M1.8 earthquake 13 km NW of Summit, Utah
A magnitude 1.8 earthquake struck 13 km NW of Summit, Utah on Mon, Dec 21, 1987, 8:42 AM MST (15:42 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M2.9 7 km E of Hildale, Utah. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (md), micro
- Local time
- UTC
- 1987-12-21 15:42:03 UTC
- Depth
- 4.7 km (2.9 mi), shallow
- Epicenter
- 37.896° N, 113.034° W
- Region
- Utah
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
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 1.4 km horizontally, 1.8 km in depth
- Depth from
- From location
- Station coverage gap
- 205°, poorly surrounded by stations
- Stations used
- 6
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 4 in the 30 days before it.
After
- 2.97 km E of Hildale, Utah · 14144 days ago · 4 km deep · 99 km away
- 2.99 km SW of Cedar City, Utah · 14144 days ago · 5 km deep · 32 km away
- 2.47 km NE of Cedar City, UT · 14143 days ago · -3 km deep · 30 km away
- 3.17 km N of Cane Beds, Arizona · 14143 days ago · 11 km deep · 99 km away
- 2.413 km SSE of Minersville, Utah · 14127 days ago · 7 km deep · 29 km away
Before
Earthquakes todayUtah earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uu50035120. Read Tue, Sep 22, 2026, 8:04 PM UTC.