M1.9 earthquake 8 km W of Cobb, California

Magnitude

1.9 (md), micro

Local time

Sun, Apr 22, 1984, 6:44 AM PST

UTC

1984-04-22 14:44:11 UTC

Depth

0.2 km (0.1 mi), shallow

Epicenter

38.825° N, 122.817° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

44°

Stations used

19

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast670 kmNW

After

1. 1.86 km WSW of Cobb, CaliforniaThu, May 3, 10:24 AM PDT · 15482 days ago · 3 km deep · 3 km away
2. 1.87 km W of Cobb, CaliforniaThu, May 3, 10:59 AM PDT · 15482 days ago · 3 km deep · 1 km away
3. 1.66 km W of Cobb, CaliforniaThu, May 3, 9:04 PM PDT · 15482 days ago · 3 km deep · 1 km away
4. 1.66 km W of Potter Valley, CaliforniaThu, May 3, 9:18 PM PDT · 15482 days ago · 11 km deep · 65 km away
5. 1.77 km W of Cobb, CaliforniaThu, May 3, 10:13 PM PDT · 15482 days ago · 3 km deep · 2 km away
6. 2.213 km N of Brooktrails, CaliforniaFri, May 4, 6:35 AM PDT · 15481 days ago · 7 km deep · 95 km away
7. 1.67 km WSW of Cobb, CaliforniaFri, May 4, 10:38 PM PDT · 15481 days ago · 3 km deep · 3 km away
8. 1.68 km WSW of Cobb, CaliforniaSat, May 5, 12:51 PM PDT · 15480 days ago · 3 km deep · 3 km away
9. 1.68 km WSW of Cobb, CaliforniaSun, May 6, 1:45 PM PDT · 15479 days ago · 4 km deep · 2 km away
10. 2.87 km W of Cobb, CaliforniaSun, May 6, 1:55 PM PDT · 15479 days ago · 3 km deep · 1 km away
11. 1.52 km E of Calpella, CaliforniaSun, May 6, 2:58 PM PDT · 15479 days ago · 4 km deep · 55 km away
12. 2.16 km W of Cobb, CaliforniaSun, May 6, 8:13 PM PDT · 15479 days ago · 3 km deep · 2 km away
13. 1.56 km W of Potter Valley, CaliforniaMon, May 7, 2:27 AM PDT · 15478 days ago · 8 km deep · 65 km away
14. 2.47 km WSW of Cobb, CaliforniaMon, May 7, 9:05 AM PDT · 15478 days ago · 0 km deep · 3 km away
15. 2.75 km WSW of Vacaville, CaliforniaMon, May 7, 11:20 AM PDT · 15478 days ago · 32 km deep · 87 km away
16. 2.17 km W of Cobb, CaliforniaMon, May 7, 12:50 PM PDT · 15478 days ago · 2 km deep · 1 km away
17. 1.67 km W of Cobb, CaliforniaTue, May 8, 12:05 AM PDT · 15478 days ago · 1 km deep · 1 km away
18. 2.25 km SW of Cobb, CaliforniaTue, May 8, 2:50 PM PDT · 15477 days ago · 0 km deep · 6 km away
19. 1.60 km NE of Larkfield-Wikiup, CaliforniaTue, May 8, 6:06 PM PDT · 15477 days ago · 3 km deep · 35 km away
20. 1.77 km W of Cobb, CaliforniaWed, May 9, 11:27 AM PDT · 15476 days ago · 4 km deep · 1 km away
21. 1.76 km SW of Cobb, CaliforniaWed, May 9, 11:40 AM PDT · 15476 days ago · 0 km deep · 6 km away
22. 1.87 km W of Cobb, CaliforniaWed, May 9, 5:23 PM PDT · 15476 days ago · 3 km deep · 1 km away
23. 1.56 km W of Cobb, CaliforniaThu, May 10, 3:42 AM PDT · 15475 days ago · 2 km deep · 2 km away
24. 1.59 km W of Cobb, CaliforniaThu, May 10, 10:03 PM PDT · 15475 days ago · 2 km deep · 3 km away
25. 1.88 km SE of Willits, CaliforniaThu, May 10, 10:39 PM PDT · 15475 days ago · 4 km deep · 71 km away
26. 1.77 km WSW of Cobb, CaliforniaSat, May 12, 12:09 AM PDT · 15474 days ago · 3 km deep · 3 km away
27. 2.25 km ESE of Manchester, CaliforniaSat, May 12, 3:30 PM PDT · 15473 days ago · 0 km deep · 72 km away
28. 1.86 km W of Cobb, CaliforniaSun, May 13, 7:04 AM PDT · 15472 days ago · 3 km deep · 2 km away
29. 1.73 km N of Clearlake, CaliforniaSun, May 13, 7:38 AM PDT · 15472 days ago · 0 km deep · 24 km away
30. 1.620 km NNE of Upper Lake, CaliforniaSun, May 13, 10:48 AM PDT · 15472 days ago · 6 km deep · 58 km away
31. 1.814 km SE of Laytonville, CaliforniaMon, May 14, 9:27 AM PDT · 15471 days ago · 0 km deep · 98 km away
32. 1.66 km WSW of Cobb, CaliforniaMon, May 14, 10:50 AM PDT · 15471 days ago · 3 km deep · 3 km away
33. 1.75 km WSW of Rutherford, CaliforniaTue, May 15, 5:05 AM PDT · 15470 days ago · 0 km deep · 52 km away
34. 1.77 km WSW of Cobb, CaliforniaTue, May 15, 12:15 PM PDT · 15470 days ago · 3 km deep · 3 km away
35. 1.816 km ENE of Potter Valley, CaliforniaTue, May 15, 6:36 PM PDT · 15470 days ago · 6 km deep · 64 km away
36. 2.34 km SW of Cobb, CaliforniaWed, May 16, 5:35 AM PDT · 15469 days ago · 0 km deep · 7 km away
37. 1.67 km W of Cobb, CaliforniaWed, May 16, 8:08 AM PDT · 15469 days ago · 3 km deep · 2 km away
38. 1.96 km W of Cobb, CaliforniaThu, May 17, 12:30 AM PDT · 15469 days ago · 2 km deep · 2 km away
39. 1.66 km W of Cobb, CaliforniaThu, May 17, 12:31 AM PDT · 15469 days ago · 3 km deep · 2 km away
40. 1.67 km WSW of Cobb, CaliforniaThu, May 17, 5:43 PM PDT · 15468 days ago · 2 km deep · 2 km away
41. 1.96 km W of Cobb, CaliforniaThu, May 17, 7:40 PM PDT · 15468 days ago · 3 km deep · 2 km away
42. 2.37 km WSW of Cobb, CaliforniaThu, May 17, 8:10 PM PDT · 15468 days ago · 0 km deep · 3 km away
43. 1.93 km SE of Calpella, CaliforniaFri, May 18, 1:59 AM PDT · 15468 days ago · 5 km deep · 53 km away
44. 1.67 km E of Hidden Valley Lake, CaliforniaFri, May 18, 10:32 AM PDT · 15467 days ago · 7 km deep · 30 km away
45. 1.77 km WSW of Cobb, CaliforniaFri, May 18, 11:44 AM PDT · 15467 days ago · 0 km deep · 3 km away
46. 1.8Northern CaliforniaFri, May 18, 10:03 PM PDT · 15467 days ago · 4 km deep · 24 km away
47. 3.05 km SW of Cobb, CaliforniaSat, May 19, 12:08 AM PDT · 15467 days ago · 0 km deep · 7 km away
48. 1.96 km W of Cobb, CaliforniaSat, May 19, 2:36 AM PDT · 15466 days ago · 3 km deep · 2 km away
49. 1.525 km SE of Covelo, CaliforniaSat, May 19, 2:39 PM PDT · 15466 days ago · 4 km deep · 90 km away
50. 1.6Northern CaliforniaSun, May 20, 5:22 PM PDT · 15465 days ago · 0 km deep · 36 km away
51. 1.87 km S of Calistoga, CaliforniaSun, May 20, 6:46 PM PDT · 15465 days ago · 1 km deep · 41 km away
52. 2.56 km W of Cobb, CaliforniaMon, May 21, 4:00 AM PDT · 15464 days ago · 2 km deep · 2 km away
53. 2.16 km W of Cobb, CaliforniaMon, May 21, 4:00 AM PDT · 15464 days ago · 2 km deep · 2 km away
54. 1.67 km WSW of Cobb, CaliforniaMon, May 21, 10:35 AM PDT · 15464 days ago · 4 km deep · 3 km away
55. 1.57 km WSW of Cobb, CaliforniaMon, May 21, 12:35 PM PDT · 15464 days ago · 3 km deep · 3 km away
56. 1.75 km ESE of Healdsburg, CaliforniaMon, May 21, 1:17 PM PDT · 15464 days ago · 4 km deep · 25 km away
57. 2.47 km WSW of Cobb, CaliforniaMon, May 21, 7:12 PM PDT · 15464 days ago · 1 km deep · 3 km away
58. 1.712 km S of Comptche, CaliforniaTue, May 22, 4:32 AM PDT · 15463 days ago · 3 km deep · 77 km away
59. 2.112 km S of Comptche, CaliforniaTue, May 22, 5:38 AM PDT · 15463 days ago · 0 km deep · 76 km away
60. 1.55 km N of Windsor, CaliforniaTue, May 22, 2:47 PM PDT · 15463 days ago · 7 km deep · 25 km away

The first 60 of 170.

From the USGS Earthquake Hazards Program and its partner networks, event nc16133. Read Tue, Sep 22, 2026, 8:50 PM UTC.