M2.5 earthquake 10 km NW of Helper, Utah

Magnitude

2.5 (md), micro

Local time

Tue, Apr 9, 1985, 5:40 PM MST

UTC

1985-04-10 00:40:14 UTC

Depth

3.3 km (2.1 mi), shallow

Epicenter

39.748° N, 110.945° W

Region

Utah

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.8 km horizontally, 1.2 km in depth

Depth from

From location

Station coverage gap

196°, poorly surrounded by stations

Stations used

22

• Helper, UtahPopulation 2,112. Forecast10 kmNW
• Spanish Fork, UtahPopulation 37,935. Forecast73 kmSE
• Provo, UtahPopulation 115,162. Forecast81 kmSE
• Phoenix, ArizonaPopulation 1,650,070. Forecast708 kmN

After

1. 1.78 km NW of East Carbon City, UtahThu, Apr 18, 10:09 PM MST · 15131 days ago · -3 km deep · 43 km away
2. 2.38 km NNE of Sunnyside, UtahSun, Apr 21, 12:34 PM MST · 15129 days ago · 3 km deep · 52 km away
3. 1.93 km ENE of Sunnyside, UtahWed, Apr 24, 12:24 PM MST · 15126 days ago · 26 km deep · 55 km away
4. 2.38 km NNE of Sunnyside, UtahFri, Apr 26, 4:23 PM MST · 15123 days ago · 0 km deep · 53 km away
5. 1.612 km NW of Orangeville, UtahSat, Apr 27, 3:41 PM MST · 15122 days ago · 9 km deep · 53 km away
6. 2.47 km NNE of Sunnyside, UtahSat, May 4, 11:30 PM MDT · 15115 days ago · 3 km deep · 52 km away
7. 1.63 km SE of Fountain Green, UtahSun, May 5, 11:05 PM MDT · 15114 days ago · 4 km deep · 59 km away
8. 2.23 km SSE of Fountain Green, UtahSun, May 5, 11:52 PM MDT · 15114 days ago · 8 km deep · 60 km away
9. 2.92 km SSE of Fountain Green, UtahTue, May 7, 5:23 AM MDT · 15113 days ago · 6 km deep · 60 km away
10. 2.27 km N of Sunnyside, UtahTue, May 7, 1:30 PM MDT · 15113 days ago · 3 km deep · 49 km away
11. 2.47 km NNE of Sunnyside, UtahTue, May 7, 3:58 PM MDT · 15113 days ago · 7 km deep · 52 km away
12. 2.48 km NNE of Sunnyside, UtahTue, May 7, 9:24 PM MDT · 15112 days ago · 4 km deep · 52 km away
13. 2.29 km WNW of Orangeville, UtahThu, May 9, 9:55 AM MDT · 15111 days ago · 22 km deep · 58 km away
14. 2.38 km NNE of Sunnyside, UtahTue, May 14, 4:44 PM MDT · 15105 days ago · 5 km deep · 52 km away
15. 2.122 km ESE of Sterling, UtahWed, May 15, 1:48 PM MDT · 15105 days ago · 5 km deep · 82 km away
16. 2.59 km NNE of Sunnyside, UtahTue, May 21, 12:57 AM MDT · 15099 days ago · 3 km deep · 54 km away
17. 2.112 km NE of Sunnyside, UtahTue, May 21, 2:50 PM MDT · 15099 days ago · 9 km deep · 59 km away
18. 2.77 km NNE of Sunnyside, UtahThu, May 30, 6:52 PM MDT · 15089 days ago · -2 km deep · 51 km away
19. 2.59 km ENE of Kenilworth, UtahSat, Jun 1, 12:22 PM MDT · 15088 days ago · 4 km deep · 22 km away
20. 2.711 km ENE of Kenilworth, UtahMon, Jun 3, 1:36 AM MDT · 15086 days ago · 4 km deep · 24 km away
21. 2.66 km ENE of Sunnyside, UtahFri, Jun 7, 12:40 AM MDT · 15082 days ago · 3 km deep · 57 km away
22. 2.45 km ESE of Fayette, UtahFri, Jun 7, 3:01 PM MDT · 15082 days ago · 7 km deep · 96 km away

Before

1. 1.64 km SW of Levan, UtahTue, Apr 9, 10:27 AM MST · 15141 days ago · -1 km deep · 85 km away
2. 2.88 km NNE of Sunnyside, UtahThu, Apr 4, 6:01 PM MST · 15145 days ago · 3 km deep · 52 km away
3. 2.112 km NW of Helper, UtahSun, Mar 17, 7:55 PM MST · 15163 days ago · 5 km deep · 2 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu50020885. Read Tue, Sep 22, 2026, 9:57 AM UTC.