M1.6 earthquake 13 km NNE of Angwin, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Aug 11, 1984, 4:27 PM PDT

UTC

1984-08-11 23:27:10 UTC

Depth

8.2 km (5.1 mi), shallow

Epicenter

38.687° N, 122.402° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.7 km horizontally, 2.8 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

156°

Stations used

9

• Angwin, CaliforniaPopulation 3,051. Forecast13 kmNNE
• Clearlake, CaliforniaPopulation 15,182. Forecast36 kmSSE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast636 kmNW

After

1. 2.619 km ENE of Potter Valley, CaliforniaMon, Aug 13, 4:23 AM PDT · 15391 days ago · 10 km deep · 87 km away
2. 1.918 km ENE of Potter Valley, CaliforniaMon, Aug 13, 4:24 AM PDT · 15391 days ago · 5 km deep · 86 km away
3. 1.810 km S of Willows, CaliforniaTue, Aug 14, 2:42 AM PDT · 15390 days ago · 20 km deep · 85 km away
4. 2.110 km WNW of Lakeport, CaliforniaTue, Aug 14, 11:42 PM PDT · 15389 days ago · 30 km deep · 69 km away
5. 1.75 km SW of Cobb, CaliforniaWed, Aug 15, 7:30 AM PDT · 15389 days ago · 0 km deep · 34 km away
6. 1.66 km W of Cobb, CaliforniaWed, Aug 15, 7:34 AM PDT · 15389 days ago · 3 km deep · 37 km away
7. 2.68 km WSW of Cobb, CaliforniaWed, Aug 15, 8:51 AM PDT · 15389 days ago · 3 km deep · 37 km away
8. 1.76 km W of Cobb, CaliforniaThu, Aug 16, 9:21 AM PDT · 15388 days ago · 3 km deep · 38 km away
9. 1.76 km W of Cobb, CaliforniaFri, Aug 17, 6:16 AM PDT · 15387 days ago · 3 km deep · 37 km away
10. 2.13 km SE of Clearlake Oaks, CaliforniaFri, Aug 17, 3:26 PM PDT · 15386 days ago · 2 km deep · 40 km away
11. 1.612 km ESE of Hidden Valley Lake, CaliforniaSat, Aug 18, 3:00 AM PDT · 15386 days ago · 1 km deep · 7 km away
12. 1.66 km W of Cobb, CaliforniaSun, Aug 19, 9:10 AM PDT · 15385 days ago · 3 km deep · 37 km away
13. 1.85 km SW of Cobb, CaliforniaMon, Aug 20, 10:47 AM PDT · 15384 days ago · 1 km deep · 33 km away
14. 2.35 km WSW of Cobb, CaliforniaMon, Aug 20, 11:31 AM PDT · 15384 days ago · 1 km deep · 35 km away
15. 1.917 km WSW of Guinda, CaliforniaMon, Aug 20, 6:19 PM PDT · 15383 days ago · 5 km deep · 8 km away
16. 1.65 km E of Healdsburg, CaliforniaMon, Aug 20, 11:05 PM PDT · 15383 days ago · 1 km deep · 37 km away
17. 2.45 km SW of Cottonwood, CaliforniaTue, Aug 21, 3:24 AM PDT · 15383 days ago · 1 km deep · 35 km away
18. 1.79 km WSW of Cobb, CaliforniaTue, Aug 21, 4:50 AM PDT · 15383 days ago · 2 km deep · 39 km away
19. 1.75 km SW of Cobb, CaliforniaThu, Aug 23, 1:27 AM PDT · 15381 days ago · 0 km deep · 35 km away
20. 1.86 km SSW of Antioch, CaliforniaThu, Aug 23, 7:42 AM PDT · 15381 days ago · 5 km deep · 96 km away
21. 2.57 km WSW of Cobb, CaliforniaFri, Aug 24, 12:15 AM PDT · 15380 days ago · 0 km deep · 38 km away
22. 2.04 km WSW of Cobb, CaliforniaFri, Aug 24, 2:41 AM PDT · 15380 days ago · 1 km deep · 35 km away
23. 1.57 km W of Cobb, CaliforniaSat, Aug 25, 12:32 AM PDT · 15379 days ago · 1 km deep · 38 km away
24. 2.06 km WSW of Cobb, CaliforniaSat, Aug 25, 7:03 AM PDT · 15379 days ago · 0 km deep · 36 km away
25. 2.93 km E of Redwood Valley, CaliforniaSat, Aug 25, 10:26 AM PDT · 15379 days ago · 6 km deep · 92 km away
26. 1.57 km W of Cobb, CaliforniaSun, Aug 26, 5:23 AM PDT · 15378 days ago · 3 km deep · 38 km away
27. 1.816 km NNE of Upper Lake, CaliforniaSun, Aug 26, 5:39 AM PDT · 15378 days ago · 7 km deep · 77 km away
28. 2.46 km WSW of Cobb, CaliforniaSun, Aug 26, 8:44 PM PDT · 15377 days ago · 1 km deep · 37 km away
29. 1.710 km NNE of Cloverdale, CaliforniaSun, Aug 26, 11:47 PM PDT · 15377 days ago · 5 km deep · 56 km away
30. 1.513 km N of Pittsburg, CaliforniaSun, Aug 26, 11:59 PM PDT · 15377 days ago · 19 km deep · 75 km away
31. 1.911 km N of Pittsburg, CaliforniaMon, Aug 27, 6:55 AM PDT · 15377 days ago · 21 km deep · 78 km away
32. 1.65 km W of Cobb, CaliforniaMon, Aug 27, 12:02 PM PDT · 15377 days ago · 0 km deep · 36 km away
33. 2.48 km NNE of Hopland, CaliforniaMon, Aug 27, 12:10 PM PDT · 15377 days ago · 1 km deep · 71 km away
34. 1.58 km S of Calistoga, CaliforniaMon, Aug 27, 2:07 PM PDT · 15377 days ago · 7 km deep · 26 km away
35. 2.05 km SW of Cobb, CaliforniaTue, Aug 28, 2:55 AM PDT · 15376 days ago · 0 km deep · 34 km away
36. 2.66 km WSW of Cobb, CaliforniaTue, Aug 28, 3:18 AM PDT · 15376 days ago · -1 km deep · 35 km away
37. 2.13 km W of Cloverdale, CaliforniaTue, Aug 28, 8:14 AM PDT · 15376 days ago · 17 km deep · 58 km away
38. 1.76 km WSW of Cobb, CaliforniaTue, Aug 28, 8:25 AM PDT · 15376 days ago · 3 km deep · 37 km away
39. 1.76 km WSW of Cobb, CaliforniaTue, Aug 28, 8:30 AM PDT · 15376 days ago · 3 km deep · 37 km away
40. 1.78 km NNE of Hopland, CaliforniaTue, Aug 28, 4:38 PM PDT · 15375 days ago · 0 km deep · 72 km away
41. 2.46 km WSW of Cobb, CaliforniaTue, Aug 28, 5:03 PM PDT · 15375 days ago · 3 km deep · 37 km away
42. 1.66 km WSW of Cobb, CaliforniaTue, Aug 28, 5:05 PM PDT · 15375 days ago · 3 km deep · 37 km away
43. 1.610 km SW of Hopland, CaliforniaTue, Aug 28, 11:00 PM PDT · 15375 days ago · 4 km deep · 74 km away
44. 2.010 km WSW of Cobb, CaliforniaWed, Aug 29, 12:03 PM PDT · 15375 days ago · 2 km deep · 40 km away
45. 1.710 km WSW of Cobb, CaliforniaWed, Aug 29, 12:03 PM PDT · 15375 days ago · 2 km deep · 40 km away
46. 1.51 km NNW of Calpella, CaliforniaWed, Aug 29, 5:20 PM PDT · 15374 days ago · 6 km deep · 93 km away
47. 1.919 km NNE of Upper Lake, CaliforniaThu, Aug 30, 3:54 AM PDT · 15374 days ago · 5 km deep · 81 km away
48. 2.04 km NE of Clearlake, CaliforniaThu, Aug 30, 9:38 AM PDT · 15374 days ago · 2 km deep · 38 km away
49. 1.58 km W of Cobb, CaliforniaThu, Aug 30, 11:10 AM PDT · 15374 days ago · 1 km deep · 39 km away
50. 1.57 km W of Cobb, CaliforniaThu, Aug 30, 4:37 PM PDT · 15373 days ago · 5 km deep · 38 km away
51. 2.416 km W of Williams, CaliforniaThu, Aug 30, 6:56 PM PDT · 15373 days ago · 1 km deep · 51 km away
52. 2.34 km WNW of Lucas Valley-Marinwood, CaliforniaFri, Aug 31, 11:35 AM PDT · 15373 days ago · 3 km deep · 73 km away
53. 1.76 km W of Cobb, CaliforniaFri, Aug 31, 9:47 PM PDT · 15372 days ago · 1 km deep · 38 km away
54. 1.811 km SW of Hopland, CaliforniaSun, Sep 2, 12:16 AM PDT · 15371 days ago · 4 km deep · 74 km away
55. 1.56 km W of Cobb, CaliforniaSun, Sep 2, 6:05 AM PDT · 15371 days ago · 1 km deep · 38 km away
56. 1.66 km W of Cobb, CaliforniaSun, Sep 2, 5:39 PM PDT · 15370 days ago · 3 km deep · 37 km away
57. 2.215 km ESE of Hidden Valley Lake, CaliforniaMon, Sep 3, 12:34 AM PDT · 15370 days ago · 0 km deep · 6 km away
58. 2.75 km N of Redwood Valley, CaliforniaMon, Sep 3, 5:48 AM PDT · 15370 days ago · 42 km deep · 98 km away
59. 1.65 km W of Cobb, CaliforniaMon, Sep 3, 12:41 PM PDT · 15370 days ago · 0 km deep · 37 km away
60. 1.65 km SW of Moskowite Corner, CaliforniaWed, Sep 5, 6:39 AM PDT · 15368 days ago · 0 km deep · 34 km away

The first 60 of 167.

Before

1. 2.15 km SW of Cobb, CaliforniaSat, Aug 11, 4:02 PM PDT · 15392 days ago · 1 km deep · 34 km away
2. 1.84 km W of Cobb, CaliforniaSat, Aug 11, 2:52 AM PDT · 15393 days ago · -1 km deep · 36 km away
3. 1.84 km W of Cobb, CaliforniaFri, Aug 10, 2:10 PM PDT · 15394 days ago · 0 km deep · 36 km away
4. 2.48 km SSE of Dunnigan, CaliforniaFri, Aug 10, 10:47 AM PDT · 15394 days ago · 9 km deep · 45 km away
5. 2.07 km W of Cobb, CaliforniaFri, Aug 10, 9:26 AM PDT · 15394 days ago · 3 km deep · 38 km away
6. 1.74 km W of Redwood Valley, CaliforniaFri, Aug 10, 6:57 AM PDT · 15394 days ago · 2 km deep · 97 km away
7. 1.99 km WSW of Cobb, CaliforniaThu, Aug 9, 11:40 PM PDT · 15394 days ago · 1 km deep · 38 km away
8. 1.76 km W of Cobb, CaliforniaThu, Aug 9, 6:34 AM PDT · 15395 days ago · 1 km deep · 37 km away
9. 2.73 km ENE of Lakeport, CaliforniaWed, Aug 8, 10:06 AM PDT · 15396 days ago · 2 km deep · 58 km away
10. 1.74 km WSW of Cobb, CaliforniaWed, Aug 8, 3:20 AM PDT · 15396 days ago · 1 km deep · 35 km away
11. 2.46 km W of Cobb, CaliforniaWed, Aug 8, 2:10 AM PDT · 15396 days ago · 3 km deep · 37 km away
12. 1.96 km WSW of Cobb, CaliforniaTue, Aug 7, 12:52 PM PDT · 15397 days ago · 3 km deep · 36 km away
13. 1.66 km W of Cobb, CaliforniaMon, Aug 6, 7:56 AM PDT · 15398 days ago · 2 km deep · 37 km away
14. 1.920 km NNE of Upper Lake, CaliforniaSun, Aug 5, 11:53 PM PDT · 15398 days ago · 7 km deep · 82 km away
15. 1.56 km WSW of Cobb, CaliforniaSat, Aug 4, 10:45 PM PDT · 15399 days ago · 3 km deep · 36 km away
16. 1.613 km NNW of Moskowite Corner, CaliforniaSat, Aug 4, 8:23 PM PDT · 15399 days ago · 15 km deep · 19 km away
17. 2.52 km NE of Pacheco, CaliforniaSat, Aug 4, 5:41 PM PDT · 15399 days ago · 9 km deep · 82 km away
18. 1.88 km WSW of Cobb, CaliforniaSat, Aug 4, 3:40 PM PDT · 15399 days ago · 3 km deep · 38 km away
19. 1.52 km WNW of Redwood Valley, CaliforniaFri, Aug 3, 9:30 PM PDT · 15400 days ago · 4 km deep · 97 km away
20. 1.94 km W of Cobb, CaliforniaWed, Aug 1, 2:32 PM PDT · 15403 days ago · -1 km deep · 36 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1119138. Read Sat, Oct 3, 2026, 9:28 AM UTC.