California earthquakes

M1.8 earthquake 8km NE of Windsor, CA

A magnitude 1.8 earthquake struck 8km NE of Windsor, CA on Tue, Feb 23, 2021, 5:38 PM PST (01:38 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.0 21km SSW of Willits, CA. This one was a foreshock.

Windsor 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-02-24 01:38:05 UTC
Depth
5.9 km (3.7 mi), shallow
Epicenter
38.606° N, 122.761° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
59°
Stations used
53

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 192 in the 60 days after this one and 102 in the 30 days before it.

After

  1. 2.013km E of Angwin, CA · 2048 days ago · 7 km deep · 41 km away
  2. 2.113km E of Angwin, CA · 2048 days ago · 8 km deep · 40 km away · felt by 1
  3. 2.14km NW of The Geysers, CA · 2048 days ago · 0 km deep · 22 km away
  4. 1.94km NW of The Geysers, CA · 2048 days ago · 0 km deep · 22 km away
  5. 1.52km NW of The Geysers, CA · 2047 days ago · 1 km deep · 20 km away
  6. 3.87km NW of The Geysers, CA · 2046 days ago · 3 km deep · 24 km away · felt by 46
  7. 2.27km WNW of The Geysers, CA · 2046 days ago · 2 km deep · 24 km away
  8. 2.36km WNW of The Geysers, CA · 2046 days ago · 3 km deep · 23 km away
  9. 1.67km NW of The Geysers, CA · 2046 days ago · 2 km deep · 24 km away
  10. 1.65km NW of The Geysers, CA · 2045 days ago · 3 km deep · 23 km away
  11. 2.213km WNW of Calistoga, CA · 2045 days ago · 6 km deep · 6 km away · felt by 1
  12. 1.88km NW of The Geysers, CA · 2045 days ago · 2 km deep · 25 km away
  13. 2.61km NW of The Geysers, CA · 2044 days ago · 2 km deep · 20 km away · felt by 5
  14. 1.81km NE of The Geysers, CA · 2043 days ago · -1 km deep · 19 km away
  15. 2.01km ENE of The Geysers, CA · 2043 days ago · 0 km deep · 20 km away
  16. 2.11km ENE of The Geysers, CA · 2043 days ago · -1 km deep · 19 km away
  17. 2.35km WNW of Cobb, CA · 2042 days ago · 2 km deep · 26 km away · felt by 6
  18. 1.65km WNW of Cobb, CA · 2042 days ago · 2 km deep · 25 km away
  19. 1.85km ESE of St. Helena, CA · 2042 days ago · 12 km deep · 33 km away · felt by 1
  20. 2.210km N of Cloverdale, CA · 2042 days ago · -1 km deep · 38 km away
  21. 2.52km SE of The Geysers, CA · 2042 days ago · 1 km deep · 18 km away
  22. 2.93km SE of The Geysers, CA · 2042 days ago · 1 km deep · 17 km away · felt by 7
  23. 1.77km SW of Boonville, CA · 2041 days ago · 0 km deep · 70 km away
  24. 1.96km ESE of St. Helena, CA · 2041 days ago · 7 km deep · 34 km away
  25. 2.08km W of Cobb, CA · 2040 days ago · 2 km deep · 26 km away · felt by 1
  26. 1.63km SSW of Cobb, CA · 2040 days ago · 2 km deep · 22 km away
  27. 3.16km WSW of St. Helena, CA · 2040 days ago · 11 km deep · 24 km away · felt by 234
  28. 1.85km SSW of Redwood Valley, CA · 2039 days ago · 0 km deep · 80 km away
  29. 1.75km NW of The Geysers, CA · 2039 days ago · 3 km deep · 23 km away
  30. 2.013km W of Lake Pillsbury, CA · 2039 days ago · -1 km deep · 95 km away
  31. 1.93km ESE of Berkeley, CA · 2038 days ago · 7 km deep · 94 km away · felt by 5
  32. 1.64km NNW of The Geysers, CA · 2038 days ago · 1 km deep · 22 km away · felt by 3
  33. 2.74km NNW of The Geysers, CA · 2038 days ago · 1 km deep · 22 km away · felt by 2
  34. 2.34km NW of The Geysers, CA · 2038 days ago · 2 km deep · 22 km away
  35. 1.75km WNW of Angwin, CA · 2038 days ago · 4 km deep · 22 km away
  36. 1.52km E of The Geysers, CA · 2037 days ago · 1 km deep · 19 km away
  37. 2.611km ESE of Willits, CA · 2037 days ago · 7 km deep · 94 km away · felt by 19
  38. 1.520km SSW of Willits, CA · 2036 days ago · 6 km deep · 93 km away
  39. 1.66km NW of The Geysers, CA · 2036 days ago · 3 km deep · 24 km away
  40. 1.810km ESE of Willits, CA · 2036 days ago · 5 km deep · 94 km away
  41. 1.53km W of Cobb, CA · 2036 days ago · 2 km deep · 24 km away
  42. 2.06km NW of The Geysers, CA · 2034 days ago · 3 km deep · 24 km away
  43. 1.72km NW of The Geysers, CA · 2034 days ago · 2 km deep · 20 km away
  44. 1.76km NW of The Geysers, CA · 2034 days ago · 3 km deep · 24 km away
  45. 1.65km WNW of Cobb, CA · 2033 days ago · 2 km deep · 25 km away
  46. 2.13km W of Cobb, CA · 2032 days ago · 2 km deep · 24 km away
  47. 1.86km NW of The Geysers, CA · 2032 days ago · 3 km deep · 24 km away
  48. 2.018km NE of Upper Lake, CA · 2031 days ago · 2 km deep · 74 km away
  49. 1.818km SE of Lake Pillsbury, CA · 2031 days ago · 7 km deep · 78 km away
  50. 1.910km NNW of Redwood Valley, CA · 2031 days ago · 6 km deep · 92 km away
  51. 1.88km NW of The Geysers, CA · 2031 days ago · 2 km deep · 26 km away
  52. 1.810km ESE of Willits, CA · 2030 days ago · 6 km deep · 94 km away
  53. 1.76km SSW of Yountville, CA · 2029 days ago · 7 km deep · 44 km away · felt by 1
  54. 1.62km E of Vallejo, CA · 2029 days ago · 7 km deep · 73 km away
  55. 1.910km ESE of Willits, CA · 2027 days ago · 6 km deep · 94 km away
  56. 2.710km WNW of American Canyon, CA · 2026 days ago · 9 km deep · 56 km away · felt by 20
  57. 1.613km NW of The Geysers, CA · 2025 days ago · 3 km deep · 28 km away
  58. 2.27km NW of The Geysers, CA · 2025 days ago · 3 km deep · 25 km away
  59. 2.713km W of Lake Pillsbury, CA · 2025 days ago · 1 km deep · 96 km away · felt by 6
  60. 1.911km N of Healdsburg, CA · 2024 days ago · 6 km deep · 14 km away

The first 60 of 192.

Before

  1. 1.78km NW of The Geysers, CA · 2049 days ago · 2 km deep · 25 km away
  2. 1.81km WNW of The Geysers, CA · 2049 days ago · 1 km deep · 19 km away
  3. 1.83km SE of The Geysers, CA · 2050 days ago · 2 km deep · 17 km away
  4. 1.65km N of Lake Pillsbury, CA · 2050 days ago · 9 km deep · 96 km away
  5. 1.63km SW of Cobb, CA · 2050 days ago · 1 km deep · 22 km away
  6. 2.28km WNW of Cobb, CA · 2050 days ago · 2 km deep · 26 km away
  7. 1.82km ESE of Berkeley, CA · 2051 days ago · 5 km deep · 93 km away · felt by 2
  8. 1.78km NE of Windsor, CA · 2051 days ago · 4 km deep · 0 km away
  9. 1.68km NW of The Geysers, CA · 2051 days ago · 2 km deep · 26 km away
  10. 1.62km N of The Geysers, CA · 2051 days ago · 1 km deep · 21 km away
  11. 1.71km NW of The Geysers, CA · 2051 days ago · 2 km deep · 20 km away
  12. 1.54km W of Cobb, CA · 2053 days ago · 2 km deep · 24 km away
  13. 1.86km WNW of Cobb, CA · 2053 days ago · 2 km deep · 25 km away
  14. 1.55km E of Clearlake Oaks, CA · 2054 days ago · -1 km deep · 48 km away
  15. 1.68km WNW of The Geysers, CA · 2054 days ago · 2 km deep · 24 km away
  16. 2.210km ESE of Hidden Valley Lake, CA · 2054 days ago · 8 km deep · 33 km away
  17. 2.15km WNW of Cobb, CA · 2055 days ago · 2 km deep · 25 km away
  18. 1.79km WNW of The Geysers, CA · 2055 days ago · 2 km deep · 25 km away
  19. 1.95km NW of The Geysers, CA · 2055 days ago · 3 km deep · 22 km away
  20. 1.78km NW of The Geysers, CA · 2056 days ago · 2 km deep · 25 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73526956. Read Sun, Oct 4, 2026, 4:33 AM UTC.