California earthquakes

M1.8 earthquake 18 km NNE of Upper Lake, California

A magnitude 1.8 earthquake struck 18 km NNE of Upper Lake, California on Wed, Apr 21, 1982, 8:05 AM PST (16:05 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.3 5 km W of Cobb, California. This one was a foreshock.

Upper Lake 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), micro
Local time
UTC
1982-04-21 16:05:42 UTC
Depth
4.1 km (2.6 mi), shallow
Epicenter
39.303° N, 122.793° 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 0.9 km horizontally, 2.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
194°, poorly surrounded by stations
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 117 in the 60 days after this one and 69 in the 30 days before it.

After

  1. 2.35 km W of Cobb, California · 16225 days ago · 1 km deep · 54 km away
  2. 1.97 km WSW of Cobb, California · 16223 days ago · -1 km deep · 56 km away
  3. 1.510 km SSW of Kelseyville, California · 16223 days ago · 2 km deep · 46 km away
  4. 2.48 km NNE of Comptche, California · 16222 days ago · 5 km deep · 65 km away
  5. 1.621 km ENE of Potter Valley, California · 16222 days ago · 15 km deep · 15 km away
  6. 2.022 km ENE of Potter Valley, California · 16222 days ago · 13 km deep · 15 km away
  7. 1.522 km NE of Potter Valley, California · 16221 days ago · 12 km deep · 24 km away
  8. 1.5Northern California · 16220 days ago · 2 km deep · 33 km away
  9. 2.34 km WSW of Cobb, California · 16220 days ago · 1 km deep · 56 km away
  10. 1.92 km SSW of Cobb, California · 16220 days ago · -1 km deep · 56 km away
  11. 2.616 km ESE of Hidden Valley Lake, California · 16220 days ago · 4 km deep · 71 km away
  12. 1.924 km W of Stonyford, California · 16219 days ago · 8 km deep · 9 km away
  13. 1.74 km NNE of Clearlake, California · 16219 days ago · 0 km deep · 38 km away
  14. 1.96 km NNE of Clearlake, California · 16219 days ago · 0 km deep · 37 km away
  15. 1.57 km W of Cobb, California · 16217 days ago · 4 km deep · 54 km away
  16. 1.66 km WSW of Calistoga, California · 16217 days ago · 4 km deep · 83 km away
  17. 2.124 km NE of Potter Valley, California · 16216 days ago · 9 km deep · 25 km away
  18. 1.98 km NNW of Redwood Valley, California · 16215 days ago · 7 km deep · 38 km away
  19. 2.26 km W of Cobb, California · 16215 days ago · 4 km deep · 54 km away
  20. 1.80 km S of Saint Helena, California · 16214 days ago · 8 km deep · 94 km away
  21. 2.412 km SE of Hidden Valley Lake, California · 16214 days ago · 1 km deep · 70 km away
  22. 1.612 km SE of Hidden Valley Lake, California · 16214 days ago · -1 km deep · 70 km away
  23. 2.06 km WSW of Cobb, California · 16213 days ago · 1 km deep · 56 km away
  24. 2.06 km W of Cobb, California · 16212 days ago · 3 km deep · 54 km away
  25. 1.77 km N of Brooktrails, CA · 16212 days ago · 8 km deep · 55 km away
  26. 2.410 km N of Princeton, California · 16211 days ago · 21 km deep · 70 km away
  27. 1.69 km ESE of Willits, California · 16211 days ago · 7 km deep · 40 km away
  28. 1.57 km W of Cobb, California · 16210 days ago · 2 km deep · 55 km away
  29. 1.610 km ESE of Willits, California · 16210 days ago · 8 km deep · 39 km away
  30. 1.714 km NNW of Laytonville, California · 16209 days ago · 4 km deep · 86 km away
  31. 1.820 km NNE of Upper Lake, California · 16206 days ago · 12 km deep · 6 km away
  32. 2.47 km WSW of Cobb, California · 16205 days ago · 0 km deep · 55 km away
  33. 2.17 km WSW of Cobb, California · 16204 days ago · 1 km deep · 56 km away
  34. 1.823 km ENE of Potter Valley, California · 16204 days ago · 9 km deep · 12 km away
  35. 1.57 km W of Cobb, California · 16204 days ago · 0 km deep · 55 km away
  36. 2.87 km W of Cobb, California · 16203 days ago · 1 km deep · 54 km away
  37. 1.97 km E of Hidden Valley Lake, California · 16201 days ago · 8 km deep · 62 km away
  38. 2.411 km SE of Paskenta, California · 16201 days ago · 26 km deep · 64 km away
  39. 1.86 km NE of Willits, California · 16201 days ago · 7 km deep · 46 km away
  40. 1.59 km WSW of Cobb, California · 16200 days ago · 2 km deep · 56 km away
  41. 1.66 km ENE of Covelo, California · 16200 days ago · 8 km deep · 67 km away
  42. 2.78 km NNW of Paskenta, California · 16197 days ago · 2 km deep · 74 km away
  43. 2.18 km N of Geyserville, California · 16197 days ago · 5 km deep · 59 km away
  44. 2.08 km ESE of Willits, California · 16197 days ago · 4 km deep · 42 km away
  45. 2.06 km W of Cobb, California · 16196 days ago · 3 km deep · 54 km away
  46. 1.67 km WSW of Cobb, California · 16196 days ago · 0 km deep · 55 km away
  47. 1.77 km WSW of Cobb, California · 16196 days ago · 0 km deep · 55 km away
  48. 1.55 km ENE of Larkfield-Wikiup, California · 16196 days ago · 5 km deep · 85 km away
  49. 1.97 km NE of Covelo, California · 16195 days ago · 9 km deep · 68 km away
  50. 1.74 km SSW of Cobb, California · 16194 days ago · -1 km deep · 57 km away
  51. 1.78 km ENE of Covelo, California · 16194 days ago · -1 km deep · 66 km away
  52. 1.815 km NNE of Brooktrails, California · 16193 days ago · 13 km deep · 55 km away
  53. 1.67 km N of Brooktrails, California · 16193 days ago · 7 km deep · 56 km away
  54. 1.67 km WSW of Cobb, California · 16192 days ago · -1 km deep · 55 km away
  55. 2.87 km W of Cobb, California · 16192 days ago · 0 km deep · 54 km away
  56. 2.00 km NNE of Calpella, California · 16191 days ago · 7 km deep · 36 km away
  57. 1.77 km ENE of Covelo, California · 16191 days ago · 7 km deep · 66 km away
  58. 1.730 km WNW of Paskenta, California · 16191 days ago · 6 km deep · 72 km away
  59. 2.57 km WSW of Cobb, California · 16190 days ago · 4 km deep · 56 km away
  60. 1.88 km W of Cobb, California · 16189 days ago · 0 km deep · 54 km away

The first 60 of 117.

Before

  1. 1.96 km SSW of Calistoga, California · 16228 days ago · 5 km deep · 88 km away
  2. 2.19 km WSW of Cobb, California · 16228 days ago · 2 km deep · 56 km away
  3. 2.06 km W of Cobb, California · 16229 days ago · 4 km deep · 54 km away
  4. 1.74 km SE of Clear Lake Riviera, California · 16229 days ago · 3 km deep · 43 km away
  5. 1.77 km WSW of Cobb, California · 16230 days ago · 1 km deep · 56 km away
  6. 2.69 km WSW of Cobb, California · 16231 days ago · 2 km deep · 56 km away
  7. 2.39 km SSE of Kelseyville, California · 16231 days ago · -1 km deep · 45 km away
  8. 2.07 km WSW of Cobb, California · 16231 days ago · 0 km deep · 56 km away
  9. 2.114 km N of Potter Valley, California · 16232 days ago · 7 km deep · 32 km away
  10. 1.714 km NNE of Angwin, California · 16232 days ago · 3 km deep · 77 km away
  11. 1.88 km WSW of Cobb, California · 16232 days ago · 2 km deep · 56 km away
  12. 1.63 km ESE of Larkfield-Wikiup, California · 16233 days ago · 7 km deep · 90 km away
  13. 2.72 km SE of Larkfield-Wikiup, California · 16234 days ago · 5 km deep · 90 km away
  14. 2.73 km SE of Larkfield-Wikiup, California · 16234 days ago · 6 km deep · 90 km away
  15. 2.83 km SE of Larkfield-Wikiup, California · 16234 days ago · 6 km deep · 90 km away
  16. 1.96 km W of Cobb, California · 16234 days ago · 5 km deep · 54 km away
  17. 2.33 km SE of Larkfield-Wikiup, California · 16234 days ago · 5 km deep · 90 km away
  18. 2.13 km SE of Calpella, California · 16234 days ago · 3 km deep · 35 km away
  19. 2.98 km ESE of Talmage, California · 16235 days ago · 9 km deep · 33 km away
  20. 1.99 km NE of Cloverdale, California · 16235 days ago · 11 km deep · 50 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1073852. Read Tue, Sep 22, 2026, 8:28 PM UTC.