California earthquakes

M1.9 earthquake 13 km NNE of Angwin, California

A magnitude 1.9 earthquake struck 13 km NNE of Angwin, California on Wed, Feb 23, 1977, 2:32 PM PST (22:32 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M3.3 3 km W of Moskowite Corner, California. This one was a foreshock.

Angwin 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
1.9 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1977-02-23 22:32:47 UTC
Depth
9.3 km (5.8 mi), shallow
Epicenter
38.685° N, 122.394° 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 0.5 km horizontally, 2.1 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
115°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 70 in the 60 days after this one and 28 in the 30 days before it.

After

  1. 2.46 km W of Cobb, California · 18116 days ago · 4 km deep · 38 km away
  2. 1.52 km ESE of Boonville, California · 18115 days ago · 8 km deep · 89 km away
  3. 1.62 km ESE of Boonville, California · 18115 days ago · 6 km deep · 89 km away
  4. 2.66 km E of Larkfield-Wikiup, California · 18115 days ago · 6 km deep · 31 km away
  5. 2.22 km ESE of Boonville, California · 18115 days ago · 7 km deep · 89 km away
  6. 2.02 km ESE of Boonville, California · 18115 days ago · 6 km deep · 89 km away
  7. 2.46 km W of Cobb, California · 18114 days ago · 0 km deep · 38 km away
  8. 2.426 km ENE of Potter Valley, California · 18113 days ago · 5 km deep · 94 km away
  9. 2.512 km E of Geyserville, California · 18112 days ago · 8 km deep · 32 km away
  10. 3.00 km SW of Alamo, California · 18110 days ago · 10 km deep · 98 km away
  11. 1.61 km WSW of Alamo, California · 18110 days ago · 9 km deep · 98 km away
  12. 2.622 km ENE of Potter Valley, California · 18110 days ago · 8 km deep · 94 km away
  13. 1.67 km W of Cobb, California · 18109 days ago · 3 km deep · 39 km away
  14. 2.18 km W of Cobb, California · 18108 days ago · -1 km deep · 40 km away
  15. 1.61 km SW of Geyserville, California · 18108 days ago · 5 km deep · 45 km away
  16. 1.61 km SW of Geyserville, California · 18108 days ago · 2 km deep · 46 km away
  17. 1.62 km SW of Geyserville, California · 18107 days ago · 3 km deep · 46 km away
  18. 2.711 km ESE of Hidden Valley Lake, California · 18107 days ago · 6 km deep · 9 km away
  19. 1.54 km WSW of Cobb, California · 18107 days ago · 1 km deep · 35 km away
  20. 2.07 km W of Cobb, California · 18106 days ago · 4 km deep · 39 km away
  21. 2.43 km NNE of Santa Rosa, California · 18105 days ago · 8 km deep · 35 km away
  22. 2.13 km ESE of Cloverdale, California · 18105 days ago · 6 km deep · 52 km away
  23. 1.63 km ESE of Cloverdale, California · 18103 days ago · 6 km deep · 52 km away
  24. 2.38 km WSW of Cobb, California · 18102 days ago · 0 km deep · 39 km away
  25. 1.7Northern California · 18102 days ago · 1 km deep · 39 km away
  26. 1.62 km ESE of Boonville, California · 18101 days ago · 5 km deep · 89 km away
  27. 1.72 km SE of North Lakeport, California · 18100 days ago · 1 km deep · 60 km away
  28. 2.118 km NE of Nice, California · 18099 days ago · 8 km deep · 67 km away
  29. 2.911 km N of Pittsburg, California · 18096 days ago · 19 km deep · 75 km away
  30. 1.74 km WSW of Cobb, California · 18096 days ago · 1 km deep · 35 km away
  31. 1.74 km WSW of Cobb, California · 18096 days ago · 1 km deep · 35 km away
  32. 1.84 km WSW of Cobb, California · 18096 days ago · 1 km deep · 35 km away
  33. 1.98 km W of Saint Helena, California · 18094 days ago · 7 km deep · 26 km away
  34. 1.96 km W of Cobb, California · 18094 days ago · 3 km deep · 38 km away
  35. 2.721 km NNE of Upper Lake, California · 18093 days ago · 10 km deep · 79 km away
  36. 2.40 km WSW of Larkfield-Wikiup, California · 18093 days ago · 2 km deep · 37 km away
  37. 1.96 km W of Cobb, California · 18091 days ago · 2 km deep · 38 km away
  38. 1.86 km W of Cobb, California · 18091 days ago · 3 km deep · 38 km away
  39. 1.75 km WSW of Cobb, California · 18090 days ago · 4 km deep · 36 km away
  40. 2.18 km WSW of Cobb, California · 18089 days ago · 4 km deep · 39 km away
  41. 2.06 km S of Calistoga, California · 18089 days ago · 5 km deep · 25 km away
  42. 2.421 km NNE of Upper Lake, California · 18088 days ago · 8 km deep · 82 km away
  43. 2.46 km W of Cobb, California · 18088 days ago · 3 km deep · 38 km away
  44. 2.26 km S of Moskowite Corner, California · 18088 days ago · 12 km deep · 38 km away
  45. 1.68 km WSW of Cobb, California · 18087 days ago · 3 km deep · 39 km away
  46. 2.22 km ENE of Calpella, California · 18087 days ago · 5 km deep · 92 km away
  47. 3.33 km W of Moskowite Corner, California · 18085 days ago · 7 km deep · 30 km away
  48. 2.95 km NNE of Penngrove, California · 18085 days ago · 7 km deep · 43 km away
  49. 2.32 km ESE of Boonville, California · 18084 days ago · 8 km deep · 89 km away
  50. 2.42 km ESE of Princeton, California · 18084 days ago · 22 km deep · 86 km away
  51. 1.54 km WSW of Cobb, California · 18083 days ago · 1 km deep · 35 km away
  52. 1.77 km W of Cobb, California · 18083 days ago · 1 km deep · 40 km away
  53. 2.13 km ENE of Windsor, California · 18083 days ago · 5 km deep · 36 km away
  54. 1.87 km ESE of Geyserville, California · 18083 days ago · 6 km deep · 38 km away
  55. 2.58 km W of Cobb, California · 18082 days ago · 0 km deep · 40 km away
  56. 1.86 km W of Cobb, California · 18078 days ago · 3 km deep · 39 km away
  57. 2.38 km NNE of Pittsburg, California · 18075 days ago · 20 km deep · 81 km away
  58. 1.66 km W of Cobb, California · 18075 days ago · 3 km deep · 39 km away
  59. 1.97 km WSW of Kenwood, California · 18073 days ago · 9 km deep · 38 km away
  60. 2.07 km WSW of Kenwood, California · 18073 days ago · 10 km deep · 38 km away

The first 60 of 70.

Before

  1. 2.17 km WSW of Cobb, California · 18117 days ago · 4 km deep · 38 km away
  2. 1.64 km WSW of Cobb, California · 18118 days ago · 1 km deep · 35 km away
  3. 2.16 km W of Cobb, California · 18122 days ago · 3 km deep · 39 km away
  4. 1.77 km ENE of Larkfield-Wikiup, California · 18122 days ago · 6 km deep · 30 km away
  5. 1.67 km W of Cobb, California · 18124 days ago · 3 km deep · 39 km away
  6. 2.87 km SSE of Dunnigan, California · 18125 days ago · 10 km deep · 42 km away
  7. 2.2Northern California · 18125 days ago · 3 km deep · 39 km away
  8. 2.87 km SSE of Dunnigan, California · 18125 days ago · 9 km deep · 43 km away
  9. 1.76 km ENE of Vallejo, California · 18125 days ago · 2 km deep · 64 km away
  10. 1.99 km WSW of Cobb, California · 18125 days ago · 0 km deep · 40 km away
  11. 2.24 km ESE of Santa Rosa, California · 18126 days ago · 10 km deep · 37 km away
  12. 1.88 km W of Cobb, California · 18127 days ago · 0 km deep · 39 km away
  13. 2.39 km ESE of Black Point-Green Point, California · 18127 days ago · 12 km deep · 66 km away
  14. 3.07 km WSW of Cobb, California · 18129 days ago · 2 km deep · 38 km away
  15. 2.113 km NNE of Angwin, California · 18130 days ago · 12 km deep · 1 km away
  16. 2.44 km WSW of Cobb, California · 18130 days ago · 1 km deep · 35 km away
  17. 2.217 km NE of Nice, California · 18130 days ago · 9 km deep · 67 km away
  18. 2.27 km W of Cobb, California · 18130 days ago · 3 km deep · 39 km away
  19. 1.95 km SW of Clearlake, California · 18131 days ago · 2 km deep · 36 km away
  20. 2.03 km WSW of Cobb, California · 18138 days ago · 2 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1034100. Read Thu, Oct 1, 2026, 5:17 AM UTC.