M1.7 earthquake 2 km N of Comptche, California

Magnitude

1.7 (md), micro

Local time

Fri, Jul 27, 1979, 3:43 AM PDT

UTC

1979-07-27 10:43:08 UTC

Depth

4.2 km (2.6 mi), shallow

Epicenter

39.283° N, 123.595° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 2.0 km horizontally, 9.1 km in depth

Magnitude uncertainty

±0.38

Depth from

From location

Station coverage gap

263°, poorly surrounded by stations

Stations used

4

• Mendocino, CaliforniaPopulation 894. Forecast18 kmE
• Ukiah, CaliforniaPopulation 15,917. Forecast36 kmWNW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast121 kmNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast752 kmNW

After

1. 1.97 km WSW of Cobb, CaliforniaFri, Jul 27, 9:55 AM PDT · 17230 days ago · -1 km deep · 87 km away
2. 1.92 km WNW of Redwood Valley, CaliforniaFri, Jul 27, 6:02 PM PDT · 17230 days ago · 6 km deep · 31 km away
3. 1.56 km W of Cobb, CaliforniaSat, Jul 28, 5:19 AM PDT · 17229 days ago · 3 km deep · 86 km away
4. 2.64 km E of Philo, CaliforniaSun, Jul 29, 5:16 AM PDT · 17228 days ago · 5 km deep · 30 km away
5. 1.64 km WSW of Cobb, CaliforniaMon, Jul 30, 12:38 PM PDT · 17227 days ago · 3 km deep · 89 km away
6. 2.48 km WSW of Cobb, CaliforniaMon, Jul 30, 7:47 PM PDT · 17227 days ago · 4 km deep · 86 km away
7. 2.39 km WSW of Cobb, CaliforniaThu, Aug 2, 3:22 AM PDT · 17224 days ago · 1 km deep · 85 km away
8. 1.78 km NNE of Hopland, CaliforniaFri, Aug 3, 6:59 PM PDT · 17223 days ago · 1 km deep · 52 km away
9. 2.17 km WSW of Cobb, CaliforniaSat, Aug 4, 6:55 PM PDT · 17222 days ago · -1 km deep · 86 km away
10. 2.97 km E of Covelo, CaliforniaTue, Aug 7, 9:18 AM PDT · 17219 days ago · -1 km deep · 68 km away
11. 2.12 km NNE of Talmage, CaliforniaTue, Aug 7, 1:47 PM PDT · 17219 days ago · 6 km deep · 41 km away
12. 1.92 km WNW of Redwood Valley, CaliforniaTue, Aug 7, 8:40 PM PDT · 17219 days ago · 6 km deep · 31 km away
13. 2.05 km SSW of Boonville, CaliforniaFri, Aug 10, 12:45 AM PDT · 17216 days ago · 4 km deep · 40 km away
14. 1.83 km NNE of Hopland, CaliforniaFri, Aug 10, 5:28 AM PDT · 17216 days ago · 3 km deep · 53 km away
15. 3.46 km WSW of Cobb, CaliforniaSun, Aug 12, 4:07 PM PDT · 17214 days ago · -1 km deep · 87 km away
16. 1.57 km WSW of Cobb, CaliforniaSun, Aug 12, 4:16 PM PDT · 17214 days ago · 6 km deep · 87 km away
17. 1.64 km WSW of Cobb, CaliforniaMon, Aug 13, 12:08 AM PDT · 17213 days ago · 3 km deep · 89 km away
18. 1.77 km W of Cobb, CaliforniaTue, Aug 14, 4:46 PM PDT · 17212 days ago · 3 km deep · 86 km away
19. 1.66 km WSW of Cobb, CaliforniaWed, Aug 15, 12:11 AM PDT · 17211 days ago · 0 km deep · 87 km away
20. 1.53 km ENE of Redway, CaliforniaWed, Aug 15, 3:25 AM PDT · 17211 days ago · 21 km deep · 96 km away
21. 2.44 km SE of Calpella, CaliforniaWed, Aug 15, 5:43 AM PDT · 17211 days ago · 6 km deep · 38 km away
22. 1.74 km NE of Ukiah, CaliforniaWed, Aug 15, 6:04 AM PDT · 17211 days ago · 3 km deep · 38 km away
23. 1.74 km SE of Calpella, CaliforniaWed, Aug 15, 11:14 PM PDT · 17210 days ago · 6 km deep · 38 km away
24. 1.57 km W of Cobb, CaliforniaThu, Aug 16, 11:13 AM PDT · 17210 days ago · 3 km deep · 86 km away
25. 1.810 km W of Shelter Cove, CaliforniaFri, Aug 17, 9:51 PM PDT · 17209 days ago · 3 km deep · 96 km away
26. 1.53 km WSW of Cobb, CaliforniaMon, Aug 20, 9:15 PM PDT · 17206 days ago · 6 km deep · 89 km away
27. 2.44 km WSW of Cobb, CaliforniaTue, Aug 21, 9:24 AM PDT · 17205 days ago · 1 km deep · 89 km away
28. 1.54 km WSW of Cobb, CaliforniaTue, Aug 21, 9:25 AM PDT · 17205 days ago · 2 km deep · 89 km away
29. 2.87 km WSW of Cobb, CaliforniaWed, Aug 22, 10:22 PM PDT · 17203 days ago · 1 km deep · 86 km away
30. 1.74 km WSW of Cobb, CaliforniaSat, Aug 25, 8:13 PM PDT · 17201 days ago · 3 km deep · 89 km away
31. 1.69 km WSW of Cobb, CaliforniaTue, Aug 28, 7:20 PM PDT · 17198 days ago · 1 km deep · 85 km away
32. 1.56 km W of Cobb, CaliforniaWed, Aug 29, 1:21 AM PDT · 17197 days ago · 3 km deep · 86 km away
33. 2.511 km NNW of Potter Valley, CaliforniaWed, Aug 29, 10:47 PM PDT · 17196 days ago · 9 km deep · 39 km away
34. 1.77 km W of Cobb, CaliforniaThu, Aug 30, 2:50 AM PDT · 17196 days ago · 3 km deep · 85 km away
35. 1.93 km SSE of Clear Lake Riviera, CaliforniaSat, Sep 1, 2:10 AM PDT · 17194 days ago · 3 km deep · 86 km away
36. 3.44 km SE of Calpella, CaliforniaSun, Sep 2, 12:37 AM PDT · 17193 days ago · 7 km deep · 38 km away
37. 1.54 km SE of Calpella, CaliforniaSun, Sep 2, 1:01 AM PDT · 17193 days ago · 6 km deep · 38 km away
38. 1.67 km WSW of Cobb, CaliforniaSun, Sep 2, 9:04 AM PDT · 17193 days ago · 2 km deep · 86 km away
39. 2.010 km NE of Boonville, CaliforniaSun, Sep 2, 10:00 AM PDT · 17193 days ago · 26 km deep · 34 km away
40. 1.734 km SSW of Sea Ranch, CaliforniaSun, Sep 2, 8:49 PM PDT · 17193 days ago · 5 km deep · 94 km away
41. 1.624 km S of Sea Ranch, CaliforniaMon, Sep 3, 3:04 AM PDT · 17192 days ago · 37 km deep · 88 km away
42. 1.9near the coast of Northern CaliforniaMon, Sep 3, 3:19 AM PDT · 17192 days ago · 48 km deep · 90 km away
43. 2.39 km WSW of Cobb, CaliforniaMon, Sep 3, 11:18 AM PDT · 17192 days ago · 1 km deep · 85 km away
44. 1.86 km W of Cobb, CaliforniaTue, Sep 4, 12:21 AM PDT · 17191 days ago · 3 km deep · 86 km away
45. 1.64 km WSW of Cobb, CaliforniaTue, Sep 4, 6:06 PM PDT · 17191 days ago · 4 km deep · 88 km away
46. 1.64 km SE of Calpella, CaliforniaTue, Sep 4, 7:11 PM PDT · 17191 days ago · 5 km deep · 38 km away
47. 1.59 km WSW of Cobb, CaliforniaFri, Sep 7, 7:02 AM PDT · 17188 days ago · 1 km deep · 85 km away
48. 1.67 km W of Cobb, CaliforniaFri, Sep 7, 6:01 PM PDT · 17188 days ago · 1 km deep · 86 km away
49. 1.67 km SSW of Kelseyville, CaliforniaSun, Sep 9, 11:15 AM PDT · 17186 days ago · 1 km deep · 75 km away
50. 1.527 km WSW of Leggett, CaliforniaSun, Sep 9, 6:44 PM PDT · 17186 days ago · 8 km deep · 64 km away
51. 2.58 km W of Cobb, CaliforniaMon, Sep 10, 6:25 AM PDT · 17185 days ago · -1 km deep · 85 km away
52. 2.116 km NE of Upper Lake, CaliforniaWed, Sep 12, 3:37 AM PDT · 17183 days ago · 1 km deep · 70 km away
53. 1.87 km W of Cobb, CaliforniaWed, Sep 12, 10:57 AM PDT · 17183 days ago · 1 km deep · 84 km away
54. 1.912 km S of Comptche, CaliforniaThu, Sep 13, 11:27 PM PDT · 17181 days ago · 10 km deep · 15 km away
55. 1.618 km NNE of Upper Lake, CaliforniaSat, Sep 15, 12:57 AM PDT · 17180 days ago · 24 km deep · 68 km away
56. 1.712 km N of Philo, CaliforniaSat, Sep 15, 6:34 AM PDT · 17180 days ago · 6 km deep · 16 km away
57. 2.622 km NE of Potter Valley, CaliforniaSat, Sep 15, 11:22 AM PDT · 17180 days ago · 8 km deep · 59 km away
58. 2.67 km WSW of Cobb, CaliforniaSat, Sep 15, 4:35 PM PDT · 17180 days ago · 2 km deep · 86 km away
59. 2.25 km SW of Laytonville, CaliforniaSat, Sep 15, 7:57 PM PDT · 17180 days ago · -1 km deep · 41 km away
60. 1.57 km W of Cobb, CaliforniaSat, Sep 15, 9:27 PM PDT · 17180 days ago · 3 km deep · 86 km away

The first 60 of 69.

Before

1. 2.115 km WSW of Leggett, CaliforniaThu, Jul 26, 11:23 PM PDT · 17230 days ago · -1 km deep · 61 km away
2. 1.56 km ENE of Hopland, CaliforniaThu, Jul 26, 9:41 AM PDT · 17231 days ago · 7 km deep · 57 km away
3. 2.46 km WSW of Cobb, CaliforniaTue, Jul 24, 10:03 PM PDT · 17233 days ago · 1 km deep · 88 km away
4. 1.76 km W of Cobb, CaliforniaTue, Jul 24, 4:02 PM PDT · 17233 days ago · 4 km deep · 86 km away
5. 2.17 km WSW of Cobb, CaliforniaSun, Jul 22, 2:04 PM PDT · 17235 days ago · 2 km deep · 86 km away
6. 1.914 km E of Potter Valley, CaliforniaSun, Jul 22, 9:55 AM PDT · 17235 days ago · 9 km deep · 57 km away
7. 1.76 km WSW of Cobb, CaliforniaSat, Jul 21, 4:58 PM PDT · 17236 days ago · 1 km deep · 87 km away
8. 1.65 km NE of Ukiah, CaliforniaFri, Jul 20, 8:28 PM PDT · 17237 days ago · 2 km deep · 38 km away
9. 2.817 km WSW of Paskenta, CaliforniaFri, Jul 20, 1:35 AM PDT · 17237 days ago · 2 km deep · 96 km away
10. 1.95 km SE of Calpella, CaliforniaFri, Jul 20, 12:46 AM PDT · 17237 days ago · 0 km deep · 38 km away
11. 2.05 km SE of Calpella, CaliforniaThu, Jul 19, 9:27 AM PDT · 17238 days ago · 3 km deep · 38 km away
12. 1.69 km W of Cobb, CaliforniaTue, Jul 17, 11:25 AM PDT · 17240 days ago · 1 km deep · 84 km away
13. 1.911 km N of Upper Lake, CaliforniaTue, Jul 17, 11:08 AM PDT · 17240 days ago · 3 km deep · 60 km away
14. 1.818 km NNE of Nice, CaliforniaTue, Jul 17, 12:40 AM PDT · 17240 days ago · 10 km deep · 74 km away
15. 2.37 km W of Cobb, CaliforniaMon, Jul 16, 12:58 PM PDT · 17241 days ago · 1 km deep · 85 km away
16. 2.38 km WSW of Cobb, CaliforniaMon, Jul 16, 8:12 AM PDT · 17241 days ago · 0 km deep · 86 km away
17. 1.82 km E of Comptche, CaliforniaSun, Jul 15, 11:18 PM PDT · 17241 days ago · 8 km deep · 3 km away
18. 2.35 km E of Comptche, CaliforniaSun, Jul 15, 8:38 PM PDT · 17242 days ago · 8 km deep · 6 km away
19. 1.66 km WSW of Cobb, CaliforniaThu, Jul 12, 8:01 AM PDT · 17245 days ago · 0 km deep · 87 km away
20. 1.64 km WSW of Cobb, CaliforniaThu, Jul 12, 2:37 AM PDT · 17245 days ago · 3 km deep · 89 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1046788. Read Mon, Sep 28, 2026, 4:40 PM UTC.