85°
Stations used: 17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 14 in the 30 days before it.

After

Before

Earthquakes today Utah earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu50028735 (also filed as ushis3923, usp0002s7x). Read Sat, Oct 3, 2026, 3:25 PM UTC.