M1.8 earthquake 14 km E of Angwin, California

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Sep 28, 1989, 5:17 PM PDT

UTC

1989-09-29 00:17:20 UTC

Depth

1.1 km (0.7 mi), shallow

Epicenter

38.556° N, 122.286° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.9 km horizontally, 1.1 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

58°

Stations used

19

• Angwin, CaliforniaPopulation 3,051. Forecast14 kmE
• Napa, CaliforniaPopulation 80,434. Forecast29 kmN
• Santa Rosa, CaliforniaPopulation 178,127. Forecast39 kmENE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast618 kmNW

After

1. 1.65 km W of Cobb, CaliforniaFri, Sep 29, 10:37 AM PDT · 13520 days ago · 2 km deep · 53 km away
2. 1.57 km W of Cobb, CaliforniaFri, Sep 29, 2:40 PM PDT · 13519 days ago · 0 km deep · 54 km away
3. 1.74 km W of Cobb, CaliforniaFri, Sep 29, 10:18 PM PDT · 13519 days ago · 2 km deep · 52 km away
4. 1.711 km W of Cobb, CaliforniaSat, Sep 30, 2:22 AM PDT · 13519 days ago · 3 km deep · 57 km away
5. 2.56 km W of Cobb, CaliforniaSat, Sep 30, 6:55 AM PDT · 13519 days ago · 3 km deep · 54 km away
6. 1.910 km WSW of Cobb, CaliforniaSat, Sep 30, 7:59 AM PDT · 13519 days ago · 2 km deep · 55 km away
7. 1.69 km WNW of Cobb, CaliforniaSat, Sep 30, 3:11 PM PDT · 13518 days ago · 1 km deep · 57 km away
8. 1.84 km WNW of Cobb, CaliforniaSat, Sep 30, 5:41 PM PDT · 13518 days ago · 2 km deep · 53 km away
9. 1.62 km SW of Cottonwood, CaliforniaSat, Sep 30, 8:50 PM PDT · 13518 days ago · 9 km deep · 27 km away
10. 2.45 km WNW of Cobb, CaliforniaSat, Sep 30, 10:32 PM PDT · 13518 days ago · 0 km deep · 53 km away
11. 1.95 km W of Cobb, CaliforniaSat, Sep 30, 10:34 PM PDT · 13518 days ago · 1 km deep · 53 km away
12. 2.012 km N of Pittsburg, CaliforniaSun, Oct 1, 3:48 AM PDT · 13518 days ago · 2 km deep · 58 km away
13. 2.012 km NNW of Pittsburg, CaliforniaSun, Oct 1, 4:37 AM PDT · 13518 days ago · 3 km deep · 57 km away
14. 2.714 km N of Pittsburg, CaliforniaSun, Oct 1, 5:21 AM PDT · 13518 days ago · 16 km deep · 56 km away
15. 2.211 km N of Bay Point, CaliforniaSun, Oct 1, 5:22 AM PDT · 13518 days ago · 14 km deep · 56 km away
16. 2.112 km N of Pittsburg, CaliforniaSun, Oct 1, 5:50 AM PDT · 13518 days ago · 14 km deep · 57 km away
17. 2.413 km N of Pittsburg, CaliforniaSun, Oct 1, 6:04 AM PDT · 13518 days ago · 18 km deep · 56 km away
18. 3.012 km NNE of Bay Point, CaliforniaSun, Oct 1, 6:10 AM PDT · 13518 days ago · 17 km deep · 56 km away
19. 1.812 km N of Pittsburg, CaliforniaSun, Oct 1, 6:19 AM PDT · 13518 days ago · 5 km deep · 57 km away
20. 3.213 km SE of Suisun, CaliforniaSun, Oct 1, 6:19 AM PDT · 13518 days ago · 15 km deep · 54 km away
21. 1.912 km N of Bay Point, CaliforniaSun, Oct 1, 6:21 AM PDT · 13518 days ago · 6 km deep · 56 km away
22. 1.811 km N of Bay Point, CaliforniaSun, Oct 1, 6:38 AM PDT · 13518 days ago · 1 km deep · 55 km away
23. 2.113 km NNW of Pittsburg, CaliforniaSun, Oct 1, 7:17 AM PDT · 13518 days ago · 22 km deep · 56 km away
24. 1.913 km N of Pittsburg, CaliforniaSun, Oct 1, 8:23 AM PDT · 13518 days ago · 3 km deep · 57 km away
25. 2.013 km NNE of Bay Point, CaliforniaSun, Oct 1, 2:13 PM PDT · 13517 days ago · 21 km deep · 55 km away
26. 2.513 km N of Bay Point, CaliforniaSun, Oct 1, 2:41 PM PDT · 13517 days ago · 18 km deep · 55 km away
27. 1.88 km W of Cobb, CaliforniaSun, Oct 1, 9:30 PM PDT · 13517 days ago · 1 km deep · 56 km away
28. 1.612 km NNE of Bay Point, CaliforniaMon, Oct 2, 1:13 AM PDT · 13517 days ago · 2 km deep · 56 km away
29. 2.713 km N of Pittsburg, CaliforniaMon, Oct 2, 4:20 AM PDT · 13517 days ago · 21 km deep · 56 km away
30. 2.58 km W of Cobb, CaliforniaMon, Oct 2, 11:23 AM PDT · 13517 days ago · 0 km deep · 56 km away
31. 1.57 km WSW of Cobb, CaliforniaMon, Oct 2, 2:29 PM PDT · 13516 days ago · 4 km deep · 53 km away
32. 1.913 km E of Clearlake, CaliforniaTue, Oct 3, 3:27 AM PDT · 13516 days ago · 1 km deep · 49 km away
33. 1.57 km W of Cobb, CaliforniaTue, Oct 3, 4:18 AM PDT · 13516 days ago · 0 km deep · 55 km away
34. 1.87 km WNW of Cobb, CaliforniaTue, Oct 3, 4:19 AM PDT · 13516 days ago · 0 km deep · 55 km away
35. 2.29 km W of Cobb, CaliforniaTue, Oct 3, 9:43 AM PDT · 13516 days ago · 2 km deep · 57 km away
36. 2.04 km W of Cobb, CaliforniaWed, Oct 4, 4:27 PM PDT · 13514 days ago · 2 km deep · 52 km away
37. 1.74 km SE of Piedmont, CaliforniaWed, Oct 4, 11:19 PM PDT · 13514 days ago · 10 km deep · 84 km away
38. 1.86 km W of Cobb, CaliforniaThu, Oct 5, 11:47 PM PDT · 13513 days ago · 4 km deep · 54 km away
39. 1.67 km WNW of Cobb, CaliforniaSat, Oct 7, 1:21 PM PDT · 13511 days ago · 0 km deep · 55 km away
40. 1.65 km WNW of Broadmoor, CaliforniaSun, Oct 8, 5:00 AM PDT · 13511 days ago · 8 km deep · 98 km away
41. 1.66 km WSW of Cobb, CaliforniaSun, Oct 8, 9:38 AM PDT · 13511 days ago · 1 km deep · 51 km away
42. 1.9Northern CaliforniaSun, Oct 8, 9:49 AM PDT · 13511 days ago · 2 km deep · 42 km away
43. 3.26 km W of Cobb, CaliforniaTue, Oct 10, 10:53 PM PDT · 13508 days ago · 1 km deep · 54 km away
44. 2.87 km W of Cobb, CaliforniaTue, Oct 10, 10:53 PM PDT · 13508 days ago · -1 km deep · 54 km away
45. 2.06 km W of Cobb, CaliforniaTue, Oct 10, 10:54 PM PDT · 13508 days ago · 2 km deep · 54 km away
46. 2.04 km WSW of Cobb, CaliforniaWed, Oct 11, 1:09 AM PDT · 13508 days ago · 2 km deep · 50 km away
47. 2.55 km W of Cobb, CaliforniaWed, Oct 11, 2:47 AM PDT · 13508 days ago · -1 km deep · 53 km away
48. 2.36 km W of Cobb, CaliforniaThu, Oct 12, 8:45 AM PDT · 13507 days ago · 4 km deep · 53 km away
49. 1.58 km E of Hidden Valley Lake, CaliforniaThu, Oct 12, 6:22 PM PDT · 13506 days ago · 8 km deep · 32 km away
50. 1.612 km ENE of Angwin, CaliforniaThu, Oct 12, 11:06 PM PDT · 13506 days ago · 3 km deep · 8 km away
51. 1.66 km WNW of Cobb, CaliforniaFri, Oct 13, 2:43 AM PDT · 13506 days ago · 3 km deep · 54 km away
52. 1.86 km W of Cobb, CaliforniaFri, Oct 13, 3:50 PM PDT · 13505 days ago · 1 km deep · 53 km away
53. 1.95 km WSW of Cobb, CaliforniaFri, Oct 13, 10:22 PM PDT · 13505 days ago · 0 km deep · 52 km away
54. 1.67 km W of Cobb, CaliforniaSat, Oct 14, 1:37 AM PDT · 13505 days ago · 0 km deep · 55 km away
55. 1.65 km WSW of Cobb, CaliforniaSun, Oct 15, 2:02 AM PDT · 13504 days ago · 0 km deep · 52 km away
56. 2.08 km WSW of Cobb, CaliforniaMon, Oct 16, 9:25 AM PDT · 13503 days ago · 3 km deep · 54 km away
57. 1.84 km WSW of Cobb, CaliforniaMon, Oct 16, 6:28 PM PDT · 13502 days ago · 2 km deep · 50 km away
58. 2.48 km WNW of Beale Air Force Base, CaliforniaTue, Oct 17, 8:56 AM PDT · 13502 days ago · 14 km deep · 96 km away
59. 2.3Northern CaliforniaTue, Oct 17, 8:57 AM PDT · 13502 days ago · 14 km deep · 97 km away
60. 1.97 km WSW of Cobb, CaliforniaTue, Oct 17, 4:09 PM PDT · 13501 days ago · 1 km deep · 53 km away

The first 60 of 156.

Before

1. 2.05 km NE of Strawberry, CaliforniaThu, Sep 28, 1:46 PM PDT · 13520 days ago · 9 km deep · 71 km away
2. 1.93 km W of Cobb, CaliforniaThu, Sep 28, 8:58 AM PDT · 13521 days ago · 0 km deep · 51 km away
3. 1.914 km NW of Moskowite Corner, CaliforniaTue, Sep 26, 11:32 PM PDT · 13522 days ago · 2 km deep · 1 km away
4. 1.78 km ENE of Clearlake, CaliforniaTue, Sep 26, 11:00 PM PDT · 13522 days ago · 5 km deep · 52 km away
5. 2.44 km N of Geyserville, CaliforniaTue, Sep 26, 9:27 PM PDT · 13522 days ago · 4 km deep · 57 km away
6. 2.45 km N of Geyserville, CaliforniaTue, Sep 26, 9:26 PM PDT · 13522 days ago · 4 km deep · 58 km away
7. 2.4Northern CaliforniaTue, Sep 26, 8:59 PM PDT · 13522 days ago · 4 km deep · 58 km away
8. 1.613 km NW of Moskowite Corner, CaliforniaTue, Sep 26, 9:38 AM PDT · 13523 days ago · 2 km deep · 2 km away
9. 2.55 km N of Geyserville, CaliforniaTue, Sep 26, 6:13 AM PDT · 13523 days ago · 4 km deep · 57 km away
10. 1.96 km N of Geyserville, CaliforniaTue, Sep 26, 5:06 AM PDT · 13523 days ago · 4 km deep · 58 km away
11. 2.06 km WNW of Cobb, CaliforniaTue, Sep 26, 1:44 AM PDT · 13523 days ago · 1 km deep · 54 km away
12. 2.05 km N of Geyserville, CaliforniaTue, Sep 26, 12:22 AM PDT · 13523 days ago · 5 km deep · 58 km away
13. 2.76 km N of Geyserville, CaliforniaMon, Sep 25, 9:18 PM PDT · 13523 days ago · 2 km deep · 59 km away
14. 2.16 km N of Geyserville, CaliforniaMon, Sep 25, 8:24 PM PDT · 13523 days ago · 5 km deep · 58 km away
15. 3.35 km N of Geyserville, CaliforniaMon, Sep 25, 7:13 PM PDT · 13523 days ago · 5 km deep · 57 km away
16. 1.95 km N of Geyserville, CaliforniaMon, Sep 25, 7:07 PM PDT · 13523 days ago · 5 km deep · 57 km away
17. 1.67 km SE of Sea Ranch, CaliforniaMon, Sep 25, 6:48 PM PDT · 13523 days ago · 3 km deep · 97 km away
18. 1.85 km ENE of Clayton, CaliforniaMon, Sep 25, 7:40 AM PDT · 13524 days ago · 14 km deep · 74 km away
19. 2.25 km N of Geyserville, CaliforniaSat, Sep 23, 8:23 PM PDT · 13525 days ago · 3 km deep · 59 km away
20. 1.99 km W of Cobb, CaliforniaSat, Sep 23, 3:32 AM PDT · 13526 days ago · 1 km deep · 56 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc144742. Read Mon, Oct 5, 2026, 6:58 AM UTC.