M1.8 earthquake 5km NW of Point Arena, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sat, Dec 4, 2021, 11:57 AM PST

UTC

2021-12-04 19:57:00 UTC

Depth

2.6 km (1.6 mi), shallow

Epicenter

38.943° N, 123.745° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.7 km horizontally, 2.4 km in depth

Magnitude uncertainty

±0.10

Depth from

From location

Station coverage gap

237°, poorly surrounded by stations

Stations used

15

• Boonville, CaliforniaPopulation 1,035. Forecast34 kmWSW
• Ukiah, CaliforniaPopulation 15,917. Forecast52 kmWSW
• Santa Rosa, CaliforniaPopulation 178,127. Forecast105 kmWNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast733 kmNW

After

1. 2.51km NW of The Geysers, CASun, Dec 5, 1:07 AM PST · 1764 days ago · 1 km deep · 86 km away · felt by 1
2. 2.23km NNW of The Geysers, CASun, Dec 5, 1:08 AM PST · 1764 days ago · 1 km deep · 86 km away
3. 1.82km ESE of The Geysers, CASun, Dec 5, 3:50 AM PST · 1764 days ago · 3 km deep · 89 km away
4. 1.62km NE of The Geysers, CAMon, Dec 6, 5:42 AM PST · 1763 days ago · 2 km deep · 88 km away
5. 1.77km W of Cobb, CAMon, Dec 6, 4:55 PM PST · 1762 days ago · 3 km deep · 82 km away
6. 1.92km E of The Geysers, CAMon, Dec 6, 5:04 PM PST · 1762 days ago · 1 km deep · 90 km away
7. 1.66km WNW of Cobb, CATue, Dec 7, 1:27 AM PST · 1762 days ago · 2 km deep · 83 km away
8. 1.53km ESE of The Geysers, CATue, Dec 7, 9:39 AM PST · 1761 days ago · 1 km deep · 90 km away
9. 1.61km ESE of The Geysers, CAWed, Dec 8, 4:12 AM PST · 1761 days ago · 1 km deep · 88 km away
10. 1.81km NE of The Geysers, CAWed, Dec 8, 11:37 PM PST · 1760 days ago · 0 km deep · 88 km away
11. 1.514km E of Boonville, CAThu, Dec 9, 2:08 AM PST · 1760 days ago · 7 km deep · 47 km away
12. 2.04km WNW of The Geysers, CAThu, Dec 9, 12:06 PM PST · 1759 days ago · 1 km deep · 84 km away
13. 1.72km W of Anderson Springs, CAThu, Dec 9, 12:07 PM PST · 1759 days ago · 2 km deep · 91 km away
14. 1.59km WNW of Cobb, CAFri, Dec 10, 5:15 AM PST · 1759 days ago · 2 km deep · 81 km away
15. 1.712km N of Brooktrails, CAFri, Dec 10, 2:00 PM PST · 1758 days ago · 7 km deep · 74 km away
16. 2.212km N of Brooktrails, CAFri, Dec 10, 2:00 PM PST · 1758 days ago · 8 km deep · 74 km away
17. 1.62km NW of The Geysers, CAFri, Dec 10, 7:41 PM PST · 1758 days ago · 3 km deep · 86 km away
18. 1.74km NNW of Larkfield-Wikiup, CAFri, Dec 10, 10:19 PM PST · 1758 days ago · 9 km deep · 96 km away
19. 1.97km W of Cobb, CASat, Dec 11, 8:01 AM PST · 1758 days ago · 2 km deep · 82 km away
20. 1.67km W of Cobb, CASat, Dec 11, 8:09 AM PST · 1758 days ago · 2 km deep · 82 km away
21. 1.95km NNE of Fort Bragg, CASat, Dec 11, 11:50 AM PST · 1757 days ago · 8 km deep · 60 km away · felt by 3
22. 1.63km NW of The Geysers, CASun, Dec 12, 11:38 AM PST · 1756 days ago · 1 km deep · 85 km away
23. 1.74km W of Cobb, CASun, Dec 12, 10:23 PM PST · 1756 days ago · 2 km deep · 86 km away
24. 1.510km NW of The Geysers, CAMon, Dec 13, 12:46 AM PST · 1756 days ago · 2 km deep · 79 km away
25. 1.97km WSW of The Geysers, CAMon, Dec 13, 10:20 AM PST · 1755 days ago · 4 km deep · 82 km away
26. 1.71km NE of The Geysers, CAMon, Dec 13, 11:51 AM PST · 1755 days ago · 2 km deep · 88 km away
27. 1.55km NNE of Clearlake, CATue, Dec 14, 7:36 AM PST · 1755 days ago · 5 km deep · 99 km away
28. 1.55km NW of The Geysers, CATue, Dec 14, 9:41 AM PST · 1754 days ago · 3 km deep · 83 km away
29. 1.87km WNW of Cobb, CATue, Dec 14, 3:29 PM PST · 1754 days ago · 2 km deep · 83 km away
30. 2.68km WNW of Cobb, CATue, Dec 14, 4:35 PM PST · 1754 days ago · 2 km deep · 82 km away · felt by 2
31. 1.63km E of The Geysers, CATue, Dec 14, 5:13 PM PST · 1754 days ago · 1 km deep · 90 km away
32. 2.020km ESE of Navarro Head, CATue, Dec 14, 6:39 PM PST · 1754 days ago · 3 km deep · 23 km away
33. 1.73km W of Anderson Springs, CAWed, Dec 15, 6:19 AM PST · 1754 days ago · 1 km deep · 90 km away
34. 1.516km E of Mendocino, CAThu, Dec 16, 4:34 PM PST · 1752 days ago · 8 km deep · 45 km away
35. 2.05km W of Cobb, CAFri, Dec 17, 3:31 PM PST · 1751 days ago · 2 km deep · 84 km away
36. 2.00km NE of The Geysers, CAFri, Dec 17, 9:46 PM PST · 1751 days ago · 1 km deep · 88 km away
37. 1.57km W of Cobb, CASat, Dec 18, 2:09 AM PST · 1751 days ago · 1 km deep · 83 km away
38. 1.66km ESE of Redwood Valley, CASat, Dec 18, 5:48 AM PST · 1751 days ago · 2 km deep · 63 km away
39. 2.18km W of Cobb, CASat, Dec 18, 8:19 AM PST · 1751 days ago · 3 km deep · 82 km away
40. 1.61km NW of The Geysers, CASat, Dec 18, 8:37 AM PST · 1751 days ago · 2 km deep · 86 km away
41. 2.210km ESE of Willits, CASat, Dec 18, 12:02 PM PST · 1750 days ago · 7 km deep · 64 km away · felt by 1
42. 1.88km NW of The Geysers, CATue, Dec 21, 12:52 AM PST · 1748 days ago · 2 km deep · 81 km away
43. 1.51km NNW of The Geysers, CATue, Dec 21, 1:41 AM PST · 1748 days ago · 1 km deep · 87 km away
44. 1.59km S of Boonville, CATue, Dec 21, 1:46 PM PST · 1747 days ago · 0 km deep · 32 km away · felt by 1
45. 2.14km E of Redwood Valley, CAWed, Dec 22, 11:04 AM PST · 1746 days ago · 3 km deep · 62 km away · felt by 1
46. 1.74km E of Redwood Valley, CAWed, Dec 22, 11:08 AM PST · 1746 days ago · 4 km deep · 62 km away
47. 1.720km ESE of Navarro Head, CAWed, Dec 22, 12:41 PM PST · 1746 days ago · 3 km deep · 23 km away
48. 1.61km NW of The Geysers, CAWed, Dec 22, 3:54 PM PST · 1746 days ago · 2 km deep · 86 km away
49. 1.71km N of The Geysers, CAWed, Dec 22, 4:08 PM PST · 1746 days ago · 3 km deep · 87 km away
50. 2.513km SE of Talmage, CAWed, Dec 22, 4:24 PM PST · 1746 days ago · 3 km deep · 59 km away · felt by 8
51. 1.86km NNW of The Geysers, CAThu, Dec 23, 8:40 AM PST · 1746 days ago · 1 km deep · 84 km away
52. 2.55km NNW of The Geysers, CAThu, Dec 23, 9:50 AM PST · 1745 days ago · 1 km deep · 84 km away
53. 1.54km SE of Clearlake Oaks, CAThu, Dec 23, 6:50 PM PST · 1745 days ago · 5 km deep · 96 km away
54. 1.89km NNW of Redwood Valley, CAThu, Dec 23, 7:01 PM PST · 1745 days ago · 7 km deep · 63 km away
55. 1.64km WNW of The Geysers, CAThu, Dec 23, 8:18 PM PST · 1745 days ago · 3 km deep · 83 km away
56. 2.010km NNW of Redwood Valley, CAThu, Dec 23, 10:12 PM PST · 1745 days ago · 7 km deep · 63 km away · felt by 1
57. 1.67km NE of Willits, CAThu, Dec 23, 10:23 PM PST · 1745 days ago · 7 km deep · 68 km away
58. 2.19km NNW of Lake Pillsbury, CAThu, Dec 23, 11:27 PM PST · 1745 days ago · 7 km deep · 90 km away
59. 2.23km SW of Anderson Springs, CASat, Dec 25, 2:25 AM PST · 1744 days ago · 1 km deep · 92 km away
60. 1.56km WNW of Cobb, CASat, Dec 25, 9:06 AM PST · 1744 days ago · 2 km deep · 84 km away

The first 60 of 155.

Before

1. 1.816km W of Ukiah, CASat, Dec 4, 7:26 AM PST · 1765 days ago · 4 km deep · 39 km away
2. 1.88km NW of The Geysers, CAFri, Dec 3, 4:02 AM PST · 1766 days ago · 2 km deep · 81 km away
3. 2.41km NNW of The Geysers, CATue, Nov 30, 9:16 PM PST · 1768 days ago · 2 km deep · 87 km away
4. 1.53km SSW of Cobb, CATue, Nov 30, 7:30 PM PST · 1768 days ago · 1 km deep · 89 km away
5. 2.53km ENE of The Geysers, CATue, Nov 30, 7:30 PM PST · 1768 days ago · 2 km deep · 90 km away · felt by 6
6. 1.76km NW of The Geysers, CATue, Nov 30, 6:38 PM PST · 1768 days ago · 3 km deep · 83 km away
7. 1.68km NW of The Geysers, CATue, Nov 30, 9:17 AM PST · 1769 days ago · 2 km deep · 81 km away
8. 1.612km N of Brooktrails, CAMon, Nov 29, 3:15 PM PST · 1769 days ago · 7 km deep · 74 km away
9. 1.64km SSE of Redwood Valley, CAMon, Nov 29, 2:44 PM PST · 1769 days ago · 6 km deep · 58 km away
10. 2.110km N of Lake Pillsbury, CAMon, Nov 29, 1:07 PM PST · 1769 days ago · 6 km deep · 93 km away
11. 1.616km ESE of Boonville, CAMon, Nov 29, 12:59 PM PST · 1769 days ago · 6 km deep · 47 km away
12. 1.912km W of Lake Pillsbury, CASun, Nov 28, 7:22 PM PST · 1770 days ago · -1 km deep · 77 km away
13. 1.59km WNW of Cobb, CASun, Nov 28, 11:27 AM PST · 1770 days ago · 1 km deep · 81 km away
14. 1.69km W of Cobb, CASun, Nov 28, 11:26 AM PST · 1770 days ago · 1 km deep · 81 km away
15. 1.89km W of Cobb, CASun, Nov 28, 11:25 AM PST · 1770 days ago · 1 km deep · 81 km away
16. 1.96km NNE of Windsor, CASat, Nov 27, 7:28 AM PST · 1772 days ago · 7 km deep · 90 km away
17. 1.88km NW of The Geysers, CASat, Nov 27, 2:05 AM PST · 1772 days ago · 2 km deep · 81 km away
18. 1.612km NW of Upper Lake, CAFri, Nov 26, 9:34 PM PST · 1772 days ago · 1 km deep · 72 km away
19. 2.27km NW of The Geysers, CAFri, Nov 26, 8:04 PM PST · 1772 days ago · 3 km deep · 82 km away
20. 2.17km NW of The Geysers, CAFri, Nov 26, 8:01 PM PST · 1772 days ago · 3 km deep · 82 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc73659706. Read Sun, Oct 4, 2026, 4:59 AM UTC.