California earthquakes

M1.5 earthquake 9km SE of Sea Ranch, CA

A magnitude 1.5 earthquake struck 9km SE of Sea Ranch, CA on Wed, Aug 4, 2021, 2:21 AM PDT (09:21 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.8 4km ENE of Talmage, CA. This one was a foreshock.

Sea Ranch forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-08-04 09:21:17 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
38.648° N, 123.389° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.6 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
216°, poorly surrounded by stations
Stations used
11

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 134 in the 60 days after this one and 103 in the 30 days before it.

After

  1. 1.63km WSW of Cobb, CA · 1887 days ago · 2 km deep · 58 km away
  2. 2.37km ESE of Willits, CA · 1886 days ago · 6 km deep · 84 km away
  3. 2.27km ESE of Willits, CA · 1886 days ago · 5 km deep · 83 km away
  4. 1.715km SE of Lake Pillsbury, CA · 1886 days ago · 2 km deep · 87 km away
  5. 1.95km WNW of Cobb, CA · 1886 days ago · 2 km deep · 57 km away
  6. 1.64km E of Cloverdale, CA · 1885 days ago · 0 km deep · 40 km away · felt by 3
  7. 1.68km NW of The Geysers, CA · 1882 days ago · 2 km deep · 54 km away
  8. 2.212km ESE of Hidden Valley Lake, CA · 1881 days ago · 10 km deep · 84 km away
  9. 1.88km NW of The Geysers, CA · 1881 days ago · 2 km deep · 54 km away
  10. 1.88km NW of The Geysers, CA · 1881 days ago · 2 km deep · 54 km away
  11. 1.76km E of Willits, CA · 1880 days ago · 6 km deep · 86 km away
  12. 1.84km NNW of The Geysers, CA · 1880 days ago · 2 km deep · 56 km away
  13. 1.73km E of The Geysers, CA · 1880 days ago · 1 km deep · 59 km away
  14. 1.612km ESE of Hidden Valley Lake, CA · 1880 days ago · 8 km deep · 84 km away
  15. 2.32km WNW of Tomales, CA · 1879 days ago · 4 km deep · 60 km away · felt by 17
  16. 1.67km NW of The Geysers, CA · 1878 days ago · 2 km deep · 54 km away · felt by 2
  17. 1.819km NE of Upper Lake, CA · 1878 days ago · 8 km deep · 89 km away · felt by 1
  18. 1.66km NW of The Geysers, CA · 1877 days ago · 3 km deep · 53 km away
  19. 1.58km SW of Calistoga, CA · 1877 days ago · 9 km deep · 66 km away
  20. 2.46km N of Cobb, CA · 1876 days ago · 3 km deep · 63 km away · felt by 10
  21. 1.78km NW of The Geysers, CA · 1876 days ago · 2 km deep · 54 km away
  22. 2.413km NE of Yountville, CA · 1875 days ago · 5 km deep · 99 km away · felt by 1
  23. 1.513km E of Angwin, CA · 1875 days ago · 3 km deep · 95 km away
  24. 2.512km ESE of Angwin, CA · 1875 days ago · 0 km deep · 94 km away · felt by 5
  25. 1.75km NW of The Geysers, CA · 1874 days ago · 3 km deep · 55 km away
  26. 1.88km NNW of Redwood Valley, CA · 1874 days ago · 1 km deep · 77 km away
  27. 1.62km NNE of The Geysers, CA · 1873 days ago · 1 km deep · 58 km away
  28. 1.82km SSW of Bodega Bay, CA · 1872 days ago · 11 km deep · 47 km away
  29. 1.82km SSW of Bodega Bay, CA · 1872 days ago · 10 km deep · 47 km away
  30. 2.12km SSW of Bodega Bay, CA · 1872 days ago · 10 km deep · 47 km away
  31. 1.74km SSE of The Geysers, CA · 1871 days ago · 1 km deep · 57 km away · felt by 1
  32. 2.41km ESE of The Geysers, CA · 1871 days ago · 2 km deep · 58 km away
  33. 1.911km SW of The Geysers, CA · 1871 days ago · 6 km deep · 47 km away
  34. 1.511km SW of The Geysers, CA · 1871 days ago · 6 km deep · 47 km away
  35. 1.86km WNW of The Geysers, CA · 1871 days ago · 3 km deep · 53 km away
  36. 2.28km WNW of Cobb, CA · 1868 days ago · 2 km deep · 55 km away
  37. 2.07km W of Calistoga, CA · 1867 days ago · 8 km deep · 64 km away · felt by 8
  38. 1.98km WNW of Point Arena, CA · 1867 days ago · 6 km deep · 47 km away
  39. 1.77km WSW of St. Helena, CA · 1866 days ago · 8 km deep · 75 km away
  40. 2.43km W of Anderson Springs, CA · 1865 days ago · 2 km deep · 59 km away
  41. 2.44km S of Talmage, CA · 1865 days ago · 8 km deep · 53 km away · felt by 7
  42. 2.510km NW of The Geysers, CA · 1865 days ago · 2 km deep · 53 km away
  43. 1.65km W of Cobb, CA · 1864 days ago · 1 km deep · 56 km away
  44. 2.53km ESE of Larkfield-Wikiup, CA · 1864 days ago · 7 km deep · 60 km away · felt by 122
  45. 1.57km WSW of St. Helena, CA · 1864 days ago · 9 km deep · 76 km away
  46. 2.14km S of Larkfield-Wikiup, CA · 1864 days ago · 7 km deep · 58 km away · felt by 5
  47. 1.91km WNW of The Geysers, CA · 1864 days ago · 1 km deep · 56 km away
  48. 1.66km NW of The Geysers, CA · 1863 days ago · 3 km deep · 53 km away
  49. 1.59km WNW of Cobb, CA · 1862 days ago · 2 km deep · 54 km away
  50. 1.97km NW of The Geysers, CA · 1862 days ago · 2 km deep · 54 km away
  51. 1.69km E of Willits, CA · 1862 days ago · 8 km deep · 85 km away
  52. 2.73km WNW of Cobb, CA · 1862 days ago · 0 km deep · 58 km away · felt by 6
  53. 2.23km WNW of Cobb, CA · 1862 days ago · 0 km deep · 58 km away
  54. 1.93km WNW of Cobb, CA · 1862 days ago · 0 km deep · 59 km away
  55. 1.63km WNW of Cobb, CA · 1861 days ago · 0 km deep · 58 km away
  56. 1.91km NNE of The Geysers, CA · 1861 days ago · 2 km deep · 57 km away
  57. 1.95km NW of The Geysers, CA · 1861 days ago · 2 km deep · 54 km away
  58. 2.16km NW of The Geysers, CA · 1861 days ago · 3 km deep · 55 km away
  59. 1.73km ENE of The Geysers, CA · 1860 days ago · 2 km deep · 60 km away
  60. 1.810km NNE of Windsor, CA · 1860 days ago · 7 km deep · 55 km away

The first 60 of 134.

Before

  1. 1.710km NNE of Angwin, CA · 1887 days ago · 7 km deep · 86 km away
  2. 2.04km E of Cloverdale, CA · 1887 days ago · 0 km deep · 40 km away · felt by 1
  3. 1.68km NNW of Lake Pillsbury, CA · 1887 days ago · 10 km deep · 98 km away
  4. 1.610km NNW of Redwood Valley, CA · 1888 days ago · 6 km deep · 79 km away
  5. 1.810km E of Clearlake, CA · 1888 days ago · 3 km deep · 84 km away
  6. 2.15km SSE of Cloverdale, CA · 1889 days ago · 3 km deep · 36 km away · felt by 10
  7. 1.82km ESE of Redwood Valley, CA · 1889 days ago · 7 km deep · 70 km away
  8. 1.55km NW of The Geysers, CA · 1890 days ago · 2 km deep · 55 km away
  9. 2.43km W of Anderson Springs, CA · 1890 days ago · 1 km deep · 60 km away
  10. 1.72km W of Anderson Springs, CA · 1890 days ago · 2 km deep · 60 km away · felt by 1
  11. 2.111km NE of Healdsburg, CA · 1890 days ago · 6 km deep · 54 km away · felt by 2
  12. 1.610km ENE of Hidden Valley Lake, CA · 1891 days ago · 9 km deep · 84 km away
  13. 2.16km W of Cobb, CA · 1891 days ago · 2 km deep · 55 km away
  14. 3.25km NNW of The Geysers, CA · 1891 days ago · 3 km deep · 55 km away · felt by 34
  15. 2.46km NW of The Geysers, CA · 1892 days ago · 2 km deep · 55 km away
  16. 1.97km ESE of Lake Pillsbury, CA · 1892 days ago · 4 km deep · 92 km away
  17. 2.26km NW of The Geysers, CA · 1892 days ago · 3 km deep · 55 km away
  18. 1.76km NW of The Geysers, CA · 1892 days ago · 3 km deep · 54 km away
  19. 1.97km NW of The Geysers, CA · 1892 days ago · 3 km deep · 54 km away
  20. 2.57km NW of The Geysers, CA · 1892 days ago · 3 km deep · 54 km away · felt by 4

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73605571. Read Sun, Oct 4, 2026, 8:58 AM UTC.