M1.7 earthquake 7 km WSW of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Sep 28, 1990, 3:16 AM PDT

UTC

1990-09-28 10:16:44 UTC

Depth

1.8 km (1.1 mi), shallow

Epicenter

38.797° N, 122.806° 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

±0.15

Depth from

From location

Station coverage gap

75°

Stations used

17

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmWSW
• Healdsburg, CaliforniaPopulation 11,742. Forecast21 kmNNE
• Santa Rosa, CaliforniaPopulation 178,127. Forecast40 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast667 kmNW

After

1. 1.69 km WNW of Cobb, CaliforniaFri, Sep 28, 10:22 AM PDT · 13155 days ago · 2 km deep · 5 km away
2. 1.710 km NW of Redwood Valley, CaliforniaFri, Sep 28, 6:44 PM PDT · 13155 days ago · 0 km deep · 72 km away
3. 2.84 km S of Cobb, CaliforniaSat, Sep 29, 11:02 AM PDT · 13154 days ago · 1 km deep · 7 km away
4. 2.25 km WSW of Cobb, CaliforniaSat, Sep 29, 1:24 PM PDT · 13154 days ago · 3 km deep · 2 km away
5. 1.7near the coast of Northern CaliforniaSun, Sep 30, 1:42 AM PDT · 13153 days ago · 1 km deep · 35 km away
6. 1.68 km W of Cobb, CaliforniaSun, Sep 30, 4:48 AM PDT · 13153 days ago · 3 km deep · 2 km away
7. 2.27 km S of Cobb, CaliforniaSun, Sep 30, 1:17 PM PDT · 13153 days ago · 1 km deep · 10 km away
8. 2.76 km WNW of Cobb, CaliforniaSun, Sep 30, 11:05 PM PDT · 13152 days ago · -1 km deep · 4 km away
9. 1.69 km W of Cobb, CaliforniaSun, Sep 30, 11:06 PM PDT · 13152 days ago · -1 km deep · 3 km away
10. 1.75 km SSW of Cobb, CaliforniaMon, Oct 1, 1:34 AM PDT · 13152 days ago · 0 km deep · 6 km away
11. 2.022 km NE of Potter Valley, CaliforniaMon, Oct 1, 12:22 PM PDT · 13152 days ago · 6 km deep · 77 km away
12. 1.65 km WSW of Cobb, CaliforniaMon, Oct 1, 5:08 PM PDT · 13152 days ago · 1 km deep · 3 km away
13. 1.510 km W of Cobb, CaliforniaTue, Oct 2, 7:48 AM PDT · 13151 days ago · 0 km deep · 4 km away
14. 1.55 km WNW of Cobb, CaliforniaTue, Oct 2, 11:26 AM PDT · 13151 days ago · 0 km deep · 6 km away
15. 1.94 km WSW of Cobb, CaliforniaTue, Oct 2, 3:55 PM PDT · 13151 days ago · 0 km deep · 3 km away
16. 1.94 km SW of Cobb, CaliforniaThu, Oct 4, 6:47 AM PDT · 13149 days ago · 0 km deep · 4 km away
17. 2.06 km S of Cobb, CaliforniaThu, Oct 4, 1:20 PM PDT · 13149 days ago · 1 km deep · 9 km away
18. 1.66 km W of Cobb, CaliforniaSat, Oct 6, 7:41 AM PDT · 13147 days ago · -1 km deep · 3 km away
19. 2.29 km W of Cobb, CaliforniaSat, Oct 6, 8:51 AM PDT · 13147 days ago · 0 km deep · 4 km away
20. 1.79 km W of Cobb, CaliforniaSat, Oct 6, 8:54 AM PDT · 13147 days ago · 0 km deep · 4 km away
21. 2.25 km WSW of Cobb, CaliforniaSat, Oct 6, 5:57 PM PDT · 13147 days ago · -1 km deep · 2 km away
22. 1.66 km SW of Cobb, CaliforniaSat, Oct 6, 6:51 PM PDT · 13147 days ago · 0 km deep · 4 km away
23. 1.812 km N of Brooktrails, CaliforniaSun, Oct 7, 12:20 PM PDT · 13146 days ago · 10 km deep · 98 km away
24. 2.312 km N of Brooktrails, CaliforniaMon, Oct 8, 2:38 PM PDT · 13145 days ago · 9 km deep · 97 km away
25. 1.85 km W of Cobb, CaliforniaMon, Oct 8, 8:32 PM PDT · 13144 days ago · 0 km deep · 3 km away
26. 1.610 km SE of Hidden Valley Lake, CaliforniaTue, Oct 9, 10:47 AM PDT · 13144 days ago · 5 km deep · 30 km away
27. 1.512 km N of Brooktrails, CaliforniaTue, Oct 9, 3:28 PM PDT · 13144 days ago · 8 km deep · 98 km away
28. 1.97 km W of Cobb, CaliforniaWed, Oct 10, 7:08 AM PDT · 13143 days ago · 3 km deep · 2 km away
29. 3.47 km WSW of Cobb, CaliforniaWed, Oct 10, 10:55 AM PDT · 13143 days ago · 3 km deep · 0 km away
30. 1.58 km W of Cobb, CaliforniaWed, Oct 10, 10:56 AM PDT · 13143 days ago · 1 km deep · 3 km away
31. 1.68 km W of Cobb, CaliforniaWed, Oct 10, 10:57 AM PDT · 13143 days ago · 0 km deep · 4 km away
32. 2.48 km W of Cobb, CaliforniaWed, Oct 10, 10:59 AM PDT · 13143 days ago · -1 km deep · 3 km away
33. 1.87 km WSW of Cobb, CaliforniaWed, Oct 10, 11:03 AM PDT · 13143 days ago · 3 km deep · 1 km away
34. 2.44 km W of Cobb, CaliforniaWed, Oct 10, 11:41 AM PDT · 13143 days ago · 2 km deep · 4 km away
35. 1.94 km W of Cobb, CaliforniaWed, Oct 10, 11:46 AM PDT · 13143 days ago · 2 km deep · 3 km away
36. 1.59 km ESE of Hidden Valley Lake, CaliforniaWed, Oct 10, 11:52 AM PDT · 13143 days ago · 5 km deep · 31 km away
37. 1.84 km ESE of Kenwood, CaliforniaWed, Oct 10, 3:16 PM PDT · 13143 days ago · 1 km deep · 51 km away
38. 1.76 km ENE of Cloverdale, CaliforniaThu, Oct 11, 7:14 AM PDT · 13142 days ago · 2 km deep · 14 km away
39. 2.410 km W of Cobb, CaliforniaThu, Oct 11, 12:24 PM PDT · 13142 days ago · 0 km deep · 4 km away
40. 1.710 km W of Cobb, CaliforniaThu, Oct 11, 12:26 PM PDT · 13142 days ago · 0 km deep · 4 km away
41. 2.23 km W of Cobb, CaliforniaThu, Oct 11, 1:28 PM PDT · 13142 days ago · 0 km deep · 4 km away
42. 1.93 km NNE of Cloverdale, CaliforniaThu, Oct 11, 11:59 PM PDT · 13141 days ago · 3 km deep · 18 km away
43. 1.77 km W of Cobb, CaliforniaFri, Oct 12, 4:51 AM PDT · 13141 days ago · 3 km deep · 2 km away
44. 3.50 km SW of Crockett, CaliforniaSat, Oct 13, 7:06 PM PDT · 13139 days ago · 12 km deep · 98 km away
45. 2.31 km W of Crockett, CaliforniaSun, Oct 14, 12:07 AM PDT · 13139 days ago · 10 km deep · 97 km away
46. 2.1Northern CaliforniaSun, Oct 14, 3:11 AM PDT · 13139 days ago · 1 km deep · 9 km away
47. 1.86 km ENE of Santa Rosa, CaliforniaSun, Oct 14, 6:29 AM PDT · 13139 days ago · 1 km deep · 41 km away
48. 1.75 km WSW of Cobb, CaliforniaMon, Oct 15, 12:37 AM PDT · 13138 days ago · 0 km deep · 3 km away
49. 1.9Northern CaliforniaMon, Oct 15, 8:49 AM PDT · 13138 days ago · 2 km deep · 41 km away
50. 2.25 km ENE of Santa Rosa, CaliforniaMon, Oct 15, 8:49 AM PDT · 13138 days ago · 1 km deep · 41 km away
51. 1.88 km W of Cobb, CaliforniaMon, Oct 15, 2:36 PM PDT · 13138 days ago · 2 km deep · 3 km away
52. 2.16 km ENE of Santa Rosa, CaliforniaMon, Oct 15, 4:03 PM PDT · 13138 days ago · 1 km deep · 41 km away
53. 1.610 km W of Cobb, CaliforniaTue, Oct 16, 11:41 AM PDT · 13137 days ago · 0 km deep · 4 km away
54. 1.68 km ENE of Brooktrails, CaliforniaTue, Oct 16, 12:41 PM PDT · 13137 days ago · 4 km deep · 87 km away
55. 2.56 km S of Cobb, CaliforniaWed, Oct 17, 6:20 AM PDT · 13136 days ago · 0 km deep · 7 km away
56. 1.74 km WSW of Cobb, CaliforniaWed, Oct 17, 8:24 PM PDT · 13135 days ago · 1 km deep · 3 km away
57. 2.87 km WSW of Cobb, CaliforniaThu, Oct 18, 1:34 AM PDT · 13135 days ago · 0 km deep · 1 km away
58. 1.67 km WSW of Cobb, CaliforniaThu, Oct 18, 1:34 AM PDT · 13135 days ago · 0 km deep · 1 km away
59. 2.25 km W of Cobb, CaliforniaFri, Oct 19, 1:18 PM PDT · 13134 days ago · 2 km deep · 3 km away
60. 1.98 km W of Cobb, CaliforniaSat, Oct 20, 12:34 AM PDT · 13133 days ago · 1 km deep · 3 km away

The first 60 of 170.

Before

1. 2.37 km SW of Cobb, CaliforniaThu, Sep 27, 1:06 AM PDT · 13156 days ago · 0 km deep · 4 km away
2. 1.93 km SSE of Calpella, CaliforniaWed, Sep 26, 9:04 PM PDT · 13156 days ago · 0 km deep · 56 km away
3. 2.26 km W of Cobb, CaliforniaWed, Sep 26, 5:06 PM PDT · 13157 days ago · 3 km deep · 3 km away
4. 1.75 km WSW of Cobb, CaliforniaWed, Sep 26, 2:25 PM PDT · 13157 days ago · 0 km deep · 3 km away
5. 2.39 km W of Cobb, CaliforniaTue, Sep 25, 4:56 PM PDT · 13158 days ago · 0 km deep · 4 km away
6. 2.510 km W of Cobb, CaliforniaTue, Sep 25, 4:53 PM PDT · 13158 days ago · 0 km deep · 4 km away
7. 1.87 km WSW of Cobb, CaliforniaTue, Sep 25, 2:18 AM PDT · 13158 days ago · 3 km deep · 1 km away
8. 1.810 km W of Cobb, CaliforniaMon, Sep 24, 11:32 PM PDT · 13158 days ago · 0 km deep · 4 km away
9. 1.63 km W of Cobb, CaliforniaSat, Sep 22, 7:41 PM PDT · 13160 days ago · 1 km deep · 4 km away
10. 1.99 km W of Cobb, CaliforniaSat, Sep 22, 6:17 PM PDT · 13161 days ago · 0 km deep · 4 km away
11. 1.57 km NW of Brooktrails, CaliforniaSat, Sep 22, 1:59 AM PDT · 13161 days ago · 5 km deep · 95 km away
12. 2.47 km W of Cobb, CaliforniaFri, Sep 21, 2:09 PM PDT · 13162 days ago · 0 km deep · 2 km away
13. 2.97 km WSW of Cobb, CaliforniaFri, Sep 21, 10:34 AM PDT · 13162 days ago · 1 km deep · 1 km away
14. 1.87 km WSW of Cobb, CaliforniaFri, Sep 21, 10:33 AM PDT · 13162 days ago · 1 km deep · 1 km away
15. 1.67 km WSW of Cobb, CaliforniaFri, Sep 21, 9:53 AM PDT · 13162 days ago · 0 km deep · 0 km away
16. 1.97 km WSW of Cobb, CaliforniaFri, Sep 21, 9:53 AM PDT · 13162 days ago · 1 km deep · 0 km away
17. 3.37 km WSW of Cobb, CaliforniaFri, Sep 21, 9:52 AM PDT · 13162 days ago · 0 km deep · 0 km away
18. 1.88 km W of Cobb, CaliforniaThu, Sep 20, 6:47 PM PDT · 13163 days ago · -1 km deep · 3 km away
19. 1.710 km NW of Cobb, CaliforniaThu, Sep 20, 6:13 AM PDT · 13163 days ago · 0 km deep · 9 km away
20. 1.85 km W of Cobb, CaliforniaWed, Sep 19, 6:41 PM PDT · 13164 days ago · 1 km deep · 3 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc164624. Read Sun, Oct 4, 2026, 1:34 PM UTC.