M1.7 earthquake 6 km NE of Brooktrails, California

Magnitude

1.7 (md), micro

Local time

Wed, Aug 21, 1985, 11:38 PM PDT

UTC

1985-08-22 06:38:14 UTC

Depth

7.4 km (4.6 mi), shallow

Epicenter

39.478° N, 123.321° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.5 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

82°

Stations used

16

• Brooktrails, CaliforniaPopulation 3,235. Forecast7 kmNE
• Ukiah, CaliforniaPopulation 15,917. Forecast38 kmNNW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast127 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast754 kmNW

After

1. 1.55 km SW of Cobb, CaliforniaThu, Aug 22, 3:09 AM PDT · 15012 days ago · 1 km deep · 91 km away
2. 1.55 km WSW of Cobb, CaliforniaThu, Aug 22, 12:14 PM PDT · 15012 days ago · 0 km deep · 89 km away
3. 1.85 km WSW of Cobb, CaliforniaThu, Aug 22, 12:38 PM PDT · 15012 days ago · 0 km deep · 89 km away
4. 2.07 km W of Cobb, CaliforniaThu, Aug 22, 2:22 PM PDT · 15012 days ago · 3 km deep · 86 km away
5. 1.98 km WSW of Cobb, CaliforniaFri, Aug 23, 9:08 PM PDT · 15011 days ago · 3 km deep · 87 km away
6. 2.28 km WSW of Cobb, CaliforniaFri, Aug 23, 9:14 PM PDT · 15011 days ago · 3 km deep · 87 km away
7. 2.93 km NNE of Clearlake, CaliforniaSat, Aug 24, 6:13 AM PDT · 15010 days ago · 1 km deep · 82 km away
8. 1.63 km NNE of Clearlake, CaliforniaSat, Aug 24, 7:55 AM PDT · 15010 days ago · -1 km deep · 82 km away
9. 1.97 km WSW of Cobb, CaliforniaSat, Aug 24, 9:35 AM PDT · 15010 days ago · 4 km deep · 87 km away
10. 2.05 km WNW of Cobb, CaliforniaSat, Aug 24, 6:15 PM PDT · 15010 days ago · 1 km deep · 85 km away
11. 1.96 km WSW of Cobb, CaliforniaSat, Aug 24, 7:01 PM PDT · 15010 days ago · 3 km deep · 87 km away
12. 1.63 km N of Clearlake, CaliforniaSat, Aug 24, 8:59 PM PDT · 15010 days ago · -1 km deep · 81 km away
13. 1.69 km WSW of Cobb, CaliforniaSun, Aug 25, 1:49 AM PDT · 15010 days ago · 1 km deep · 86 km away
14. 1.66 km NNE of Hopland, CaliforniaSun, Aug 25, 5:14 PM PDT · 15009 days ago · 0 km deep · 54 km away
15. 1.67 km WSW of Cobb, CaliforniaTue, Aug 27, 1:56 AM PDT · 15008 days ago · 0 km deep · 87 km away
16. 1.86 km WSW of Cobb, CaliforniaTue, Aug 27, 6:12 PM PDT · 15007 days ago · 0 km deep · 88 km away
17. 1.86 km WSW of Cobb, CaliforniaTue, Aug 27, 6:13 PM PDT · 15007 days ago · 1 km deep · 87 km away
18. 2.20 km S of Brooktrails, CaliforniaTue, Aug 27, 11:20 PM PDT · 15007 days ago · -1 km deep · 7 km away
19. 1.58 km W of Cobb, CaliforniaWed, Aug 28, 4:41 AM PDT · 15006 days ago · 1 km deep · 85 km away
20. 2.25 km SW of Cobb, CaliforniaThu, Aug 29, 8:04 AM PDT · 15005 days ago · 0 km deep · 91 km away
21. 2.07 km W of Cobb, CaliforniaThu, Aug 29, 3:54 PM PDT · 15005 days ago · 3 km deep · 86 km away
22. 2.520 km WSW of Williams, CaliforniaThu, Aug 29, 6:19 PM PDT · 15005 days ago · 2 km deep · 91 km away
23. 2.220 km WSW of Williams, CaliforniaThu, Aug 29, 6:35 PM PDT · 15005 days ago · 0 km deep · 91 km away
24. 2.021 km WSW of Williams, CaliforniaThu, Aug 29, 7:00 PM PDT · 15005 days ago · 2 km deep · 89 km away
25. 1.94 km W of Cobb, CaliforniaFri, Aug 30, 10:57 AM PDT · 15004 days ago · 1 km deep · 87 km away
26. 1.96 km SW of Cobb, CaliforniaFri, Aug 30, 11:42 AM PDT · 15004 days ago · 0 km deep · 90 km away
27. 1.84 km W of Cobb, CaliforniaFri, Aug 30, 9:56 PM PDT · 15004 days ago · 0 km deep · 87 km away
28. 1.96 km W of Cobb, CaliforniaSat, Aug 31, 6:14 AM PDT · 15003 days ago · 2 km deep · 87 km away
29. 2.26 km W of Cobb, CaliforniaSat, Aug 31, 9:11 AM PDT · 15003 days ago · 0 km deep · 87 km away
30. 2.420 km WSW of Williams, CaliforniaSun, Sep 1, 11:38 PM PDT · 15002 days ago · 2 km deep · 91 km away
31. 2.620 km WSW of Williams, CaliforniaMon, Sep 2, 12:15 AM PDT · 15002 days ago · 2 km deep · 90 km away
32. 1.89 km ESE of Willits, CaliforniaMon, Sep 2, 6:42 AM PDT · 15001 days ago · 8 km deep · 12 km away
33. 1.922 km WSW of Williams, CaliforniaMon, Sep 2, 9:45 AM PDT · 15001 days ago · 2 km deep · 90 km away
34. 2.33 km SW of Cobb, CaliforniaMon, Sep 2, 10:12 AM PDT · 15001 days ago · 1 km deep · 91 km away
35. 1.78 km WSW of Cobb, CaliforniaMon, Sep 2, 1:53 PM PDT · 15001 days ago · 3 km deep · 87 km away
36. 1.95 km SW of Cobb, CaliforniaMon, Sep 2, 2:55 PM PDT · 15001 days ago · 0 km deep · 91 km away
37. 1.614 km ENE of Clearlake Oaks, CaliforniaMon, Sep 2, 4:14 PM PDT · 15001 days ago · 10 km deep · 83 km away
38. 1.616 km ENE of Leggett, CaliforniaMon, Sep 2, 11:52 PM PDT · 15001 days ago · 2 km deep · 50 km away
39. 1.56 km W of Cobb, CaliforniaTue, Sep 3, 12:02 AM PDT · 15001 days ago · 3 km deep · 86 km away
40. 2.55 km SSW of Cobb, CaliforniaTue, Sep 3, 6:26 AM PDT · 15000 days ago · 1 km deep · 91 km away
41. 1.68 km WSW of Cobb, CaliforniaTue, Sep 3, 9:19 PM PDT · 15000 days ago · 4 km deep · 88 km away
42. 1.65 km SW of Cobb, CaliforniaThu, Sep 5, 5:07 AM PDT · 14998 days ago · 0 km deep · 91 km away
43. 1.56 km W of Cobb, CaliforniaThu, Sep 5, 6:24 AM PDT · 14998 days ago · 3 km deep · 86 km away
44. 2.58 km SE of Alderpoint, CaliforniaThu, Sep 5, 12:30 PM PDT · 14998 days ago · 3 km deep · 73 km away
45. 1.78 km W of Cobb, CaliforniaThu, Sep 5, 1:43 PM PDT · 14998 days ago · 0 km deep · 86 km away
46. 1.56 km W of Cobb, CaliforniaFri, Sep 6, 7:17 AM PDT · 14997 days ago · 1 km deep · 85 km away
47. 1.98 km WSW of Cobb, CaliforniaFri, Sep 6, 7:41 AM PDT · 14997 days ago · 0 km deep · 87 km away
48. 1.56 km W of Cobb, CaliforniaFri, Sep 6, 11:38 AM PDT · 14997 days ago · 3 km deep · 86 km away
49. 2.36 km SW of Cobb, CaliforniaFri, Sep 6, 1:49 PM PDT · 14997 days ago · 0 km deep · 90 km away
50. 1.66 km SW of Cobb, CaliforniaFri, Sep 6, 1:49 PM PDT · 14997 days ago · 0 km deep · 90 km away
51. 1.96 km WSW of Cobb, CaliforniaFri, Sep 6, 5:27 PM PDT · 14997 days ago · 3 km deep · 87 km away
52. 1.77 km WNW of Cobb, CaliforniaFri, Sep 6, 6:44 PM PDT · 14997 days ago · -1 km deep · 84 km away
53. 1.64 km N of Cobb, CaliforniaFri, Sep 6, 8:50 PM PDT · 14997 days ago · 2 km deep · 86 km away
54. 2.54 km WSW of Cobb, CaliforniaFri, Sep 6, 11:00 PM PDT · 14997 days ago · 2 km deep · 89 km away
55. 1.69 km W of Cobb, CaliforniaSat, Sep 7, 12:00 AM PDT · 14997 days ago · 2 km deep · 84 km away
56. 2.36 km W of Cobb, CaliforniaSat, Sep 7, 1:03 AM PDT · 14997 days ago · 3 km deep · 86 km away
57. 2.58 km W of Cobb, CaliforniaSat, Sep 7, 3:49 AM PDT · 14996 days ago · 0 km deep · 85 km away
58. 1.87 km W of Cobb, CaliforniaSat, Sep 7, 3:52 AM PDT · 14996 days ago · 0 km deep · 86 km away
59. 2.16 km W of Cobb, CaliforniaSat, Sep 7, 5:45 AM PDT · 14996 days ago · 2 km deep · 86 km away
60. 1.65 km WSW of Cobb, CaliforniaSat, Sep 7, 9:26 AM PDT · 14996 days ago · 1 km deep · 88 km away

The first 60 of 198.

Before

1. 1.65 km WSW of Cobb, CaliforniaWed, Aug 21, 2:12 PM PDT · 15013 days ago · 1 km deep · 87 km away
2. 2.85 km W of Cobb, CaliforniaWed, Aug 21, 1:57 AM PDT · 15014 days ago · 1 km deep · 86 km away
3. 2.26 km NW of Cobb, CaliforniaTue, Aug 20, 10:19 PM PDT · 15014 days ago · -1 km deep · 83 km away
4. 2.35 km W of Cobb, CaliforniaTue, Aug 20, 3:32 PM PDT · 15014 days ago · -1 km deep · 86 km away
5. 2.09 km SSE of Willits, CaliforniaTue, Aug 20, 3:26 PM PDT · 15014 days ago · 6 km deep · 16 km away
6. 1.66 km WNW of Cobb, CaliforniaMon, Aug 19, 10:35 PM PDT · 15015 days ago · 1 km deep · 85 km away
7. 1.66 km NNE of Cloverdale, CaliforniaMon, Aug 19, 5:12 PM PDT · 15015 days ago · 5 km deep · 75 km away
8. 1.86 km W of Cobb, CaliforniaMon, Aug 19, 1:53 PM PDT · 15015 days ago · 3 km deep · 86 km away
9. 1.87 km W of Cobb, CaliforniaMon, Aug 19, 1:45 PM PDT · 15015 days ago · 3 km deep · 86 km away
10. 1.910 km SE of Hopland, CaliforniaMon, Aug 19, 12:50 PM PDT · 15015 days ago · 29 km deep · 68 km away
11. 1.97 km W of Cobb, CaliforniaSun, Aug 18, 10:16 PM PDT · 15016 days ago · 3 km deep · 86 km away
12. 1.52 km NNW of Clearlake, CaliforniaSat, Aug 17, 10:16 PM PDT · 15017 days ago · 2 km deep · 81 km away
13. 2.03 km W of Cobb, CaliforniaSat, Aug 17, 9:26 PM PDT · 15017 days ago · 0 km deep · 87 km away
14. 1.613 km ENE of Clearlake Oaks, CaliforniaSat, Aug 17, 6:25 PM PDT · 15017 days ago · 5 km deep · 84 km away
15. 2.022 km WSW of Williams, CaliforniaSat, Aug 17, 12:31 PM PDT · 15017 days ago · 3 km deep · 90 km away
16. 2.16 km W of Cobb, CaliforniaSat, Aug 17, 12:41 AM PDT · 15018 days ago · 1 km deep · 85 km away
17. 2.08 km WSW of Cobb, CaliforniaFri, Aug 16, 3:32 PM PDT · 15018 days ago · 4 km deep · 88 km away
18. 2.05 km SW of Cobb, CaliforniaThu, Aug 15, 1:47 PM PDT · 15019 days ago · 2 km deep · 90 km away
19. 1.69 km NE of Hopland, CaliforniaThu, Aug 15, 6:26 AM PDT · 15019 days ago · 6 km deep · 55 km away
20. 1.90 km ESE of Redwood Valley, CaliforniaThu, Aug 15, 12:21 AM PDT · 15020 days ago · 6 km deep · 26 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc55197. Read Mon, Sep 28, 2026, 8:50 PM UTC.