M1.6 earthquake 12 km N of Brooktrails, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Jun 20, 1983, 5:59 AM PDT

UTC

1983-06-20 12:59:54 UTC

Depth

7.1 km (4.4 mi), shallow

Epicenter

39.554° N, 123.360° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 1.1 km in depth

Magnitude uncertainty

±0.23

Depth from

From location

Station coverage gap

112°

Stations used

10

• Brooktrails, CaliforniaPopulation 3,235. Forecast12 kmN
• Ukiah, CaliforniaPopulation 15,917. Forecast47 kmNNW
• Chico, CaliforniaPopulation 121,345. Forecast132 kmW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast762 kmNW

After

1. 1.53 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 8:10 AM PDT · 15809 days ago · 0 km deep · 84 km away
2. 2.62 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 8:14 AM PDT · 15809 days ago · 3 km deep · 85 km away
3. 2.43 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 8:17 AM PDT · 15809 days ago · 3 km deep · 84 km away
4. 1.73 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 8:28 AM PDT · 15809 days ago · 3 km deep · 84 km away
5. 3.26 km W of Cobb, CaliforniaMon, Jun 20, 11:50 AM PDT · 15809 days ago · 4 km deep · 95 km away
6. 1.65 km W of Cobb, CaliforniaMon, Jun 20, 12:20 PM PDT · 15809 days ago · 1 km deep · 96 km away
7. 1.86 km SW of Cobb, CaliforniaMon, Jun 20, 2:43 PM PDT · 15809 days ago · 1 km deep · 98 km away
8. 1.54 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 8:06 PM PDT · 15809 days ago · 3 km deep · 84 km away
9. 1.99 km WSW of Cobb, CaliforniaMon, Jun 20, 11:01 PM PDT · 15808 days ago · 1 km deep · 95 km away
10. 1.64 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 11:12 PM PDT · 15808 days ago · 4 km deep · 84 km away
11. 1.96 km S of Laytonville, CaliforniaTue, Jun 21, 3:05 AM PDT · 15808 days ago · 3 km deep · 14 km away
12. 1.613 km SE of Leggett, CaliforniaTue, Jun 21, 3:06 AM PDT · 15808 days ago · 0 km deep · 33 km away
13. 1.66 km S of Laytonville, CaliforniaTue, Jun 21, 3:09 AM PDT · 15808 days ago · 2 km deep · 14 km away
14. 1.65 km S of Laytonville, CaliforniaTue, Jun 21, 7:54 AM PDT · 15808 days ago · 4 km deep · 15 km away
15. 1.64 km S of Laytonville, CaliforniaTue, Jun 21, 7:54 AM PDT · 15808 days ago · 3 km deep · 15 km away
16. 1.96 km E of Clearlake Oaks, CaliforniaThu, Jun 23, 3:39 AM PDT · 15806 days ago · 2 km deep · 89 km away
17. 1.76 km W of Cobb, CaliforniaThu, Jun 23, 4:56 AM PDT · 15806 days ago · 3 km deep · 95 km away
18. 2.06 km WSW of Cobb, CaliforniaFri, Jun 24, 10:50 AM PDT · 15805 days ago · 3 km deep · 97 km away
19. 2.07 km S of Laytonville, CaliforniaSat, Jun 25, 3:07 AM PDT · 15804 days ago · 0 km deep · 14 km away
20. 1.57 km WSW of Cobb, CaliforniaSat, Jun 25, 3:09 AM PDT · 15804 days ago · 1 km deep · 96 km away
21. 1.714 km ENE of Potter Valley, CaliforniaSat, Jun 25, 4:54 PM PDT · 15804 days ago · -1 km deep · 39 km away
22. 2.519 km NE of Potter Valley, CaliforniaSat, Jun 25, 5:10 PM PDT · 15804 days ago · 7 km deep · 37 km away
23. 1.84 km WSW of Cobb, CaliforniaSun, Jun 26, 12:20 PM PDT · 15803 days ago · 2 km deep · 98 km away
24. 2.67 km WSW of Cobb, CaliforniaSun, Jun 26, 1:52 PM PDT · 15803 days ago · 1 km deep · 97 km away
25. 1.85 km N of Cobb, CaliforniaSun, Jun 26, 4:55 PM PDT · 15803 days ago · 0 km deep · 94 km away
26. 1.87 km WSW of Cobb, CaliforniaSun, Jun 26, 5:07 PM PDT · 15803 days ago · 2 km deep · 96 km away
27. 1.84 km E of Boonville, CaliforniaSun, Jun 26, 9:28 PM PDT · 15802 days ago · 7 km deep · 61 km away
28. 1.53 km WSW of Laytonville, CaliforniaSun, Jun 26, 10:10 PM PDT · 15802 days ago · 3 km deep · 19 km away
29. 1.84 km W of Cobb, CaliforniaMon, Jun 27, 12:02 AM PDT · 15802 days ago · 0 km deep · 96 km away
30. 2.57 km W of Cobb, CaliforniaMon, Jun 27, 9:28 PM PDT · 15801 days ago · 0 km deep · 95 km away
31. 1.69 km NE of Phillipsville, CaliforniaTue, Jun 28, 1:07 AM PDT · 15801 days ago · 30 km deep · 86 km away
32. 1.78 km WSW of Cobb, CaliforniaTue, Jun 28, 1:43 AM PDT · 15801 days ago · 4 km deep · 98 km away
33. 1.73 km W of Clear Lake Riviera, CaliforniaTue, Jun 28, 7:55 AM PDT · 15801 days ago · 5 km deep · 85 km away
34. 1.927 km WNW of Paskenta, CaliforniaTue, Jun 28, 6:25 PM PDT · 15801 days ago · 9 km deep · 61 km away
35. 1.77 km WSW of Cobb, CaliforniaTue, Jun 28, 9:09 PM PDT · 15800 days ago · 3 km deep · 97 km away
36. 2.012 km S of Laytonville, CaliforniaWed, Jun 29, 2:33 AM PDT · 15800 days ago · 0 km deep · 9 km away
37. 2.911 km S of Laytonville, CaliforniaWed, Jun 29, 3:01 AM PDT · 15800 days ago · 2 km deep · 9 km away
38. 1.97 km SE of Leggett, CaliforniaWed, Jun 29, 9:16 AM PDT · 15800 days ago · 2 km deep · 38 km away
39. 1.79 km SE of Leggett, CaliforniaWed, Jun 29, 11:52 AM PDT · 15800 days ago · 8 km deep · 37 km away
40. 1.95 km S of Laytonville, CaliforniaWed, Jun 29, 7:58 PM PDT · 15800 days ago · 3 km deep · 15 km away
41. 1.86 km SSW of Laytonville, CaliforniaWed, Jun 29, 7:58 PM PDT · 15800 days ago · 2 km deep · 16 km away
42. 1.64 km S of Laytonville, CaliforniaWed, Jun 29, 10:27 PM PDT · 15799 days ago · 3 km deep · 15 km away
43. 1.827 km WSW of Leggett, CaliforniaWed, Jun 29, 11:21 PM PDT · 15799 days ago · -1 km deep · 61 km away
44. 1.65 km SSE of Clear Lake Riviera, CaliforniaThu, Jun 30, 6:52 AM PDT · 15799 days ago · 4 km deep · 92 km away
45. 2.49 km WSW of Cobb, CaliforniaThu, Jun 30, 5:29 PM PDT · 15799 days ago · 2 km deep · 95 km away
46. 1.85 km SE of Covelo, CaliforniaThu, Jun 30, 7:32 PM PDT · 15799 days ago · 4 km deep · 26 km away
47. 2.36 km W of Cobb, CaliforniaFri, Jul 1, 12:55 AM PDT · 15798 days ago · 3 km deep · 95 km away
48. 2.18 km WSW of Cobb, CaliforniaFri, Jul 1, 5:09 AM PDT · 15798 days ago · 0 km deep · 96 km away
49. 2.15 km S of Laytonville, CaliforniaFri, Jul 1, 6:22 AM PDT · 15798 days ago · 3 km deep · 15 km away
50. 1.85 km SSW of Laytonville, CaliforniaFri, Jul 1, 6:52 AM PDT · 15798 days ago · 1 km deep · 15 km away
51. 1.67 km NW of Cobb, CaliforniaFri, Jul 1, 8:12 AM PDT · 15798 days ago · -1 km deep · 91 km away
52. 1.66 km WSW of Cobb, CaliforniaSat, Jul 2, 5:07 AM PDT · 15797 days ago · 0 km deep · 98 km away
53. 1.511 km S of Laytonville, CaliforniaSat, Jul 2, 11:13 AM PDT · 15797 days ago · 1 km deep · 10 km away
54. 1.711 km S of Laytonville, CaliforniaSat, Jul 2, 3:19 PM PDT · 15797 days ago · -1 km deep · 10 km away
55. 2.427 km WNW of Paskenta, CaliforniaSat, Jul 2, 5:46 PM PDT · 15797 days ago · 10 km deep · 61 km away
56. 2.13 km NE of Redway, CaliforniaSun, Jul 3, 1:30 AM PDT · 15796 days ago · 20 km deep · 75 km away
57. 1.77 km WSW of Cobb, CaliforniaSun, Jul 3, 2:31 AM PDT · 15796 days ago · 1 km deep · 96 km away
58. 1.54 km NW of Redwood Valley, CaliforniaSun, Jul 3, 6:13 AM PDT · 15796 days ago · 4 km deep · 30 km away
59. 2.07 km W of Cobb, CaliforniaSun, Jul 3, 12:09 PM PDT · 15796 days ago · 1 km deep · 95 km away
60. 1.78 km NE of Hopland, CaliforniaMon, Jul 4, 12:41 AM PDT · 15795 days ago · 5 km deep · 65 km away

The first 60 of at least 199.

Before

1. 1.63 km W of Clear Lake Riviera, CaliforniaMon, Jun 20, 4:41 AM PDT · 15809 days ago · 4 km deep · 84 km away
2. 1.53 km W of Clear Lake Riviera, CaliforniaSun, Jun 19, 5:21 PM PDT · 15810 days ago · 4 km deep · 84 km away
3. 1.99 km WSW of Cobb, CaliforniaSun, Jun 19, 3:20 PM PDT · 15810 days ago · 0 km deep · 95 km away
4. 2.52 km W of Clear Lake Riviera, CaliforniaSun, Jun 19, 11:13 AM PDT · 15810 days ago · 4 km deep · 84 km away
5. 2.16 km WSW of Cobb, CaliforniaSun, Jun 19, 7:43 AM PDT · 15810 days ago · 4 km deep · 97 km away
6. 2.13 km ESE of Clearlake, CaliforniaSat, Jun 18, 8:21 PM PDT · 15811 days ago · 3 km deep · 95 km away
7. 1.66 km W of Cobb, CaliforniaSat, Jun 18, 6:21 AM PDT · 15811 days ago · 3 km deep · 95 km away
8. 2.015 km E of Potter Valley, CaliforniaFri, Jun 17, 5:31 AM PDT · 15812 days ago · 9 km deep · 44 km away
9. 1.519 km NE of Upper Lake, CaliforniaThu, Jun 16, 8:44 PM PDT · 15813 days ago · 7 km deep · 61 km away
10. 2.09 km WSW of Cobb, CaliforniaThu, Jun 16, 8:38 AM PDT · 15813 days ago · 2 km deep · 96 km away
11. 1.66 km W of Cobb, CaliforniaThu, Jun 16, 2:27 AM PDT · 15813 days ago · 3 km deep · 95 km away
12. 1.60 km S of Redwood Valley, CaliforniaWed, Jun 15, 5:33 PM PDT · 15814 days ago · 5 km deep · 35 km away
13. 2.00 km SSW of Redwood Valley, CaliforniaWed, Jun 15, 1:59 PM PDT · 15814 days ago · 6 km deep · 35 km away
14. 2.11 km SSW of Redwood Valley, CaliforniaWed, Jun 15, 9:54 AM PDT · 15814 days ago · 7 km deep · 35 km away
15. 1.79 km WSW of Cobb, CaliforniaTue, Jun 14, 2:55 PM PDT · 15815 days ago · 2 km deep · 96 km away
16. 1.8near the coast of Northern CaliforniaTue, Jun 14, 1:06 PM PDT · 15815 days ago · 9 km deep · 9 km away
17. 1.89 km WSW of Cobb, CaliforniaTue, Jun 14, 12:06 PM PDT · 15815 days ago · 1 km deep · 96 km away
18. 1.9Northern CaliforniaTue, Jun 14, 4:53 AM PDT · 15815 days ago · 3 km deep · 95 km away
19. 2.97 km W of Cobb, CaliforniaMon, Jun 13, 10:07 PM PDT · 15815 days ago · 4 km deep · 95 km away
20. 2.97 km WSW of Cobb, CaliforniaMon, Jun 13, 7:22 PM PDT · 15816 days ago · 2 km deep · 97 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1097209. Read Thu, Oct 1, 2026, 3:21 PM UTC.