M1.7 earthquake 8km W of Cobb, CA

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Oct 21, 2021, 3:35 AM PDT

UTC

2021-10-21 10:35:36 UTC

Depth

2.8 km (1.7 mi), shallow

Epicenter

38.833° N, 122.810° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.2 km in depth

Magnitude uncertainty

±0.15

Depth from

From location

Station coverage gap

38°

Stations used

52

• Cobb, CaliforniaPopulation 1,778. Forecast8 kmW
• Clearlake, CaliforniaPopulation 15,182. Forecast21 kmSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast44 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast670 kmNW

After

1. 1.88km NNW of Redwood Valley, CAFri, Oct 22, 6:10 AM PDT · 1808 days ago · 7 km deep · 67 km away
2. 1.66km W of Cobb, CAFri, Oct 22, 9:46 AM PDT · 1808 days ago · 2 km deep · 1 km away
3. 2.97km W of Cobb, CAFri, Oct 22, 9:26 PM PDT · 1807 days ago · 2 km deep · 1 km away · felt by 13
4. 2.77km W of Cobb, CAFri, Oct 22, 9:28 PM PDT · 1807 days ago · 2 km deep · 1 km away · felt by 3
5. 1.57km W of Cobb, CAFri, Oct 22, 9:28 PM PDT · 1807 days ago · 1 km deep · 1 km away
6. 1.52km NNE of The Geysers, CAFri, Oct 22, 9:54 PM PDT · 1807 days ago · 1 km deep · 7 km away
7. 1.84km W of Cobb, CAFri, Oct 22, 10:29 PM PDT · 1807 days ago · 2 km deep · 4 km away
8. 1.57km W of Cobb, CAFri, Oct 22, 10:40 PM PDT · 1807 days ago · 2 km deep · 1 km away
9. 1.66km NW of The Geysers, CASat, Oct 23, 12:23 AM PDT · 1807 days ago · 3 km deep · 2 km away
10. 1.95km ENE of Boonville, CASat, Oct 23, 12:18 PM PDT · 1807 days ago · 4 km deep · 49 km away
11. 1.910km WNW of The Geysers, CASat, Oct 23, 7:57 PM PDT · 1806 days ago · 3 km deep · 4 km away
12. 2.810km WNW of The Geysers, CASat, Oct 23, 8:53 PM PDT · 1806 days ago · 3 km deep · 4 km away · felt by 5
13. 1.610km WNW of The Geysers, CASat, Oct 23, 8:54 PM PDT · 1806 days ago · 2 km deep · 4 km away
14. 1.710km WNW of The Geysers, CASat, Oct 23, 8:54 PM PDT · 1806 days ago · 3 km deep · 4 km away
15. 2.610km WNW of The Geysers, CASat, Oct 23, 9:09 PM PDT · 1806 days ago · 3 km deep · 4 km away · felt by 1
16. 1.74km ENE of Boonville, CASat, Oct 23, 9:53 PM PDT · 1806 days ago · 4 km deep · 49 km away
17. 2.67km WNW of Cobb, CASun, Oct 24, 4:10 AM PDT · 1806 days ago · 3 km deep · 0 km away · felt by 3
18. 1.82km SSW of Anderson Springs, CASun, Oct 24, 6:58 PM PDT · 1806 days ago · 1 km deep · 13 km away
19. 1.86km NW of The Geysers, CASun, Oct 24, 9:06 PM PDT · 1805 days ago · 3 km deep · 2 km away
20. 1.86km NW of The Geysers, CAMon, Oct 25, 2:21 AM PDT · 1805 days ago · 3 km deep · 2 km away
21. 1.76km NNW of The Geysers, CAMon, Oct 25, 2:31 AM PDT · 1805 days ago · 3 km deep · 1 km away
22. 2.34km SE of Larkfield-Wikiup, CAMon, Oct 25, 4:47 AM PDT · 1805 days ago · 8 km deep · 39 km away · felt by 9
23. 2.42km N of The Geysers, CAMon, Oct 25, 5:01 AM PDT · 1805 days ago · 2 km deep · 6 km away · felt by 2
24. 1.53km NNW of The Geysers, CAMon, Oct 25, 2:04 PM PDT · 1805 days ago · 4 km deep · 5 km away
25. 1.710km WNW of The Geysers, CAMon, Oct 25, 2:04 PM PDT · 1805 days ago · 2 km deep · 4 km away
26. 1.85km NNW of The Geysers, CAMon, Oct 25, 6:55 PM PDT · 1805 days ago · 2 km deep · 3 km away
27. 2.07km W of Kenwood, CAMon, Oct 25, 7:39 PM PDT · 1804 days ago · 5 km deep · 48 km away · felt by 3
28. 1.86km W of Cobb, CATue, Oct 26, 12:15 AM PDT · 1804 days ago · 1 km deep · 2 km away
29. 2.92km SW of Anderson Springs, CATue, Oct 26, 11:38 AM PDT · 1804 days ago · 1 km deep · 12 km away · felt by 5
30. 2.03km SSW of Anderson Springs, CATue, Oct 26, 11:40 AM PDT · 1804 days ago · 1 km deep · 14 km away
31. 1.718km SE of Lake Pillsbury, CATue, Oct 26, 1:45 PM PDT · 1804 days ago · 5 km deep · 53 km away
32. 1.67km NW of The Geysers, CATue, Oct 26, 6:31 PM PDT · 1804 days ago · 2 km deep · 1 km away
33. 1.97km NW of The Geysers, CATue, Oct 26, 6:31 PM PDT · 1804 days ago · 1 km deep · 1 km away
34. 1.61km NNW of The Geysers, CAWed, Oct 27, 1:04 PM PDT · 1803 days ago · 2 km deep · 7 km away
35. 1.612km WNW of Redwood Valley, CAWed, Oct 27, 8:23 PM PDT · 1802 days ago · 6 km deep · 69 km away
36. 1.817km NW of Lake Pillsbury, CASat, Oct 30, 8:35 AM PDT · 1800 days ago · -1 km deep · 79 km away
37. 2.110km SSE of Talmage, CASat, Oct 30, 8:53 AM PDT · 1800 days ago · 7 km deep · 36 km away
38. 1.910km SSE of Talmage, CASat, Oct 30, 3:06 PM PDT · 1800 days ago · 6 km deep · 36 km away
39. 1.98km NW of The Geysers, CASat, Oct 30, 8:29 PM PDT · 1799 days ago · 2 km deep · 1 km away
40. 1.52km N of The Geysers, CASun, Oct 31, 8:15 AM PDT · 1799 days ago · 4 km deep · 6 km away
41. 1.51km NNW of The Geysers, CASun, Oct 31, 2:10 PM PDT · 1799 days ago · 2 km deep · 7 km away
42. 1.813km SE of Laytonville, CAMon, Nov 1, 3:49 AM PDT · 1798 days ago · 6 km deep · 99 km away
43. 1.813km SE of Laytonville, CAMon, Nov 1, 12:33 PM PDT · 1798 days ago · 6 km deep · 98 km away
44. 1.52km WSW of Anderson Springs, CATue, Nov 2, 3:50 AM PDT · 1797 days ago · 2 km deep · 11 km away
45. 1.76km NW of The Geysers, CATue, Nov 2, 6:32 AM PDT · 1797 days ago · 3 km deep · 2 km away
46. 1.56km W of Cobb, CATue, Nov 2, 11:12 AM PDT · 1797 days ago · 2 km deep · 2 km away
47. 1.99km NW of The Geysers, CATue, Nov 2, 5:02 PM PDT · 1797 days ago · 1 km deep · 1 km away
48. 1.511km WNW of The Geysers, CAWed, Nov 3, 4:01 AM PDT · 1796 days ago · 3 km deep · 5 km away
49. 1.96km NW of The Geysers, CAWed, Nov 3, 7:36 PM PDT · 1795 days ago · 1 km deep · 2 km away
50. 1.618km NNE of Angwin, CAThu, Nov 4, 3:40 AM PDT · 1795 days ago · 9 km deep · 41 km away · felt by 1
51. 1.72km ESE of The Geysers, CAThu, Nov 4, 5:51 PM PDT · 1795 days ago · 1 km deep · 10 km away
52. 1.93km NE of The Geysers, CAThu, Nov 4, 10:35 PM PDT · 1794 days ago · 2 km deep · 8 km away · felt by 1
53. 2.88km W of Cobb, CAThu, Nov 4, 11:59 PM PDT · 1794 days ago · 2 km deep · 0 km away · felt by 13
54. 1.81km W of The Geysers, CASat, Nov 6, 2:03 AM PDT · 1793 days ago · 1 km deep · 7 km away
55. 1.92km SW of Cobb, CASat, Nov 6, 4:20 AM PDT · 1793 days ago · 2 km deep · 7 km away · felt by 1
56. 1.617km NW of Lake Pillsbury, CASat, Nov 6, 9:59 AM PDT · 1793 days ago · 3 km deep · 79 km away · felt by 2
57. 1.56km E of Willits, CASat, Nov 6, 5:20 PM PDT · 1793 days ago · 6 km deep · 77 km away
58. 2.48km E of Willits, CASat, Nov 6, 9:15 PM PDT · 1792 days ago · 7 km deep · 74 km away
59. 1.78km E of Willits, CASun, Nov 7, 4:01 AM PST · 1792 days ago · 7 km deep · 74 km away
60. 2.12km ENE of The Geysers, CASun, Nov 7, 4:25 AM PST · 1792 days ago · 2 km deep · 9 km away · felt by 1

The first 60 of 167.

Before

1. 1.75km W of Cobb, CAWed, Oct 20, 10:13 PM PDT · 1809 days ago · 0 km deep · 3 km away
2. 1.96km WNW of The Geysers, CAWed, Oct 20, 9:56 PM PDT · 1809 days ago · 3 km deep · 4 km away · felt by 1
3. 1.96km WNW of The Geysers, CAWed, Oct 20, 9:56 PM PDT · 1809 days ago · 3 km deep · 4 km away
4. 1.814km ESE of Lake Pillsbury, CAWed, Oct 20, 5:28 PM PDT · 1810 days ago · 7 km deep · 57 km away
5. 1.61km NNE of The Geysers, CAWed, Oct 20, 1:45 PM PDT · 1810 days ago · 0 km deep · 7 km away
6. 2.75km WNW of The Geysers, CATue, Oct 19, 10:20 PM PDT · 1810 days ago · 3 km deep · 5 km away
7. 1.93km N of The Geysers, CATue, Oct 19, 9:05 PM PDT · 1810 days ago · 0 km deep · 6 km away
8. 1.53km N of The Geysers, CATue, Oct 19, 9:05 PM PDT · 1810 days ago · 0 km deep · 5 km away
9. 3.11km NNW of The Geysers, CATue, Oct 19, 9:05 PM PDT · 1810 days ago · 2 km deep · 7 km away · felt by 17
10. 1.910km NE of Navarro Head, CATue, Oct 19, 7:51 PM PDT · 1810 days ago · 0 km deep · 89 km away
11. 1.61km NNW of The Geysers, CATue, Oct 19, 1:13 PM PDT · 1811 days ago · 2 km deep · 7 km away
12. 1.78km W of Cobb, CAMon, Oct 18, 2:40 PM PDT · 1812 days ago · 2 km deep · 0 km away
13. 1.52km NNW of The Geysers, CAMon, Oct 18, 11:30 AM PDT · 1812 days ago · 1 km deep · 6 km away
14. 2.03km WNW of Cobb, CAMon, Oct 18, 12:09 AM PDT · 1812 days ago · 1 km deep · 5 km away
15. 1.815km ESE of Hidden Valley Lake, CASun, Oct 17, 4:24 PM PDT · 1813 days ago · 4 km deep · 36 km away
16. 2.44km NW of The Geysers, CASun, Oct 17, 7:53 AM PDT · 1813 days ago · 1 km deep · 4 km away
17. 1.67km WNW of Cobb, CASun, Oct 17, 2:47 AM PDT · 1813 days ago · 2 km deep · 1 km away
18. 1.79km NW of The Geysers, CASun, Oct 17, 1:27 AM PDT · 1813 days ago · 2 km deep · 3 km away
19. 1.89km WNW of The Geysers, CASun, Oct 17, 1:27 AM PDT · 1813 days ago · 2 km deep · 3 km away
20. 1.62km NE of The Geysers, CASat, Oct 16, 2:27 PM PDT · 1814 days ago · 2 km deep · 8 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73642345. Read Sun, Oct 4, 2026, 1:56 PM UTC.