M1.5 earthquake 5 km WSW of Cobb, California

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sun, Dec 23, 1984, 2:58 AM PST

UTC

1984-12-23 10:58:14 UTC

Depth

0.2 km (0.1 mi), shallow

Epicenter

38.798° N, 122.781° 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

±0.23

Depth from

From location

Station coverage gap

55°

Stations used

11

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast40 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast666 kmNW

After

1. 2.26 km W of Cobb, CaliforniaSun, Dec 23, 4:10 AM PST · 15259 days ago · 3 km deep · 3 km away
2. 2.56 km W of Cobb, CaliforniaSun, Dec 23, 6:17 AM PST · 15259 days ago · 4 km deep · 2 km away
3. 1.56 km W of Cobb, CaliforniaMon, Dec 24, 12:16 AM PST · 15258 days ago · 3 km deep · 3 km away
4. 1.87 km W of Cobb, CaliforniaMon, Dec 24, 3:08 AM PST · 15258 days ago · 3 km deep · 3 km away
5. 1.68 km W of Cobb, CaliforniaMon, Dec 24, 8:28 AM PST · 15258 days ago · 0 km deep · 4 km away
6. 1.67 km W of Cobb, CaliforniaMon, Dec 24, 10:17 AM PST · 15258 days ago · 1 km deep · 4 km away
7. 1.53 km SW of Cobb, CaliforniaMon, Dec 24, 10:31 AM PST · 15258 days ago · 12 km deep · 3 km away
8. 1.56 km ESE of Hopland, CaliforniaTue, Dec 25, 3:18 AM PST · 15257 days ago · 5 km deep · 29 km away
9. 1.95 km W of Cobb, CaliforniaTue, Dec 25, 4:18 AM PST · 15257 days ago · 0 km deep · 3 km away
10. 1.87 km WSW of Cobb, CaliforniaTue, Dec 25, 11:50 AM PST · 15257 days ago · 0 km deep · 3 km away
11. 1.93 km NE of Point Arena, CaliforniaTue, Dec 25, 8:44 PM PST · 15256 days ago · -1 km deep · 78 km away
12. 2.05 km WNW of Cobb, CaliforniaWed, Dec 26, 10:33 PM PST · 15255 days ago · 1 km deep · 4 km away
13. 1.86 km W of Cobb, CaliforniaWed, Dec 26, 10:33 PM PST · 15255 days ago · 3 km deep · 4 km away
14. 1.54 km WSW of Cobb, CaliforniaWed, Dec 26, 10:39 PM PST · 15255 days ago · 1 km deep · 1 km away
15. 1.96 km WSW of Cobb, CaliforniaThu, Dec 27, 11:16 AM PST · 15255 days ago · 3 km deep · 1 km away
16. 1.87 km W of Cobb, CaliforniaThu, Dec 27, 2:57 PM PST · 15255 days ago · 3 km deep · 3 km away
17. 2.73 km NNE of Santa Rosa, CaliforniaFri, Dec 28, 3:09 AM PST · 15254 days ago · 8 km deep · 37 km away
18. 1.81 km SSW of Kenwood, CaliforniaFri, Dec 28, 6:06 AM PST · 15254 days ago · 4 km deep · 49 km away
19. 1.68 km WSW of Cobb, CaliforniaFri, Dec 28, 9:48 AM PST · 15254 days ago · 3 km deep · 2 km away
20. 1.74 km W of Cobb, CaliforniaSat, Dec 29, 6:51 AM PST · 15253 days ago · -1 km deep · 2 km away
21. 3.06 km W of Cobb, CaliforniaSat, Dec 29, 8:21 AM PST · 15253 days ago · 3 km deep · 3 km away
22. 2.77 km WSW of Cobb, CaliforniaSat, Dec 29, 3:50 PM PST · 15253 days ago · 1 km deep · 2 km away
23. 1.94 km WSW of Cobb, CaliforniaSat, Dec 29, 4:10 PM PST · 15253 days ago · 1 km deep · 1 km away
24. 1.89 km NNW of Redwood Valley, CaliforniaSat, Dec 29, 7:53 PM PST · 15252 days ago · 7 km deep · 73 km away
25. 1.66 km W of Cobb, CaliforniaSun, Dec 30, 4:38 AM PST · 15252 days ago · 2 km deep · 2 km away
26. 1.916 km ENE of Potter Valley, CaliforniaSun, Dec 30, 9:29 AM PST · 15252 days ago · 6 km deep · 67 km away
27. 1.87 km W of Cobb, CaliforniaSun, Dec 30, 6:11 PM PST · 15252 days ago · 0 km deep · 3 km away
28. 2.07 km W of Cobb, CaliforniaSun, Dec 30, 8:13 PM PST · 15251 days ago · 1 km deep · 3 km away
29. 1.610 km WNW of Potter Valley, CaliforniaMon, Dec 31, 1:28 AM PST · 15251 days ago · 7 km deep · 74 km away
30. 1.67 km WSW of Cobb, CaliforniaMon, Dec 31, 3:38 PM PST · 15251 days ago · 0 km deep · 2 km away
31. 1.66 km W of Cobb, CaliforniaMon, Dec 31, 6:49 PM PST · 15251 days ago · 1 km deep · 4 km away
32. 1.66 km WSW of Cobb, CaliforniaMon, Dec 31, 7:03 PM PST · 15251 days ago · 0 km deep · 2 km away
33. 1.67 km WSW of Cobb, CaliforniaTue, Jan 1, 11:21 PM PST · 15249 days ago · 3 km deep · 3 km away
34. 2.48 km WSW of Cobb, CaliforniaWed, Jan 2, 5:12 AM PST · 15249 days ago · -1 km deep · 3 km away
35. 2.45 km W of Cobb, CaliforniaWed, Jan 2, 3:12 PM PST · 15249 days ago · 0 km deep · 3 km away
36. 1.75 km W of Cobb, CaliforniaWed, Jan 2, 3:12 PM PST · 15249 days ago · 0 km deep · 3 km away
37. 1.75 km SW of Cobb, CaliforniaWed, Jan 2, 5:53 PM PST · 15249 days ago · 1 km deep · 1 km away
38. 1.96 km W of Cobb, CaliforniaThu, Jan 3, 5:17 AM PST · 15248 days ago · 3 km deep · 3 km away
39. 1.89 km W of Cobb, CaliforniaThu, Jan 3, 7:39 AM PST · 15248 days ago · 0 km deep · 4 km away
40. 1.87 km WSW of Cobb, CaliforniaThu, Jan 3, 10:36 PM PST · 15247 days ago · 2 km deep · 2 km away
41. 2.28 km W of Cobb, CaliforniaFri, Jan 4, 4:05 AM PST · 15247 days ago · 0 km deep · 5 km away
42. 2.54 km ENE of Geyserville, CaliforniaFri, Jan 4, 1:07 PM PST · 15247 days ago · 14 km deep · 10 km away
43. 2.220 km NNE of Upper Lake, CaliforniaFri, Jan 4, 4:49 PM PST · 15247 days ago · 7 km deep · 61 km away
44. 1.65 km NNW of Hidden Valley Lake, CaliforniaSat, Jan 5, 9:58 AM PST · 15246 days ago · 7 km deep · 18 km away
45. 1.619 km ENE of Potter Valley, CaliforniaSat, Jan 5, 8:36 PM PST · 15245 days ago · 10 km deep · 66 km away
46. 2.35 km SW of Cobb, CaliforniaSun, Jan 6, 10:16 AM PST · 15245 days ago · 1 km deep · 1 km away
47. 1.64 km WSW of Cobb, CaliforniaSun, Jan 6, 3:39 PM PST · 15245 days ago · 1 km deep · 1 km away
48. 1.96 km W of Cobb, CaliforniaSun, Jan 6, 6:17 PM PST · 15245 days ago · 1 km deep · 3 km away
49. 2.48 km WSW of Cobb, CaliforniaMon, Jan 7, 4:30 AM PST · 15244 days ago · 3 km deep · 3 km away
50. 1.53 km WNW of Cobb, CaliforniaMon, Jan 7, 2:08 PM PST · 15244 days ago · 2 km deep · 4 km away
51. 1.76 km W of Cobb, CaliforniaMon, Jan 7, 3:21 PM PST · 15244 days ago · 4 km deep · 3 km away
52. 1.56 km WSW of Cobb, CaliforniaTue, Jan 8, 1:41 AM PST · 15243 days ago · 0 km deep · 1 km away
53. 1.97 km W of Cobb, CaliforniaTue, Jan 8, 2:38 AM PST · 15243 days ago · 0 km deep · 4 km away
54. 1.916 km ENE of Potter Valley, CaliforniaTue, Jan 8, 2:07 PM PST · 15243 days ago · 7 km deep · 68 km away
55. 1.5Northern CaliforniaTue, Jan 8, 2:30 PM PST · 15243 days ago · 1 km deep · 7 km away
56. 1.88 km W of Cobb, CaliforniaTue, Jan 8, 6:58 PM PST · 15243 days ago · 0 km deep · 5 km away
57. 1.75 km W of Cobb, CaliforniaWed, Jan 9, 10:52 AM PST · 15242 days ago · 1 km deep · 3 km away
58. 1.77 km WSW of Cobb, CaliforniaWed, Jan 9, 1:19 PM PST · 15242 days ago · 3 km deep · 2 km away
59. 1.58 km W of Cobb, CaliforniaWed, Jan 9, 1:19 PM PST · 15242 days ago · 1 km deep · 5 km away
60. 1.6Northern CaliforniaWed, Jan 9, 7:40 PM PST · 15241 days ago · 0 km deep · 0 km away

The first 60 of 196.

Before

1. 1.53 km WSW of Calistoga, CaliforniaSun, Dec 23, 1:58 AM PST · 15259 days ago · 4 km deep · 30 km away
2. 1.67 km WSW of Cobb, CaliforniaSat, Dec 22, 10:41 PM PST · 15259 days ago · 1 km deep · 2 km away
3. 2.111 km NE of Talmage, CaliforniaSat, Dec 22, 12:57 PM PST · 15260 days ago · 7 km deep · 51 km away
4. 1.56 km SW of Cobb, CaliforniaSat, Dec 22, 8:38 AM PST · 15260 days ago · 0 km deep · 2 km away
5. 1.8Northern CaliforniaSat, Dec 22, 7:47 AM PST · 15260 days ago · 1 km deep · 2 km away
6. 2.7Northern CaliforniaSat, Dec 22, 7:38 AM PST · 15260 days ago · 0 km deep · 1 km away
7. 1.85 km SW of Cobb, CaliforniaSat, Dec 22, 7:37 AM PST · 15260 days ago · 0 km deep · 1 km away
8. 1.55 km SW of Cobb, CaliforniaSat, Dec 22, 7:34 AM PST · 15260 days ago · 1 km deep · 2 km away
9. 3.05 km SW of Cobb, CaliforniaSat, Dec 22, 7:34 AM PST · 15260 days ago · 0 km deep · 2 km away
10. 3.45 km SW of Cobb, CaliforniaSat, Dec 22, 7:33 AM PST · 15260 days ago · 0 km deep · 1 km away
11. 1.98 km W of Cobb, CaliforniaSat, Dec 22, 1:00 AM PST · 15260 days ago · 1 km deep · 5 km away
12. 1.65 km W of Cobb, CaliforniaFri, Dec 21, 11:43 PM PST · 15260 days ago · 1 km deep · 2 km away
13. 1.817 km ENE of Potter Valley, CaliforniaFri, Dec 21, 4:17 PM PST · 15261 days ago · 7 km deep · 68 km away
14. 1.67 km W of Cobb, CaliforniaFri, Dec 21, 12:25 PM PST · 15261 days ago · 1 km deep · 4 km away
15. 2.55 km WSW of Cobb, CaliforniaFri, Dec 21, 3:28 AM PST · 15261 days ago · 1 km deep · 1 km away
16. 1.74 km W of Glen Ellen, CaliforniaFri, Dec 21, 12:05 AM PST · 15261 days ago · 9 km deep · 51 km away
17. 2.05 km N of Sea Ranch, CaliforniaThu, Dec 20, 2:19 PM PST · 15262 days ago · 22 km deep · 58 km away
18. 1.616 km WSW of Cloverdale, CaliforniaThu, Dec 20, 10:29 AM PST · 15262 days ago · 9 km deep · 36 km away
19. 2.17 km W of Cobb, CaliforniaWed, Dec 19, 6:46 PM PST · 15263 days ago · 0 km deep · 4 km away
20. 1.58 km W of Cobb, CaliforniaWed, Dec 19, 6:15 PM PST · 15263 days ago · 1 km deep · 4 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc35455. Read Sat, Oct 3, 2026, 2:43 PM UTC.