M2.1 earthquake 12 km NW of Helper, Utah

Magnitude

2.1 (md), micro

Local time

Sun, Mar 17, 1985, 7:55 PM MST

UTC

1985-03-18 02:55:13 UTC

Depth

5.4 km (3.4 mi), shallow

Epicenter

39.765° N, 110.963° W

Region

Utah

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 3.4 km horizontally, 1.8 km in depth

Depth from

From location

Station coverage gap

237°, poorly surrounded by stations

Stations used

15

• Helper, UtahPopulation 2,112. Forecast13 kmNW
• Spanish Fork, UtahPopulation 37,935. Forecast71 kmESE
• Provo, UtahPopulation 115,162. Forecast79 kmSE
• Phoenix, ArizonaPopulation 1,650,070. Forecast709 kmN

After

1. 2.88 km NNE of Sunnyside, UtahThu, Apr 4, 6:01 PM MST · 15154 days ago · 3 km deep · 54 km away
2. 1.64 km SW of Levan, UtahTue, Apr 9, 10:27 AM MST · 15149 days ago · -1 km deep · 84 km away
3. 2.510 km NW of Helper, UtahTue, Apr 9, 5:40 PM MST · 15149 days ago · 3 km deep · 2 km away
4. 1.78 km NW of East Carbon City, UtahThu, Apr 18, 10:09 PM MST · 15139 days ago · -3 km deep · 45 km away
5. 2.38 km NNE of Sunnyside, UtahSun, Apr 21, 12:34 PM MST · 15137 days ago · 3 km deep · 54 km away
6. 1.93 km ENE of Sunnyside, UtahWed, Apr 24, 12:24 PM MST · 15134 days ago · 26 km deep · 57 km away
7. 2.38 km NNE of Sunnyside, UtahFri, Apr 26, 4:23 PM MST · 15132 days ago · 0 km deep · 54 km away
8. 1.612 km NW of Orangeville, UtahSat, Apr 27, 3:41 PM MST · 15131 days ago · 9 km deep · 54 km away
9. 2.47 km NNE of Sunnyside, UtahSat, May 4, 11:30 PM MDT · 15123 days ago · 3 km deep · 54 km away
10. 1.63 km SE of Fountain Green, UtahSun, May 5, 11:05 PM MDT · 15122 days ago · 4 km deep · 58 km away
11. 2.23 km SSE of Fountain Green, UtahSun, May 5, 11:52 PM MDT · 15122 days ago · 8 km deep · 59 km away
12. 2.92 km SSE of Fountain Green, UtahTue, May 7, 5:23 AM MDT · 15121 days ago · 6 km deep · 59 km away
13. 2.27 km N of Sunnyside, UtahTue, May 7, 1:30 PM MDT · 15121 days ago · 3 km deep · 51 km away
14. 2.47 km NNE of Sunnyside, UtahTue, May 7, 3:58 PM MDT · 15121 days ago · 7 km deep · 54 km away
15. 2.48 km NNE of Sunnyside, UtahTue, May 7, 9:24 PM MDT · 15120 days ago · 4 km deep · 54 km away
16. 2.29 km WNW of Orangeville, UtahThu, May 9, 9:55 AM MDT · 15119 days ago · 22 km deep · 60 km away
17. 2.38 km NNE of Sunnyside, UtahTue, May 14, 4:44 PM MDT · 15114 days ago · 5 km deep · 54 km away
18. 2.122 km ESE of Sterling, UtahWed, May 15, 1:48 PM MDT · 15113 days ago · 5 km deep · 83 km away

Before

1. 2.27 km N of Helper, UtahSun, Mar 10, 5:20 AM MST · 15179 days ago · 3 km deep · 10 km away
2. 2.312 km ENE of Kenilworth, UtahMon, Mar 4, 11:00 AM MST · 15185 days ago · -2 km deep · 26 km away
3. 1.97 km ENE of Kenilworth, UtahWed, Feb 27, 6:54 PM MST · 15189 days ago · -3 km deep · 22 km away
4. 1.719 km ESE of Mount Pleasant, UtahFri, Feb 22, 10:09 PM MST · 15194 days ago · 3 km deep · 39 km away
5. 1.615 km ESE of Mount Pleasant, UtahFri, Feb 22, 10:02 PM MST · 15194 days ago · 5 km deep · 42 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu50020500. Read Wed, Sep 30, 2026, 12:49 PM UTC.