M3.3 earthquake 4 km S of Summit Park, Utah
A magnitude 3.3 earthquake struck 4 km S of Summit Park, Utah on Mon, Sep 18, 2017, 11:21 AM MDT (17:21 UTC), 11 km (7 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.3 (ML, local (Richter)), minor
- Magnitude from
- University of Utah Seismograph Stations
- Local time
- UTC
- 2017-09-18 17:21:18 UTC
- Depth
- 11.0 km (6.8 mi), shallow
- Epicenter
- 40.701° N, 111.609° W
- Region
- Utah
- Felt reports
- 665
- Strongest shaking
- III, weak shaking
- 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 |
|---|---|---|---|
| 3.28 | ML, local (Richter) | University of Utah Seismograph Stations | Preferred · Final · ±0.139 · 22 stations |
| 3.3 | ML, local (Richter) | USGS National Earthquake Information Center | Reviewed · ±0.139 · 22 stations |
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- III, weak shaking
- Peak ground acceleration
- 135.0% of gravity
- Peak ground velocity
- 0.3 cm/s
- Map
- Automatic
Did you feel it?
665 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 0.3 km horizontally, 0.4 km in depth
- Magnitude uncertainty
- ±0.14
- Depth from
- From location
- Station coverage gap
- 32°
- Stations used
- 52
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 1 in the 30 days before it.
After
- 2.74 km ENE of Huntsville, Utah · 3302 days ago · 13 km deep · 64 km away · felt by 53
- 1.614 km SW of Woodruff, Utah · 3283 days ago · -2 km deep · 85 km away
- 1.63 km W of Layton, Utah · 3272 days ago · 10 km deep · 53 km away
- 2.08 km W of Perry, Utah · 3267 days ago · 1 km deep · 96 km away
- 2.03 km NE of Silver Summit, Utah · 3258 days ago · 13 km deep · 15 km away
- 1.73 km NE of Silver Summit, Utah · 3258 days ago · 13 km deep · 14 km away
- 2.16 km SE of Avon, Utah · 3247 days ago · 11 km deep · 89 km away
- 1.85 km SE of Avon, Utah · 3247 days ago · 12 km deep · 89 km away
- 1.97 km SE of Avon, Utah · 3247 days ago · 11 km deep · 88 km away
- 2.36 km SE of Avon, Utah · 3247 days ago · 12 km deep · 89 km away
Before
Earthquakes todayUtah earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uu60247422 (also filed as us2000aq2j). Read Sun, Oct 4, 2026, 1:54 AM UTC.