M1.7 earthquake 8 km W of Cobb, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Jun 24, 1977, 9:16 AM PDT

UTC

1977-06-24 16:16:12 UTC

Depth

1.6 km (1.0 mi), shallow

Epicenter

38.809° N, 122.822° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

65°

Stations used

14

• Cobb, CaliforniaPopulation 1,778. Forecast9 kmW
• Healdsburg, CaliforniaPopulation 11,742. Forecast22 kmN
• Santa Rosa, CaliforniaPopulation 178,127. Forecast42 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast669 kmNW

After

1. 1.68 km SW of Hopland, CaliforniaSun, Jun 26, 8:13 PM PDT · 17997 days ago · 2 km deep · 33 km away
2. 2.03 km WSW of Calpella, CaliforniaWed, Jun 29, 7:31 AM PDT · 17995 days ago · 10 km deep · 59 km away
3. 2.58 km W of Cobb, CaliforniaWed, Jun 29, 6:09 PM PDT · 17995 days ago · 0 km deep · 0 km away
4. 2.29 km NW of Moskowite Corner, CaliforniaThu, Jun 30, 12:52 AM PDT · 17994 days ago · 14 km deep · 59 km away
5. 1.613 km ENE of Hidden Valley Lake, CaliforniaThu, Jun 30, 11:17 AM PDT · 17994 days ago · 16 km deep · 36 km away
6. 1.68 km W of Cobb, CaliforniaThu, Jun 30, 12:52 PM PDT · 17994 days ago · 3 km deep · 2 km away
7. 2.06 km W of Cobb, CaliforniaThu, Jun 30, 11:04 PM PDT · 17993 days ago · 1 km deep · 2 km away
8. 2.74 km N of Brooktrails, CaliforniaFri, Jul 1, 12:56 AM PDT · 17993 days ago · 11 km deep · 89 km away
9. 2.28 km W of Cobb, CaliforniaFri, Jul 1, 6:09 AM PDT · 17993 days ago · 0 km deep · 0 km away
10. 1.66 km W of Cobb, CaliforniaFri, Jul 1, 10:54 PM PDT · 17992 days ago · 3 km deep · 2 km away
11. 2.510 km W of Cobb, CaliforniaSun, Jul 3, 7:26 PM PDT · 17990 days ago · 0 km deep · 3 km away
12. 2.5Northern CaliforniaSun, Jul 3, 9:09 PM PDT · 17990 days ago · 10 km deep · 81 km away
13. 2.13 km NNW of Larkfield-Wikiup, CaliforniaMon, Jul 4, 12:50 AM PDT · 17990 days ago · 4 km deep · 30 km away
14. 1.710 km W of Cobb, CaliforniaMon, Jul 4, 5:24 AM PDT · 17990 days ago · 1 km deep · 3 km away
15. 2.512 km NE of Healdsburg, CaliforniaWed, Jul 6, 12:54 PM PDT · 17988 days ago · 3 km deep · 15 km away
16. 1.97 km ENE of Hidden Valley Lake, CaliforniaThu, Jul 7, 10:55 AM PDT · 17987 days ago · 6 km deep · 30 km away
17. 2.39 km NE of Hidden Valley Lake, CaliforniaThu, Jul 7, 1:19 PM PDT · 17987 days ago · 6 km deep · 31 km away
18. 1.66 km WSW of Cobb, CaliforniaSat, Jul 9, 12:03 AM PDT · 17985 days ago · 3 km deep · 2 km away
19. 2.86 km WSW of Cobb, CaliforniaSun, Jul 10, 12:15 AM PDT · 17984 days ago · 4 km deep · 2 km away
20. 2.07 km WSW of Cobb, CaliforniaTue, Jul 12, 4:08 AM PDT · 17982 days ago · 0 km deep · 1 km away
21. 2.17 km W of Cobb, CaliforniaTue, Jul 12, 11:28 PM PDT · 17981 days ago · 3 km deep · 2 km away
22. 1.97 km WSW of Cobb, CaliforniaThu, Jul 14, 4:56 PM PDT · 17980 days ago · 0 km deep · 1 km away
23. 1.78 km S of Calistoga, CaliforniaSat, Jul 16, 5:35 AM PDT · 17978 days ago · 6 km deep · 40 km away
24. 1.57 km W of Cobb, CaliforniaMon, Jul 18, 12:19 PM PDT · 17976 days ago · 0 km deep · 2 km away
25. 2.07 km WSW of Cobb, CaliforniaThu, Jul 21, 2:44 PM PDT · 17973 days ago · 3 km deep · 2 km away
26. 1.66 km ESE of Lucerne, CaliforniaFri, Jul 22, 10:56 AM PDT · 17972 days ago · 3 km deep · 31 km away
27. 2.17 km WSW of Cobb, CaliforniaFri, Jul 22, 9:41 PM PDT · 17971 days ago · 0 km deep · 1 km away
28. 2.57 km W of Cobb, CaliforniaFri, Jul 22, 9:42 PM PDT · 17971 days ago · 0 km deep · 1 km away
29. 1.64 km SW of Kenwood, CaliforniaSat, Jul 23, 10:53 AM PDT · 17971 days ago · 9 km deep · 51 km away
30. 2.96 km WSW of Cobb, CaliforniaSun, Jul 24, 2:38 PM PDT · 17970 days ago · 0 km deep · 2 km away
31. 1.75 km E of Hopland, CaliforniaTue, Jul 26, 9:46 PM PDT · 17967 days ago · 2 km deep · 26 km away
32. 2.16 km W of Cobb, CaliforniaThu, Jul 28, 3:45 AM PDT · 17966 days ago · 1 km deep · 2 km away
33. 2.26 km WSW of Cobb, CaliforniaThu, Jul 28, 3:45 AM PDT · 17966 days ago · 1 km deep · 3 km away
34. 2.73 km SW of Napa, CaliforniaFri, Jul 29, 6:59 PM PDT · 17965 days ago · 10 km deep · 74 km away
35. 2.27 km W of Cobb, CaliforniaMon, Aug 1, 11:39 PM PDT · 17961 days ago · 1 km deep · 1 km away
36. 1.64 km WSW of Cobb, CaliforniaWed, Aug 3, 1:07 AM PDT · 17960 days ago · 2 km deep · 5 km away
37. 1.68 km WSW of Cobb, CaliforniaWed, Aug 3, 2:32 AM PDT · 17960 days ago · 0 km deep · 1 km away
38. 1.58 km WSW of Cobb, CaliforniaWed, Aug 3, 2:48 AM PDT · 17960 days ago · 0 km deep · 1 km away
39. 2.08 km W of Cobb, CaliforniaFri, Aug 5, 2:20 PM PDT · 17958 days ago · -1 km deep · 1 km away
40. 1.58 km W of Cobb, CaliforniaFri, Aug 5, 2:22 PM PDT · 17958 days ago · 0 km deep · 1 km away
41. 1.76 km W of Cobb, CaliforniaSat, Aug 6, 4:06 PM PDT · 17957 days ago · 3 km deep · 2 km away
42. 2.219 km NE of Upper Lake, CaliforniaSat, Aug 6, 5:28 PM PDT · 17957 days ago · 3 km deep · 54 km away
43. 1.57 km W of Cobb, CaliforniaMon, Aug 8, 7:06 AM PDT · 17955 days ago · 3 km deep · 2 km away
44. 1.73 km NNE of Clearlake, CaliforniaMon, Aug 8, 11:54 AM PDT · 17955 days ago · 2 km deep · 27 km away
45. 1.67 km W of Cobb, CaliforniaMon, Aug 8, 1:44 PM PDT · 17955 days ago · 4 km deep · 1 km away
46. 1.62 km ENE of Clear Lake Riviera, CaliforniaWed, Aug 10, 5:10 PM PDT · 17953 days ago · 1 km deep · 20 km away
47. 2.214 km NE of Upper Lake, CaliforniaThu, Aug 11, 10:59 PM PDT · 17951 days ago · 10 km deep · 50 km away
48. 2.110 km NE of Healdsburg, CaliforniaMon, Aug 15, 11:03 AM PDT · 17948 days ago · 5 km deep · 17 km away
49. 1.78 km W of Cobb, CaliforniaThu, Aug 18, 12:35 AM PDT · 17945 days ago · 1 km deep · 0 km away
50. 1.64 km WSW of Cobb, CaliforniaFri, Aug 19, 1:40 AM PDT · 17944 days ago · 3 km deep · 5 km away
51. 1.57 km W of Cobb, CaliforniaFri, Aug 19, 7:21 PM PDT · 17943 days ago · 3 km deep · 2 km away
52. 1.812 km NE of Healdsburg, CaliforniaSat, Aug 20, 1:00 PM PDT · 17943 days ago · 3 km deep · 16 km away
53. 1.68 km E of Hidden Valley Lake, CaliforniaSat, Aug 20, 3:26 PM PDT · 17943 days ago · 7 km deep · 32 km away
54. 2.89 km WSW of Cobb, CASun, Aug 21, 8:44 PM PDT · 17941 days ago · 1 km deep · 1 km away
55. 2.06 km WSW of Cobb, CaliforniaMon, Aug 22, 10:42 AM PDT · 17941 days ago · 1 km deep · 2 km away
56. 2.16 km WSW of Cobb, CaliforniaMon, Aug 22, 10:43 AM PDT · 17941 days ago · 1 km deep · 2 km away
57. 1.96 km WSW of Cobb, CaliforniaMon, Aug 22, 10:44 AM PDT · 17941 days ago · 0 km deep · 2 km away
58. 1.96 km WSW of Cobb, CaliforniaMon, Aug 22, 10:44 AM PDT · 17941 days ago · -1 km deep · 2 km away
59. 1.76 km W of Cobb, CaliforniaMon, Aug 22, 11:26 PM PDT · 17940 days ago · 3 km deep · 2 km away

Before

1. 1.64 km NE of Hopland, CaliforniaMon, Jun 20, 11:00 AM PDT · 18004 days ago · 4 km deep · 31 km away
2. 2.36 km W of Cobb, CaliforniaMon, Jun 20, 12:39 AM PDT · 18004 days ago · -1 km deep · 2 km away
3. 1.77 km W of Cobb, CaliforniaThu, Jun 16, 7:47 PM PDT · 18007 days ago · 3 km deep · 1 km away
4. 2.07 km SSW of Calistoga, CaliforniaWed, Jun 15, 10:52 AM PDT · 18009 days ago · 3 km deep · 37 km away
5. 1.85 km WSW of Cobb, CaliforniaMon, Jun 13, 8:59 AM PDT · 18011 days ago · 1 km deep · 4 km away
6. 2.05 km SW of Glen Ellen, CaliforniaFri, Jun 10, 3:08 PM PDT · 18014 days ago · 8 km deep · 57 km away
7. 2.16 km W of Cobb, CaliforniaFri, Jun 10, 12:08 AM PDT · 18014 days ago · 1 km deep · 2 km away
8. 1.95 km WSW of Cobb, CaliforniaThu, Jun 9, 11:00 PM PDT · 18014 days ago · 1 km deep · 4 km away
9. 1.85 km WSW of Glen Ellen, CaliforniaThu, Jun 9, 5:36 PM PDT · 18015 days ago · 7 km deep · 56 km away
10. 1.87 km SSW of Calistoga, CaliforniaThu, Jun 9, 3:20 PM PDT · 18015 days ago · 3 km deep · 37 km away
11. 2.57 km W of Cobb, CaliforniaWed, Jun 8, 6:34 PM PDT · 18016 days ago · 3 km deep · 2 km away
12. 1.87 km W of Cobb, CaliforniaWed, Jun 8, 1:32 PM PDT · 18016 days ago · 3 km deep · 2 km away
13. 1.616 km W of Cloverdale, CaliforniaSun, Jun 5, 8:01 PM PDT · 18018 days ago · 3 km deep · 34 km away
14. 1.89 km NNW of Kenwood, CaliforniaSat, Jun 4, 11:02 AM PDT · 18020 days ago · 7 km deep · 40 km away
15. 1.67 km WSW of Cobb, CaliforniaSat, Jun 4, 5:08 AM PDT · 18020 days ago · 3 km deep · 1 km away
16. 2.18 km WSW of Cobb, CaliforniaFri, Jun 3, 6:49 PM PDT · 18021 days ago · 0 km deep · 1 km away
17. 1.86 km W of Cobb, CaliforniaFri, Jun 3, 6:16 AM PDT · 18021 days ago · 0 km deep · 2 km away
18. 1.87 km WSW of Cobb, CaliforniaThu, Jun 2, 9:14 PM PDT · 18021 days ago · 4 km deep · 2 km away
19. 2.57 km W of Cobb, CaliforniaTue, May 31, 7:33 AM PDT · 18024 days ago · 3 km deep · 2 km away
20. 2.25 km WSW of Moskowite Corner, CaliforniaMon, May 30, 5:16 AM PDT · 18025 days ago · 6 km deep · 67 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1035580. Read Mon, Oct 5, 2026, 1:50 PM UTC.