M1.5 earthquake 5 km W of Cobb, California

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Mar 30, 1984, 10:37 AM PST

UTC

1984-03-30 18:37:36 UTC

Depth

-0.2 km (-0.1 mi), shallow

Epicenter

38.832° N, 122.787° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.3 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

88°

Stations used

11

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast20 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast669 kmNW

After

1. 1.76 km W of Cobb, CaliforniaFri, Mar 30, 10:38 AM PST · 15528 days ago · 0 km deep · 1 km away
2. 2.39 km WSW of Cobb, CaliforniaFri, Mar 30, 12:17 PM PST · 15528 days ago · 1 km deep · 5 km away
3. 2.18 km WSW of Cobb, CaliforniaFri, Mar 30, 12:20 PM PST · 15528 days ago · 3 km deep · 4 km away
4. 1.67 km WSW of Cobb, CaliforniaFri, Mar 30, 2:48 PM PST · 15527 days ago · 0 km deep · 4 km away
5. 1.65 km SW of Cobb, CaliforniaFri, Mar 30, 4:02 PM PST · 15527 days ago · 1 km deep · 5 km away
6. 1.720 km NE of Potter Valley, CaliforniaFri, Mar 30, 7:29 PM PST · 15527 days ago · 5 km deep · 70 km away
7. 1.65 km W of Cobb, CaliforniaSat, Mar 31, 6:03 AM PST · 15527 days ago · 0 km deep · 2 km away
8. 1.66 km W of Cobb, CaliforniaSat, Mar 31, 12:30 PM PST · 15527 days ago · 3 km deep · 2 km away
9. 2.0Northern CaliforniaSat, Mar 31, 8:06 PM PST · 15526 days ago · 1 km deep · 5 km away
10. 2.48 km W of Cobb, CaliforniaSun, Apr 1, 4:31 PM PST · 15525 days ago · 0 km deep · 4 km away
11. 1.66 km WSW of Cobb, CaliforniaSun, Apr 1, 10:24 PM PST · 15525 days ago · 1 km deep · 3 km away
12. 1.77 km WSW of Cobb, CaliforniaMon, Apr 2, 1:32 AM PST · 15525 days ago · 3 km deep · 4 km away
13. 1.67 km W of Cobb, CaliforniaMon, Apr 2, 9:34 AM PST · 15525 days ago · 3 km deep · 3 km away
14. 1.59 km WSW of Cobb, CaliforniaMon, Apr 2, 10:29 AM PST · 15525 days ago · 1 km deep · 5 km away
15. 1.59 km ENE of Brooktrails, CaliforniaMon, Apr 2, 10:30 PM PST · 15524 days ago · 10 km deep · 85 km away
16. 1.96 km W of Cobb, CaliforniaMon, Apr 2, 10:59 PM PST · 15524 days ago · 3 km deep · 2 km away
17. 1.83 km WNW of Soda Bay, CaliforniaTue, Apr 3, 2:12 AM PST · 15524 days ago · 5 km deep · 21 km away
18. 1.58 km WSW of Cobb, CaliforniaTue, Apr 3, 8:30 AM PST · 15524 days ago · 3 km deep · 4 km away
19. 2.07 km W of Cobb, CaliforniaTue, Apr 3, 1:47 PM PST · 15523 days ago · 3 km deep · 3 km away
20. 1.83 km WNW of Soda Bay, CaliforniaTue, Apr 3, 2:45 PM PST · 15523 days ago · 6 km deep · 21 km away
21. 2.63 km NNW of Dunnigan, CaliforniaTue, Apr 3, 6:03 PM PST · 15523 days ago · 7 km deep · 70 km away
22. 2.3Northern CaliforniaWed, Apr 4, 10:56 AM PST · 15523 days ago · 12 km deep · 21 km away
23. 2.86 km WSW of Cobb, CaliforniaWed, Apr 4, 10:58 AM PST · 15523 days ago · 3 km deep · 3 km away
24. 2.66 km W of Cobb, CaliforniaWed, Apr 4, 11:00 AM PST · 15523 days ago · 0 km deep · 3 km away
25. 2.06 km WSW of Cobb, CaliforniaWed, Apr 4, 11:12 AM PST · 15523 days ago · 3 km deep · 3 km away
26. 1.718 km NNE of Upper Lake, CaliforniaWed, Apr 4, 7:35 PM PST · 15522 days ago · 9 km deep · 55 km away
27. 1.78 km SE of Willits, CaliforniaThu, Apr 5, 12:19 AM PST · 15522 days ago · -1 km deep · 72 km away
28. 1.66 km W of Cobb, CaliforniaThu, Apr 5, 10:42 AM PST · 15522 days ago · 3 km deep · 2 km away
29. 1.69 km ESE of Willits, CaliforniaFri, Apr 6, 5:45 AM PST · 15521 days ago · 6 km deep · 72 km away
30. 2.18 km SE of Willits, CaliforniaFri, Apr 6, 10:03 PM PST · 15520 days ago · 2 km deep · 72 km away
31. 1.69 km WSW of Cobb, CaliforniaSat, Apr 7, 12:06 AM PST · 15520 days ago · 2 km deep · 5 km away
32. 1.75 km WSW of Cobb, CaliforniaSat, Apr 7, 5:57 PM PST · 15519 days ago · 0 km deep · 3 km away
33. 1.69 km WSW of Cobb, CaliforniaSat, Apr 7, 11:06 PM PST · 15519 days ago · 7 km deep · 5 km away
34. 1.87 km WSW of Cobb, CaliforniaSun, Apr 8, 12:15 AM PST · 15519 days ago · 0 km deep · 4 km away
35. 1.65 km E of Lakeport, CaliforniaSun, Apr 8, 2:57 PM PST · 15518 days ago · 5 km deep · 24 km away
36. 1.55 km SSW of Boonville, CaliforniaSun, Apr 8, 8:40 PM PST · 15518 days ago · 1 km deep · 55 km away
37. 1.616 km ENE of Potter Valley, CaliforniaMon, Apr 9, 10:30 AM PST · 15518 days ago · 8 km deep · 63 km away
38. 2.99 km SE of Willits, CaliforniaMon, Apr 9, 2:05 PM PST · 15517 days ago · 4 km deep · 72 km away
39. 1.63 km ENE of Brooktrails, CaliforniaMon, Apr 9, 3:46 PM PST · 15517 days ago · 4 km deep · 85 km away
40. 1.99 km W of Cobb, CaliforniaMon, Apr 9, 6:58 PM PST · 15517 days ago · -1 km deep · 4 km away
41. 1.66 km WSW of Cobb, CaliforniaMon, Apr 9, 8:00 PM PST · 15517 days ago · 0 km deep · 3 km away
42. 1.66 km WSW of Cobb, CaliforniaMon, Apr 9, 8:01 PM PST · 15517 days ago · 0 km deep · 3 km away
43. 3.06 km W of Cobb, CaliforniaMon, Apr 9, 8:02 PM PST · 15517 days ago · 0 km deep · 2 km away
44. 2.86 km WSW of Cobb, CaliforniaMon, Apr 9, 8:02 PM PST · 15517 days ago · 0 km deep · 3 km away
45. 2.57 km WSW of Cobb, CaliforniaMon, Apr 9, 8:02 PM PST · 15517 days ago · 0 km deep · 3 km away
46. 1.66 km S of Hopland, CaliforniaMon, Apr 9, 8:04 PM PST · 15517 days ago · 4 km deep · 30 km away
47. 1.77 km WSW of Cobb, CaliforniaMon, Apr 9, 8:06 PM PST · 15517 days ago · 0 km deep · 4 km away
48. 1.65 km W of Cobb, CaliforniaMon, Apr 9, 8:30 PM PST · 15517 days ago · 0 km deep · 1 km away
49. 1.513 km W of Cazadero, CaliforniaMon, Apr 9, 9:25 PM PST · 15517 days ago · 4 km deep · 51 km away
50. 1.98 km SE of Willits, CaliforniaMon, Apr 9, 11:05 PM PST · 15517 days ago · 4 km deep · 72 km away
51. 2.09 km WSW of Cobb, CaliforniaTue, Apr 10, 5:55 AM PST · 15517 days ago · 2 km deep · 5 km away
52. 1.75 km W of Cobb, CaliforniaTue, Apr 10, 11:10 AM PST · 15517 days ago · 3 km deep · 1 km away
53. 1.58 km SE of Willits, CaliforniaTue, Apr 10, 6:53 PM PST · 15516 days ago · 6 km deep · 72 km away
54. 1.5Northern CaliforniaTue, Apr 10, 10:53 PM PST · 15516 days ago · 6 km deep · 32 km away
55. 1.65 km WSW of Cobb, CaliforniaWed, Apr 11, 12:00 AM PST · 15516 days ago · 0 km deep · 4 km away
56. 1.85 km WSW of Cobb, CaliforniaWed, Apr 11, 1:13 AM PST · 15516 days ago · 0 km deep · 4 km away
57. 1.68 km WSW of Cobb, CaliforniaWed, Apr 11, 7:03 AM PST · 15516 days ago · 0 km deep · 4 km away
58. 2.48 km WSW of Cobb, CaliforniaWed, Apr 11, 7:05 AM PST · 15516 days ago · -1 km deep · 4 km away
59. 1.85 km W of Cobb, CaliforniaWed, Apr 11, 9:09 PM PST · 15515 days ago · 0 km deep · 0 km away
60. 2.67 km NW of Cobb, CaliforniaWed, Apr 11, 11:26 PM PST · 15515 days ago · 3 km deep · 5 km away

The first 60 of 166.

Before

1. 2.16 km NNE of Clearlake Oaks, CaliforniaFri, Mar 30, 2:59 AM PST · 15528 days ago · 6 km deep · 31 km away
2. 1.66 km NNE of Benicia, CaliforniaThu, Mar 29, 7:47 PM PST · 15528 days ago · 5 km deep · 99 km away
3. 2.09 km W of Cobb, CaliforniaThu, Mar 29, 9:23 AM PST · 15529 days ago · 2 km deep · 5 km away
4. 2.26 km WSW of Cobb, CaliforniaThu, Mar 29, 8:02 AM PST · 15529 days ago · 0 km deep · 3 km away
5. 3.05 km WSW of Cobb, CaliforniaThu, Mar 29, 8:02 AM PST · 15529 days ago · 0 km deep · 4 km away
6. 2.05 km WSW of Cobb, CaliforniaThu, Mar 29, 3:47 AM PST · 15529 days ago · 0 km deep · 4 km away
7. 2.17 km W of Cobb, CaliforniaWed, Mar 28, 5:56 PM PST · 15529 days ago · -1 km deep · 3 km away
8. 1.57 km WSW of Calistoga, CaliforniaWed, Mar 28, 11:33 AM PST · 15530 days ago · 0 km deep · 34 km away
9. 1.98 km WSW of Cobb, CaliforniaTue, Mar 27, 11:24 PM PST · 15530 days ago · 3 km deep · 4 km away
10. 1.62 km NE of Ukiah, CaliforniaTue, Mar 27, 11:40 AM PST · 15531 days ago · 8 km deep · 51 km away
11. 2.37 km WSW of Cobb, CaliforniaMon, Mar 26, 11:55 PM PST · 15531 days ago · 1 km deep · 3 km away
12. 1.67 km WSW of Cobb, CaliforniaMon, Mar 26, 11:54 PM PST · 15531 days ago · 1 km deep · 4 km away
13. 1.810 km ESE of Hopland, CaliforniaMon, Mar 26, 1:24 PM PST · 15531 days ago · 10 km deep · 22 km away
14. 1.67 km WSW of Cobb, CaliforniaSun, Mar 25, 11:13 PM PST · 15532 days ago · 1 km deep · 3 km away
15. 1.74 km N of Redwood Valley, CaliforniaSat, Mar 24, 2:46 PM PST · 15533 days ago · 4 km deep · 64 km away
16. 3.24 km N of Redwood Valley, CaliforniaSat, Mar 24, 2:42 PM PST · 15533 days ago · 8 km deep · 64 km away
17. 1.65 km SW of Cobb, CaliforniaSat, Mar 24, 10:51 AM PST · 15534 days ago · 1 km deep · 6 km away
18. 1.76 km WNW of American Canyon, CaliforniaSat, Mar 24, 10:01 AM PST · 15534 days ago · 5 km deep · 81 km away
19. 2.00 km WSW of Green Valley, CaliforniaSat, Mar 24, 8:58 AM PST · 15534 days ago · 9 km deep · 84 km away
20. 1.85 km SW of Cobb, CaliforniaSat, Mar 24, 7:11 AM PST · 15534 days ago · 1 km deep · 6 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc12943. Read Sun, Oct 4, 2026, 8:38 AM UTC.