M1.7 earthquake 38 km ESE of Ruth, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Apr 28, 1986, 5:34 AM PDT

UTC

1986-04-28 12:34:00 UTC

Depth

12.4 km (7.7 mi), shallow

Epicenter

40.096° N, 122.927° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.5 km horizontally, 4.2 km in depth

Depth from

From location

Station coverage gap

128°

Stations used

6

• Covelo, CaliforniaPopulation 1,255. Forecast43 kmNE
• Red Bluff, CaliforniaPopulation 14,131. Forecast59 kmW
• Chico, CaliforniaPopulation 121,345. Forecast102 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast790 kmNNW

After

1. 1.618 km ENE of Willows, CaliforniaMon, Apr 28, 6:21 PM PDT · 14767 days ago · 4 km deep · 99 km away
2. 2.32 km NNW of Redcrest, CaliforniaThu, May 1, 11:39 AM PDT · 14764 days ago · 29 km deep · 95 km away
3. 1.67 km SSE of Willits, CaliforniaWed, May 7, 7:29 AM PDT · 14758 days ago · 4 km deep · 91 km away
4. 1.613 km WNW of Paynes Creek, CaliforniaWed, May 7, 7:45 AM PDT · 14758 days ago · 23 km deep · 79 km away
5. 4.17 km W of Lodoga, CaliforniaThu, May 8, 7:14 AM PDT · 14757 days ago · 3 km deep · 92 km away
6. 2.98 km SSW of Hyampom, CaliforniaThu, May 8, 2:54 PM PDT · 14757 days ago · 0 km deep · 69 km away
7. 1.67 km S of Cottonwood, CaliforniaThu, May 8, 3:59 PM PDT · 14757 days ago · 5 km deep · 61 km away
8. 1.512 km ENE of Trinity Village, CaliforniaFri, May 9, 11:27 PM PDT · 14756 days ago · 4 km deep · 99 km away
9. 2.211 km NE of Phillipsville, CaliforniaSat, May 10, 2:26 PM PDT · 14755 days ago · 23 km deep · 69 km away
10. 1.723 km ENE of Potter Valley, CaliforniaMon, May 12, 2:09 PM PDT · 14753 days ago · 9 km deep · 77 km away
11. 2.80 km WSW of Central Valley (historical), CaliforniaWed, May 14, 8:41 PM PDT · 14751 days ago · 24 km deep · 80 km away
12. 1.74 km WNW of Bella Vista, CaliforniaThu, May 15, 1:56 AM PDT · 14750 days ago · 4 km deep · 83 km away
13. 2.412 km SSE of Hayfork, CaliforniaThu, May 15, 6:50 AM PDT · 14750 days ago · 22 km deep · 43 km away
14. 1.65 km W of Willows, CaliforniaSat, May 17, 12:40 AM PDT · 14749 days ago · 5 km deep · 86 km away
15. 2.817 km SW of Burnt Ranch, CaliforniaSun, May 18, 7:05 AM PDT · 14747 days ago · 4 km deep · 91 km away
16. 2.57 km ENE of Brooktrails, CaliforniaSun, May 18, 6:17 PM PDT · 14747 days ago · 4 km deep · 78 km away
17. 1.54 km W of Bella Vista, CaliforniaMon, May 19, 12:35 AM PDT · 14747 days ago · 4 km deep · 82 km away
18. 2.30 km S of Shasta Lake, CaliforniaMon, May 19, 3:08 AM PDT · 14746 days ago · 26 km deep · 80 km away
19. 2.38 km S of Douglas City, CaliforniaSat, May 24, 11:05 PM PDT · 14741 days ago · 22 km deep · 53 km away
20. 1.818 km NNE of Upper Lake, CaliforniaTue, May 27, 5:05 PM PDT · 14738 days ago · 4 km deep · 89 km away
21. 2.46 km E of Orland, CaliforniaWed, May 28, 9:47 PM PDT · 14737 days ago · 4 km deep · 79 km away
22. 1.96 km W of Covelo, CaliforniaFri, Jun 6, 4:57 AM PDT · 14728 days ago · 7 km deep · 47 km away
23. 1.813 km NE of Upper Lake, CaliforniaSat, Jun 7, 12:42 AM PDT · 14728 days ago · 10 km deep · 93 km away
24. 1.913 km E of Cottonwood, CaliforniaSat, Jun 7, 3:18 AM PDT · 14727 days ago · 4 km deep · 74 km away
25. 1.58 km ENE of Benbow, CaliforniaTue, Jun 10, 3:03 AM PDT · 14724 days ago · 27 km deep · 65 km away
26. 1.811 km N of Cleone, CaliforniaTue, Jun 10, 9:18 AM PDT · 14724 days ago · 30 km deep · 93 km away
27. 3.48 km WSW of Redway, CaliforniaThu, Jun 12, 8:10 PM PDT · 14722 days ago · 4 km deep · 84 km away
28. 2.210 km SE of Ruth, CaliforniaFri, Jun 13, 10:53 AM PDT · 14721 days ago · 45 km deep · 30 km away
29. 2.328 km NW of Paskenta, CaliforniaFri, Jun 13, 9:57 PM PDT · 14721 days ago · 18 km deep · 12 km away
30. 1.719 km NE of Potter Valley, CaliforniaSat, Jun 14, 8:52 PM PDT · 14720 days ago · 4 km deep · 73 km away
31. 1.87 km SW of Brooktrails, CaliforniaMon, Jun 16, 4:13 PM PDT · 14718 days ago · 6 km deep · 90 km away
32. 2.312 km SE of Bend, CaliforniaWed, Jun 18, 8:08 PM PDT · 14716 days ago · 22 km deep · 72 km away
33. 2.30 km SE of Shasta Lake, CaliforniaWed, Jun 18, 9:45 PM PDT · 14716 days ago · 28 km deep · 80 km away
34. 2.214 km ENE of Weott, CaliforniaFri, Jun 20, 9:08 PM PDT · 14714 days ago · 13 km deep · 78 km away
35. 2.26 km W of Laytonville, CaliforniaSat, Jun 21, 8:02 AM PDT · 14713 days ago · 3 km deep · 70 km away
36. 3.510 km N of Hyampom, CaliforniaSun, Jun 22, 4:57 PM PDT · 14712 days ago · 28 km deep · 82 km away
37. 2.9near the coast of Northern CaliforniaWed, Jun 25, 12:33 AM PDT · 14710 days ago · 5 km deep · 99 km away
38. 2.710 km SSE of Willows, CaliforniaWed, Jun 25, 2:34 PM PDT · 14709 days ago · 45 km deep · 99 km away
39. 1.714 km ESE of Shelter Cove, CaliforniaWed, Jun 25, 9:28 PM PDT · 14709 days ago · 3 km deep · 85 km away
40. 2.412 km NE of Phillipsville, CaliforniaThu, Jun 26, 5:50 AM PDT · 14708 days ago · 22 km deep · 69 km away
41. 2.14 km W of Laytonville, CaliforniaThu, Jun 26, 6:51 PM PDT · 14708 days ago · 1 km deep · 69 km away
42. 2.95 km W of Laytonville, CaliforniaFri, Jun 27, 2:34 AM PDT · 14707 days ago · 3 km deep · 70 km away

Before

1. 1.829 km NE of Potter Valley, CaliforniaSun, Apr 27, 12:46 PM PDT · 14768 days ago · 4 km deep · 63 km away
2. 1.629 km NE of Potter Valley, CaliforniaSun, Apr 27, 11:42 AM PDT · 14768 days ago · 4 km deep · 63 km away
3. 1.629 km NE of Potter Valley, CaliforniaFri, Apr 25, 4:16 AM PST · 14770 days ago · 4 km deep · 63 km away
4. 2.122 km NW of Paskenta, CaliforniaSat, Apr 19, 7:30 PM PST · 14776 days ago · 9 km deep · 17 km away
5. 1.610 km WNW of Potter Valley, CaliforniaSat, Apr 19, 11:34 AM PST · 14776 days ago · 7 km deep · 85 km away
6. 1.710 km NNW of Redwood Valley, CaliforniaFri, Apr 18, 6:19 PM PST · 14777 days ago · 7 km deep · 86 km away
7. 1.513 km SE of Laytonville, CaliforniaFri, Apr 18, 1:59 PM PST · 14777 days ago · 5 km deep · 68 km away
8. 2.36 km ENE of Rancho Tehama Reserve, CaliforniaWed, Apr 16, 1:22 PM PST · 14779 days ago · 4 km deep · 51 km away
9. 1.913 km SSW of Mad River, CaliforniaMon, Apr 14, 3:50 AM PST · 14781 days ago · 4 km deep · 62 km away
10. 2.111 km ESE of Willits, CaliforniaSat, Apr 12, 11:18 PM PST · 14783 days ago · 7 km deep · 85 km away
11. 2.17 km WNW of Cohasset, CaliforniaTue, Apr 8, 3:27 PM PST · 14787 days ago · 4 km deep · 96 km away
12. 2.02 km NNW of Redway, CaliforniaMon, Apr 7, 5:19 PM PST · 14788 days ago · 17 km deep · 78 km away
13. 2.16 km NNW of Mad River, CaliforniaMon, Apr 7, 9:08 AM PST · 14788 days ago · 2 km deep · 69 km away
14. 2.59 km NNW of Mad River, CaliforniaMon, Apr 7, 1:58 AM PST · 14788 days ago · -1 km deep · 71 km away
15. 1.614 km SE of Laytonville, CaliforniaSat, Apr 5, 12:30 AM PST · 14791 days ago · 7 km deep · 68 km away
16. 1.610 km ESE of Cottonwood, CaliforniaFri, Apr 4, 1:05 AM PST · 14791 days ago · 21 km deep · 70 km away
17. 2.19 km SE of Willits, CaliforniaThu, Apr 3, 5:19 PM PST · 14792 days ago · 5 km deep · 87 km away
18. 1.822 km NNW of Covelo, CaliforniaThu, Apr 3, 6:36 AM PST · 14792 days ago · -1 km deep · 41 km away
19. 2.14 km N of Redway, CaliforniaWed, Apr 2, 12:56 PM PST · 14793 days ago · 15 km deep · 76 km away
20. 1.916 km NW of Brooktrails, CaliforniaWed, Apr 2, 8:59 AM PST · 14793 days ago · 4 km deep · 80 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc10085672. Read Fri, Oct 2, 2026, 8:14 PM UTC.