Idaho earthquakes

M1.6 earthquake 4 km S of Grace, Idaho

A magnitude 1.6 earthquake struck 4 km S of Grace, Idaho on Tue, Apr 20, 2021, 3:10 AM MDT (09:10 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 19 km E of Providence, Utah. This one was a foreshock.

Grace forecastMore in Idaho

Map

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

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The earthquake

Magnitude
1.6 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-04-20 09:10:49 UTC
Depth
4.8 km (3.0 mi), shallow
Epicenter
42.531° N, 111.736° W
Region
Idaho
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 0.4 km horizontally, 3.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
94°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 1.613 km NNW of Howell, Utah · 1986 days ago · 9 km deep · 96 km away
  2. 2.27 km E of Bancroft, Idaho · 1984 days ago · -2 km deep · 22 km away
  3. 1.91 km WNW of Franklin, Idaho · 1980 days ago · 0 km deep · 57 km away · felt by 8
  4. 1.810 km E of Franklin, Idaho · 1978 days ago · 9 km deep · 60 km away
  5. 2.2southern Idaho · 1978 days ago · 10 km deep · 95 km away · felt by 1
  6. 3.219 km E of Providence, Utah · 1966 days ago · 9 km deep · 94 km away · felt by 22
  7. 1.72 km WNW of Franklin, Idaho · 1958 days ago · 2 km deep · 57 km away
  8. 1.717 km WNW of Portage, Utah · 1953 days ago · 12 km deep · 82 km away
  9. 2.113 km ESE of Soda Springs, Idaho · 1944 days ago · -2 km deep · 24 km away
  10. 1.712 km W of Bloomington, Idaho · 1938 days ago · 5 km deep · 42 km away

Before

  1. 1.52 km WNW of Franklin, Idaho · 1993 days ago · 0 km deep · 57 km away
  2. 1.916 km SW of Fairview, Wyoming · 2006 days ago · 8 km deep · 50 km away
  3. 1.817 km NW of Paris, Idaho · 2014 days ago · 8 km deep · 27 km away
  4. 3.29 km ESE of Bancroft, Idaho · 2018 days ago · 10 km deep · 19 km away · felt by 7

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60433367. Read Sat, Oct 3, 2026, 2:00 PM UTC.