M1.5 earthquake 5 km SW of Cobb, California

Magnitude

1.5 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Dec 19, 1987, 2:00 AM PST

UTC

1987-12-19 10:00:46 UTC

Depth

1.0 km (0.6 mi), shallow

Epicenter

38.785° N, 122.772° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.6 km horizontally, 1.4 km in depth

Magnitude uncertainty

±0.07

Depth from

From location

Station coverage gap

153°

Stations used

5

• Cobb, CaliforniaPopulation 1,778. Forecast6 kmSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast664 kmNW

After

1. 1.96 km WSW of Cobb, CaliforniaSat, Dec 19, 4:22 AM PST · 14168 days ago · 4 km deep · 3 km away
2. 2.02 km E of Cobb, CaliforniaSat, Dec 19, 10:41 AM PST · 14168 days ago · 3 km deep · 8 km away
3. 1.66 km W of Cobb, CaliforniaTue, Dec 22, 1:58 AM PST · 14165 days ago · 3 km deep · 4 km away
4. 2.6Northern CaliforniaTue, Dec 22, 12:52 PM PST · 14165 days ago · 1 km deep · 7 km away
5. 2.08 km WSW of Cobb, CaliforniaTue, Dec 22, 1:47 PM PST · 14165 days ago · 3 km deep · 4 km away
6. 1.85 km SW of Cobb, CaliforniaWed, Dec 23, 5:21 AM PST · 14164 days ago · -1 km deep · 1 km away
7. 1.55 km SSW of Cobb, CaliforniaThu, Dec 24, 12:15 AM PST · 14164 days ago · 0 km deep · 2 km away
8. 1.85 km WSW of Cobb, CaliforniaThu, Dec 24, 1:41 PM PST · 14163 days ago · 2 km deep · 3 km away
9. 1.67 km ENE of Larkfield-Wikiup, CaliforniaFri, Dec 25, 4:29 AM PST · 14162 days ago · 6 km deep · 30 km away
10. 1.68 km WSW of Cobb, CaliforniaFri, Dec 25, 7:27 AM PST · 14162 days ago · -1 km deep · 4 km away
11. 2.14 km WSW of Cobb, CaliforniaFri, Dec 25, 1:16 PM PST · 14162 days ago · -1 km deep · 2 km away
12. 1.75 km SSW of Cobb, CaliforniaFri, Dec 25, 2:36 PM PST · 14162 days ago · 1 km deep · 3 km away
13. 2.17 km WSW of Cobb, CaliforniaFri, Dec 25, 3:10 PM PST · 14162 days ago · -1 km deep · 2 km away
14. 1.89 km W of Cobb, CaliforniaSat, Dec 26, 7:00 AM PST · 14161 days ago · 0 km deep · 6 km away
15. 1.68 km W of Cobb, CaliforniaSat, Dec 26, 7:00 AM PST · 14161 days ago · 1 km deep · 6 km away
16. 1.75 km WSW of Cobb, CaliforniaSat, Dec 26, 3:30 PM PST · 14161 days ago · 0 km deep · 1 km away
17. 1.94 km W of Cobb, CaliforniaSun, Dec 27, 4:52 PM PST · 14160 days ago · 0 km deep · 5 km away
18. 1.77 km WSW of Cobb, CaliforniaMon, Dec 28, 12:35 AM PST · 14159 days ago · 1 km deep · 3 km away
19. 1.87 km WSW of Cobb, CaliforniaMon, Dec 28, 1:38 AM PST · 14159 days ago · 5 km deep · 2 km away
20. 1.57 km WSW of Cobb, CaliforniaMon, Dec 28, 4:25 AM PST · 14159 days ago · 2 km deep · 3 km away
21. 2.66 km W of Cobb, CaliforniaMon, Dec 28, 1:09 PM PST · 14159 days ago · 3 km deep · 5 km away
22. 2.112 km ESE of Angwin, CaliforniaMon, Dec 28, 1:15 PM PST · 14159 days ago · 3 km deep · 48 km away
23. 1.66 km W of Cobb, CaliforniaMon, Dec 28, 2:51 PM PST · 14159 days ago · 3 km deep · 4 km away
24. 1.87 km WSW of Cobb, CaliforniaMon, Dec 28, 2:54 PM PST · 14159 days ago · 1 km deep · 3 km away
25. 2.4Northern CaliforniaTue, Dec 29, 7:37 AM PST · 14158 days ago · 2 km deep · 5 km away
26. 3.14 km W of Cobb, CaliforniaTue, Dec 29, 12:34 PM PST · 14158 days ago · 0 km deep · 4 km away
27. 1.68 km ENE of Hidden Valley Lake, CaliforniaTue, Dec 29, 9:25 PM PST · 14158 days ago · 8 km deep · 27 km away
28. 2.810 km NW of Cobb, CaliforniaThu, Dec 31, 12:31 AM PST · 14156 days ago · 3 km deep · 11 km away
29. 1.84 km S of Cobb, CaliforniaThu, Dec 31, 3:56 AM PST · 14156 days ago · 2 km deep · 5 km away
30. 1.710 km W of Cobb, CaliforniaFri, Jan 1, 3:48 AM PST · 14155 days ago · -1 km deep · 7 km away
31. 2.110 km WSW of Williams, CaliforniaFri, Jan 1, 6:31 AM PST · 14155 days ago · 2 km deep · 57 km away
32. 1.66 km WSW of Cobb, CaliforniaSat, Jan 2, 7:46 AM PST · 14154 days ago · -1 km deep · 2 km away
33. 1.59 km W of Cobb, CaliforniaSat, Jan 2, 12:30 PM PST · 14154 days ago · 13 km deep · 6 km away
34. 1.79 km W of Cobb, CaliforniaSat, Jan 2, 1:13 PM PST · 14154 days ago · 1 km deep · 7 km away
35. 2.39 km W of Cobb, CaliforniaSat, Jan 2, 10:45 PM PST · 14154 days ago · -1 km deep · 6 km away
36. 1.67 km WSW of Cobb, CaliforniaSun, Jan 3, 2:53 AM PST · 14153 days ago · 1 km deep · 4 km away
37. 1.69 km N of Cloverdale, CaliforniaSun, Jan 3, 8:10 AM PST · 14153 days ago · 1 km deep · 23 km away
38. 1.76 km W of Cobb, CaliforniaSun, Jan 3, 1:14 PM PST · 14153 days ago · 1 km deep · 4 km away
39. 1.87 km W of Cobb, CaliforniaSun, Jan 3, 3:47 PM PST · 14153 days ago · 0 km deep · 5 km away
40. 1.710 km W of Cobb, CaliforniaMon, Jan 4, 1:24 AM PST · 14152 days ago · 3 km deep · 7 km away
41. 1.82 km NE of Santa Rosa, CaliforniaMon, Jan 4, 4:59 AM PST · 14152 days ago · 8 km deep · 37 km away
42. 1.510 km NNE of Cloverdale, CaliforniaMon, Jan 4, 2:42 PM PST · 14152 days ago · 7 km deep · 19 km away
43. 1.96 km SW of Cobb, CaliforniaMon, Jan 4, 6:42 PM PST · 14152 days ago · 2 km deep · 1 km away
44. 1.69 km WSW of Cobb, CaliforniaMon, Jan 4, 8:05 PM PST · 14152 days ago · -1 km deep · 4 km away
45. 1.56 km WSW of Cobb, CaliforniaMon, Jan 4, 10:09 PM PST · 14152 days ago · 13 km deep · 2 km away
46. 1.86 km W of Cobb, CaliforniaTue, Jan 5, 2:30 AM PST · 14151 days ago · 0 km deep · 5 km away
47. 2.07 km W of Cobb, CaliforniaTue, Jan 5, 11:12 AM PST · 14151 days ago · 1 km deep · 6 km away
48. 1.79 km WSW of Cobb, CaliforniaTue, Jan 5, 11:15 AM PST · 14151 days ago · -1 km deep · 5 km away
49. 1.79 km WSW of Cobb, CaliforniaWed, Jan 6, 12:42 AM PST · 14150 days ago · 1 km deep · 5 km away
50. 1.79 km W of Cobb, CaliforniaWed, Jan 6, 8:05 AM PST · 14150 days ago · 1 km deep · 7 km away
51. 2.08 km W of Cobb, CaliforniaWed, Jan 6, 5:14 PM PST · 14150 days ago · 0 km deep · 6 km away
52. 1.811 km SW of Kelseyville, CaliforniaThu, Jan 7, 3:00 AM PST · 14149 days ago · 6 km deep · 17 km away
53. 1.88 km W of Cobb, CaliforniaThu, Jan 7, 4:03 AM PST · 14149 days ago · 1 km deep · 6 km away
54. 1.75 km W of Cobb, CaliforniaThu, Jan 7, 8:58 PM PST · 14149 days ago · 0 km deep · 5 km away
55. 1.54 km WSW of Cobb, CaliforniaThu, Jan 7, 9:12 PM PST · 14149 days ago · 0 km deep · 2 km away
56. 1.86 km WNW of Cobb, CaliforniaFri, Jan 8, 4:13 PM PST · 14148 days ago · 3 km deep · 6 km away
57. 1.96 km W of Cobb, CaliforniaFri, Jan 8, 10:17 PM PST · 14148 days ago · 2 km deep · 4 km away
58. 1.94 km WSW of Cobb, CaliforniaFri, Jan 8, 10:55 PM PST · 14148 days ago · 2 km deep · 2 km away
59. 1.86 km SW of Cobb, CaliforniaFri, Jan 8, 11:33 PM PST · 14148 days ago · 2 km deep · 0 km away
60. 2.67 km WSW of Cobb, CaliforniaSat, Jan 9, 2:43 AM PST · 14147 days ago · 1 km deep · 3 km away

The first 60 of 170.

Before

1. 1.86 km WSW of Cobb, CaliforniaThu, Dec 17, 10:41 PM PST · 14170 days ago · 3 km deep · 3 km away
2. 1.79 km W of Cobb, CaliforniaThu, Dec 17, 9:25 PM PST · 14170 days ago · -1 km deep · 6 km away
3. 1.66 km S of Cobb, CaliforniaThu, Dec 17, 3:15 AM PST · 14170 days ago · -1 km deep · 4 km away
4. 1.85 km WNW of Cobb, CaliforniaThu, Dec 17, 2:58 AM PST · 14170 days ago · 2 km deep · 6 km away
5. 2.27 km W of Cobb, CaliforniaWed, Dec 16, 8:03 PM PST · 14171 days ago · 3 km deep · 5 km away
6. 2.918 km NNE of Upper Lake, CaliforniaWed, Dec 16, 5:02 PM PST · 14171 days ago · 3 km deep · 60 km away
7. 1.77 km WSW of Cobb, CaliforniaTue, Dec 15, 10:28 PM PST · 14172 days ago · -1 km deep · 3 km away
8. 1.64 km ESE of Santa Rosa, CaliforniaTue, Dec 15, 4:22 PM PST · 14172 days ago · 9 km deep · 41 km away
9. 2.14 km S of Cobb, CaliforniaTue, Dec 15, 2:32 PM PST · 14172 days ago · 1 km deep · 5 km away
10. 1.76 km W of Cobb, CaliforniaTue, Dec 15, 4:30 AM PST · 14172 days ago · 3 km deep · 4 km away
11. 1.89 km S of Moskowite Corner, CaliforniaTue, Dec 15, 3:07 AM PST · 14172 days ago · 8 km deep · 69 km away
12. 1.76 km W of Cobb, CaliforniaTue, Dec 15, 12:24 AM PST · 14172 days ago · 2 km deep · 5 km away
13. 1.77 km W of Cobb, CaliforniaMon, Dec 14, 8:38 PM PST · 14173 days ago · 0 km deep · 6 km away
14. 1.86 km W of Cobb, CaliforniaSun, Dec 13, 2:51 PM PST · 14174 days ago · 2 km deep · 4 km away
15. 2.15 km W of Cobb, CaliforniaSun, Dec 13, 2:36 PM PST · 14174 days ago · 3 km deep · 4 km away
16. 1.67 km WSW of Cobb, CaliforniaSun, Dec 13, 2:06 PM PST · 14174 days ago · 4 km deep · 3 km away
17. 1.68 km W of Cobb, CaliforniaSun, Dec 13, 7:05 AM PST · 14174 days ago · 0 km deep · 5 km away
18. 1.75 km WNW of Cobb, CaliforniaSun, Dec 13, 3:44 AM PST · 14174 days ago · 4 km deep · 6 km away
19. 1.75 km SW of Cobb, CaliforniaSun, Dec 13, 3:43 AM PST · 14174 days ago · 1 km deep · 0 km away
20. 1.96 km SW of Cobb, CaliforniaSun, Dec 13, 3:07 AM PST · 14174 days ago · 1 km deep · 0 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1154404. Read Sat, Oct 3, 2026, 7:49 PM UTC.