M1.7 earthquake 4 km WSW of Cobb, California

Magnitude

1.7 (md), micro

Local time

Sun, Jul 9, 1978, 10:27 PM PDT

UTC

1978-07-10 05:27:11 UTC

Depth

3.7 km (2.3 mi), shallow

Epicenter

38.800° N, 122.771° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

66°

Stations used

10

• Cobb, CaliforniaPopulation 1,778. Forecast5 kmWSW
• Clearlake, CaliforniaPopulation 15,182. Forecast22 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast40 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast665 kmNW

After

1. 2.07 km WSW of Cobb, CaliforniaTue, Jul 11, 9:11 AM PDT · 17612 days ago · -1 km deep · 3 km away
2. 1.97 km WSW of Cobb, CaliforniaTue, Jul 11, 9:11 AM PDT · 17612 days ago · 2 km deep · 3 km away
3. 2.07 km W of Cobb, CaliforniaWed, Jul 12, 9:55 PM PDT · 17610 days ago · 4 km deep · 4 km away
4. 2.33 km SW of Oakville, CaliforniaFri, Jul 14, 2:06 PM PDT · 17608 days ago · 9 km deep · 53 km away
5. 1.74 km SE of Calpella, CAFri, Jul 14, 11:24 PM PDT · 17608 days ago · 5 km deep · 57 km away
6. 2.9Northern CaliforniaSat, Jul 15, 7:57 AM PDT · 17608 days ago · 0 km deep · 2 km away
7. 1.7Northern CaliforniaSun, Jul 16, 3:46 PM PDT · 17606 days ago · 1 km deep · 0 km away
8. 1.88 km WSW of Cobb, CaliforniaSun, Jul 16, 6:58 PM PDT · 17606 days ago · 3 km deep · 4 km away
9. 2.45 km WSW of Cobb, CaliforniaSun, Jul 16, 7:02 PM PDT · 17606 days ago · -1 km deep · 1 km away
10. 2.39 km E of Comptche, CaliforniaMon, Jul 17, 1:27 PM PDT · 17605 days ago · 8 km deep · 80 km away
11. 1.98 km ENE of Willits, CaliforniaTue, Jul 18, 6:47 PM PDT · 17604 days ago · 4 km deep · 81 km away
12. 2.17 km NE of Inverness, CaliforniaWed, Jul 19, 6:36 PM PDT · 17603 days ago · 1 km deep · 73 km away
13. 2.00 km N of Kelseyville, CaliforniaThu, Jul 20, 2:23 AM PDT · 17603 days ago · 3 km deep · 21 km away
14. 1.68 km ENE of Willits, CaliforniaThu, Jul 20, 11:22 AM PDT · 17603 days ago · 4 km deep · 81 km away
15. 2.34 km WSW of Cobb, CaliforniaFri, Jul 21, 1:21 AM PDT · 17602 days ago · 1 km deep · 0 km away
16. 1.58 km WSW of Cobb, CaliforniaFri, Jul 21, 12:18 PM PDT · 17601 days ago · 1 km deep · 4 km away
17. 1.67 km W of Cobb, CaliforniaFri, Jul 21, 8:37 PM PDT · 17601 days ago · 0 km deep · 4 km away
18. 1.74 km WSW of Cobb, CaliforniaSun, Jul 23, 7:19 PM PDT · 17599 days ago · 3 km deep · 1 km away
19. 1.57 km W of Cobb, CaliforniaThu, Jul 27, 7:46 AM PDT · 17596 days ago · 4 km deep · 4 km away
20. 2.04 km WSW of Cobb, CaliforniaFri, Jul 28, 1:21 AM PDT · 17595 days ago · 2 km deep · 1 km away
21. 1.81 km NNE of Inverness, CaliforniaFri, Jul 28, 1:09 PM PDT · 17594 days ago · 5 km deep · 77 km away
22. 1.93 km SE of Willows, CaliforniaSat, Jul 29, 1:33 AM PDT · 17594 days ago · 20 km deep · 94 km away
23. 1.911 km SE of Boonville, CaliforniaSun, Jul 30, 8:46 PM PDT · 17592 days ago · 4 km deep · 47 km away
24. 1.77 km WSW of Cobb, CaliforniaTue, Aug 1, 1:08 AM PDT · 17591 days ago · 2 km deep · 3 km away
25. 2.26 km W of Cobb, CaliforniaThu, Aug 3, 5:25 AM PDT · 17589 days ago · 3 km deep · 4 km away
26. 1.710 km ENE of Clearlake Oaks, CaliforniaThu, Aug 3, 10:15 PM PDT · 17588 days ago · -1 km deep · 34 km away
27. 2.320 km WNW of Jenner, CaliforniaSun, Aug 6, 7:25 AM PDT · 17586 days ago · 0 km deep · 56 km away
28. 2.08 km NE of Inverness, CaliforniaTue, Aug 8, 6:36 PM PDT · 17583 days ago · 0 km deep · 72 km away
29. 1.85 km NNE of Crockett, CaliforniaWed, Aug 9, 10:35 AM PDT · 17583 days ago · 1 km deep · 93 km away
30. 1.82 km ESE of Clear Lake Riviera, CaliforniaSat, Aug 12, 11:51 AM PDT · 17579 days ago · 1 km deep · 17 km away
31. 1.52 km ESE of Clear Lake Riviera, CaliforniaSat, Aug 12, 12:01 PM PDT · 17579 days ago · 1 km deep · 17 km away
32. 1.75 km WNW of Cobb, CaliforniaSun, Aug 13, 9:36 PM PDT · 17578 days ago · 3 km deep · 4 km away
33. 2.08 km W of Lakeport, CaliforniaTue, Aug 15, 10:27 AM PDT · 17577 days ago · 4 km deep · 34 km away
34. 2.17 km W of Cobb, CaliforniaWed, Aug 16, 4:34 AM PDT · 17576 days ago · 4 km deep · 4 km away
35. 2.59 km NNW of Redwood Valley, CaliforniaWed, Aug 16, 6:29 AM PDT · 17576 days ago · 2 km deep · 73 km away
36. 1.56 km ESE of Hidden Valley Lake, CaliforniaWed, Aug 16, 3:12 PM PDT · 17575 days ago · 2 km deep · 25 km away
37. 2.715 km E of Angwin, CaliforniaThu, Aug 17, 7:56 AM PDT · 17575 days ago · 0 km deep · 50 km away
38. 2.0Northern CaliforniaThu, Aug 17, 4:20 PM PDT · 17574 days ago · 0 km deep · 25 km away
39. 1.68 km W of Cobb, CaliforniaThu, Aug 17, 8:45 PM PDT · 17574 days ago · 1 km deep · 4 km away
40. 1.88 km W of Cobb, CaliforniaThu, Aug 17, 9:27 PM PDT · 17574 days ago · 0 km deep · 4 km away
41. 2.06 km NE of Willits, CaliforniaSat, Aug 19, 7:47 AM PDT · 17573 days ago · 4 km deep · 85 km away
42. 1.86 km NE of Willits, CaliforniaSat, Aug 19, 2:14 PM PDT · 17572 days ago · 4 km deep · 86 km away
43. 1.86 km NE of Willits, CaliforniaSat, Aug 19, 2:21 PM PDT · 17572 days ago · 4 km deep · 85 km away
44. 2.814 km E of Angwin, CaliforniaSun, Aug 20, 5:06 AM PDT · 17572 days ago · 7 km deep · 49 km away
45. 1.58 km W of Cobb, CaliforniaMon, Aug 21, 4:51 AM PDT · 17571 days ago · 0 km deep · 4 km away
46. 1.59 km W of Cobb, CaliforniaMon, Aug 21, 3:07 PM PDT · 17570 days ago · 0 km deep · 6 km away
47. 1.510 km W of Cobb, CaliforniaWed, Aug 23, 3:59 AM PDT · 17569 days ago · 0 km deep · 6 km away
48. 1.87 km W of Cobb, CaliforniaWed, Aug 23, 2:13 PM PDT · 17568 days ago · 3 km deep · 4 km away
49. 1.53 km ENE of Calpella, CaliforniaThu, Aug 24, 12:09 PM PDT · 17567 days ago · 5 km deep · 60 km away
50. 2.37 km WSW of Cobb, CaliforniaThu, Aug 24, 10:23 PM PDT · 17567 days ago · 1 km deep · 3 km away
51. 1.98 km WSW of Cobb, CaliforniaThu, Aug 24, 11:18 PM PDT · 17567 days ago · 3 km deep · 3 km away
52. 2.63 km WSW of Moskowite Corner, CaliforniaSat, Aug 26, 4:10 PM PDT · 17565 days ago · 5 km deep · 62 km away
53. 2.43 km W of Moskowite Corner, CaliforniaSat, Aug 26, 5:38 PM PDT · 17565 days ago · 8 km deep · 62 km away
54. 3.20 km WSW of Monument Hills, CaliforniaSun, Aug 27, 9:42 PM PDT · 17564 days ago · 8 km deep · 79 km away
55. 2.22 km SSE of Monument Hills, CaliforniaTue, Aug 29, 1:24 PM PDT · 17562 days ago · 9 km deep · 80 km away
56. 1.88 km E of Hopland, CaliforniaWed, Aug 30, 10:49 PM PDT · 17561 days ago · 6 km deep · 29 km away
57. 2.07 km W of Cobb, CaliforniaThu, Aug 31, 12:41 AM PDT · 17561 days ago · 3 km deep · 4 km away
58. 2.27 km W of Cobb, CaliforniaThu, Aug 31, 3:39 AM PDT · 17561 days ago · 3 km deep · 4 km away
59. 1.98 km E of Willits, CaliforniaFri, Sep 1, 1:01 PM PDT · 17559 days ago · 4 km deep · 79 km away
60. 2.09 km NE of Inverness, CaliforniaFri, Sep 1, 7:34 PM PDT · 17559 days ago · 4 km deep · 72 km away

The first 60 of 75.

Before

1. 2.16 km NE of Inverness, CaliforniaSat, Jul 8, 12:07 PM PDT · 17614 days ago · 0 km deep · 74 km away
2. 1.611 km ENE of Healdsburg, CaliforniaThu, Jul 6, 10:14 PM PDT · 17616 days ago · 5 km deep · 15 km away
3. 1.67 km W of Cobb, CaliforniaWed, Jul 5, 11:23 AM PDT · 17618 days ago · 4 km deep · 4 km away
4. 1.57 km W of Cobb, CaliforniaWed, Jul 5, 12:31 AM PDT · 17618 days ago · 1 km deep · 4 km away
5. 1.511 km NE of Healdsburg, CaliforniaTue, Jul 4, 4:15 AM PDT · 17619 days ago · 4 km deep · 13 km away
6. 1.711 km NE of Healdsburg, CaliforniaMon, Jul 3, 3:11 PM PDT · 17619 days ago · 6 km deep · 15 km away
7. 1.817 km NNE of Nice, CaliforniaMon, Jul 3, 1:26 PM PDT · 17619 days ago · 9 km deep · 51 km away
8. 2.317 km NNE of Nice, CaliforniaMon, Jul 3, 1:14 PM PDT · 17619 days ago · 11 km deep · 51 km away
9. 2.610 km ENE of Healdsburg, CaliforniaMon, Jul 3, 10:58 AM PDT · 17620 days ago · 7 km deep · 15 km away
10. 2.11 km WNW of Moskowite Corner, CaliforniaSat, Jul 1, 7:48 PM PDT · 17621 days ago · 12 km deep · 63 km away
11. 1.65 km N of Larkfield-Wikiup, CaliforniaSat, Jul 1, 6:38 AM PDT · 17622 days ago · 5 km deep · 27 km away
12. 1.97 km W of Cobb, CaliforniaSat, Jul 1, 6:35 AM PDT · 17622 days ago · 3 km deep · 4 km away
13. 1.68 km WSW of Cobb, CaliforniaSat, Jul 1, 2:23 AM PDT · 17622 days ago · 1 km deep · 4 km away
14. 1.96 km WNW of Cobb, CaliforniaWed, Jun 28, 3:39 PM PDT · 17624 days ago · 2 km deep · 4 km away
15. 1.66 km E of Calpella, CaliforniaWed, Jun 28, 2:36 AM PDT · 17625 days ago · 4 km deep · 56 km away
16. 2.48 km W of Cobb, CaliforniaTue, Jun 27, 5:52 PM PDT · 17625 days ago · -1 km deep · 5 km away
17. 1.63 km NNE of Cloverdale, CaliforniaTue, Jun 27, 11:40 AM PDT · 17626 days ago · 5 km deep · 21 km away
18. 2.36 km W of Cobb, CaliforniaSun, Jun 25, 7:33 AM PDT · 17628 days ago · 4 km deep · 3 km away
19. 1.5Northern CaliforniaFri, Jun 23, 12:06 PM PDT · 17629 days ago · 5 km deep · 20 km away
20. 1.6Northern CaliforniaFri, Jun 23, 11:43 AM PDT · 17629 days ago · 4 km deep · 4 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1040971. Read Tue, Sep 29, 2026, 6:12 AM UTC.