M2.7 earthquake 8 km NW of Helper, Utah

Magnitude

2.7 (md), micro

Local time

Sat, Dec 20, 1986, 8:50 AM MST

UTC

1986-12-20 15:50:00 UTC

Depth

6.3 km (3.9 mi), shallow

Epicenter

39.742° N, 110.927° W

Region

Utah

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.1 km horizontally, 1.8 km in depth

Depth from

From location

Station coverage gap

177°

Stations used

17

• Helper, UtahPopulation 2,112. Forecast9 kmNW
• Spanish Fork, UtahPopulation 37,935. Forecast75 kmESE
• Provo, UtahPopulation 115,162. Forecast83 kmSE
• Phoenix, ArizonaPopulation 1,650,070. Forecast707 kmN

After

1. 2.414 km W of Huntington, UtahSun, Dec 21, 10:50 AM MST · 14520 days ago · 3 km deep · 47 km away
2. 2.53 km NNW of Kenilworth, UtahWed, Dec 24, 8:11 AM MST · 14517 days ago · 6 km deep · 10 km away
3. 1.83 km NNW of Rocky Ridge, UtahFri, Dec 26, 5:31 AM MST · 14515 days ago · 0 km deep · 82 km away
4. 2.912 km NNW of Orangeville, UtahThu, Jan 1, 6:26 AM MST · 14509 days ago · 4 km deep · 49 km away
5. 2.99 km NW of Helper, UtahThu, Jan 8, 7:59 AM MST · 14502 days ago · 5 km deep · 1 km away
6. 2.127 km SSE of Independence, UtahSat, Jan 10, 4:02 AM MST · 14500 days ago · 2 km deep · 41 km away
7. 2.510 km NW of Helper, UtahTue, Jan 13, 3:46 AM MST · 14497 days ago · 4 km deep · 1 km away
8. 3.39 km SSE of Mayfield, UtahFri, Jan 16, 4:27 PM MST · 14494 days ago · 19 km deep · 100 km away
9. 2.712 km WNW of Huntington, UtahSat, Jan 17, 7:01 AM MST · 14493 days ago · 2 km deep · 46 km away
10. 2.714 km WNW of Huntington, UtahSun, Jan 18, 8:04 PM MST · 14492 days ago · 3 km deep · 46 km away
11. 2.911 km W of Huntington, UtahWed, Jan 21, 3:06 AM MST · 14489 days ago · 4 km deep · 48 km away
12. 1.712 km SSW of Levan, UtahWed, Jan 21, 5:52 AM MST · 14489 days ago · 15 km deep · 90 km away
13. 2.25 km ESE of Heber City, UtahFri, Jan 23, 11:12 AM MST · 14487 days ago · 8 km deep · 91 km away
14. 2.1UtahThu, Jan 29, 12:57 PM MST · 14481 days ago · 8 km deep · 95 km away
15. 1.85 km WSW of Vineyard, UtahThu, Jan 29, 12:57 PM MST · 14481 days ago · 2 km deep · 95 km away
16. 2.313 km WNW of Huntington, UtahWed, Feb 4, 4:15 PM MST · 14475 days ago · 3 km deep · 46 km away
17. 3.113 km WNW of Huntington, UtahWed, Feb 4, 5:15 PM MST · 14475 days ago · 4 km deep · 46 km away
18. 2.7UtahThu, Feb 5, 4:17 AM MST · 14474 days ago · 3 km deep · 46 km away
19. 2.413 km WNW of Huntington, UtahSun, Feb 8, 3:41 AM MST · 14471 days ago · 4 km deep · 46 km away
20. 2.012 km NE of Springville, UtahSun, Feb 8, 11:26 AM MST · 14471 days ago · -3 km deep · 75 km away
21. 2.25 km ENE of Daniel, UtahMon, Feb 9, 12:57 AM MST · 14471 days ago · 13 km deep · 90 km away
22. 3.014 km W of Huntington, UtahTue, Feb 10, 9:35 PM MST · 14469 days ago · 4 km deep · 47 km away
23. 2.90 km NE of Mount Nebo, UtahThu, Feb 12, 2:01 PM MST · 14467 days ago · 7 km deep · 90 km away

Before

1. 1.62 km SW of Rocky Ridge, UtahSat, Dec 13, 3:50 PM MST · 14528 days ago · 7 km deep · 81 km away
2. 1.98 km NNW of Orangeville, UtahTue, Dec 9, 4:44 PM MST · 14532 days ago · 8 km deep · 52 km away
3. 3.114 km WNW of Huntington, UtahWed, Nov 26, 6:42 PM MST · 14545 days ago · 3 km deep · 46 km away
4. 2.814 km W of Huntington, UtahWed, Nov 26, 6:40 PM MST · 14545 days ago · 3 km deep · 48 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu50031020. Read Tue, Sep 22, 2026, 8:41 PM UTC.