California earthquakes

M1.7 earthquake 20 km NNE of Upper Lake, California

A magnitude 1.7 earthquake struck 20 km NNE of Upper Lake, California on Mon, Sep 28, 1981, 12:46 PM PDT (19:46 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.5 15 km N of Brooktrails, 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
1.7 (md), micro
Local time
UTC
1981-09-28 19:46:16 UTC
Depth
6.6 km (4.1 mi), shallow
Epicenter
39.340° N, 122.827° 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 0.2 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
84°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 49 in the 30 days before it.

After

  1. 1.66 km WSW of Cobb, California · 16437 days ago · 2 km deep · 59 km away
  2. 1.86 km NE of Hopland, California · 16436 days ago · 1 km deep · 41 km away
  3. 2.77 km NE of Healdsburg, California · 16436 days ago · 5 km deep · 75 km away
  4. 1.77 km NE of Healdsburg, California · 16435 days ago · 5 km deep · 75 km away
  5. 1.77 km W of Cobb, California · 16435 days ago · 0 km deep · 58 km away
  6. 2.029 km WSW of Paskenta, California · 16435 days ago · 2 km deep · 47 km away
  7. 1.68 km W of Cobb, California · 16434 days ago · 0 km deep · 59 km away
  8. 1.67 km WSW of Cobb, California · 16433 days ago · 4 km deep · 61 km away
  9. 1.89 km WSW of Cobb, California · 16433 days ago · 1 km deep · 60 km away
  10. 1.98 km W of Cobb, California · 16432 days ago · -1 km deep · 59 km away
  11. 1.78 km NE of Hopland, California · 16432 days ago · 5 km deep · 40 km away
  12. 2.87 km WSW of Cobb, California · 16432 days ago · 2 km deep · 59 km away
  13. 1.97 km WSW of Cobb, California · 16432 days ago · 1 km deep · 60 km away
  14. 2.111 km ESE of Boonville, California · 16432 days ago · 6 km deep · 55 km away
  15. 1.66 km WSW of Cobb, California · 16431 days ago · 0 km deep · 60 km away
  16. 1.97 km SSE of Laytonville, California · 16431 days ago · 5 km deep · 62 km away
  17. 2.35 km WSW of Cobb, California · 16431 days ago · 1 km deep · 59 km away
  18. 1.82 km NNW of Ukiah, California · 16430 days ago · 0 km deep · 38 km away
  19. 2.17 km W of Cobb, California · 16429 days ago · 0 km deep · 56 km away
  20. 2.06 km W of Cobb, California · 16429 days ago · 4 km deep · 58 km away
  21. 1.65 km SW of Cobb, California · 16428 days ago · 0 km deep · 62 km away
  22. 2.15 km SW of Cobb, California · 16428 days ago · 0 km deep · 62 km away
  23. 1.65 km WSW of Hopland, California · 16428 days ago · 5 km deep · 53 km away
  24. 1.66 km W of Cobb, California · 16428 days ago · 2 km deep · 59 km away
  25. 1.65 km WSW of Cobb, California · 16427 days ago · 0 km deep · 61 km away
  26. 2.27 km WSW of Cobb, California · 16427 days ago · 0 km deep · 60 km away
  27. 1.66 km W of Cobb, California · 16427 days ago · 1 km deep · 58 km away
  28. 1.85 km W of Cobb, California · 16426 days ago · 0 km deep · 57 km away
  29. 3.15 km W of Cobb, California · 16426 days ago · 1 km deep · 57 km away
  30. 2.46 km W of Cobb, California · 16426 days ago · 1 km deep · 57 km away
  31. 3.111 km NE of Hidden Valley Lake, California · 16426 days ago · 11 km deep · 61 km away
  32. 2.09 km ENE of Hidden Valley Lake, California · 16426 days ago · 8 km deep · 63 km away
  33. 1.79 km W of Cobb, California · 16426 days ago · 1 km deep · 59 km away
  34. 1.65 km WSW of Cobb, California · 16425 days ago · 0 km deep · 59 km away
  35. 1.89 km ENE of Hidden Valley Lake, California · 16425 days ago · 7 km deep · 63 km away
  36. 2.84 km E of Geyserville, California · 16424 days ago · 5 km deep · 70 km away
  37. 2.08 km W of Cobb, California · 16424 days ago · 0 km deep · 59 km away
  38. 1.69 km WSW of Cobb, California · 16424 days ago · 3 km deep · 60 km away
  39. 1.84 km E of Geyserville, California · 16424 days ago · 4 km deep · 71 km away
  40. 3.1Northern California · 16424 days ago · 1 km deep · 59 km away
  41. 1.618 km NE of Upper Lake, California · 16424 days ago · 5 km deep · 5 km away
  42. 1.717 km N of Moskowite Corner, California · 16424 days ago · 8 km deep · 98 km away
  43. 2.214 km S of Hamilton City, California · 16423 days ago · 23 km deep · 75 km away
  44. 1.94 km WSW of Cobb, California · 16423 days ago · 1 km deep · 60 km away
  45. 1.59 km WSW of Cobb, California · 16423 days ago · 1 km deep · 60 km away
  46. 1.58 km NNE of Cloverdale, California · 16423 days ago · 3 km deep · 53 km away
  47. 1.67 km W of Cobb, California · 16422 days ago · 1 km deep · 59 km away
  48. 1.74 km E of Geyserville, California · 16421 days ago · 5 km deep · 71 km away
  49. 1.69 km WSW of Cobb, California · 16421 days ago · 1 km deep · 60 km away
  50. 1.62 km E of Larkfield-Wikiup, California · 16421 days ago · 8 km deep · 93 km away
  51. 1.84 km E of Geyserville, California · 16421 days ago · 3 km deep · 71 km away
  52. 1.55 km SSW of Cobb, California · 16420 days ago · -1 km deep · 63 km away
  53. 1.89 km WSW of Cobb, California · 16418 days ago · 1 km deep · 60 km away
  54. 1.57 km WSW of Cobb, California · 16418 days ago · 2 km deep · 60 km away
  55. 2.35 km SW of Cobb, California · 16418 days ago · 0 km deep · 62 km away
  56. 1.68 km ENE of Brooktrails, California · 16414 days ago · 8 km deep · 44 km away
  57. 3.515 km N of Brooktrails, California · 16413 days ago · 9 km deep · 53 km away
  58. 2.29 km WSW of Cobb, California · 16412 days ago · 0 km deep · 60 km away
  59. 2.129 km WSW of Paskenta, California · 16410 days ago · 11 km deep · 52 km away
  60. 1.77 km WSW of Cobb, California · 16408 days ago · 1 km deep · 60 km away

The first 60 of 124.

Before

  1. 1.62 km E of Calpella, California · 16438 days ago · 5 km deep · 32 km away
  2. 2.121 km ENE of Potter Valley, California · 16439 days ago · 0 km deep · 9 km away
  3. 1.54 km WSW of Cobb, California · 16439 days ago · 1 km deep · 60 km away
  4. 2.14 km WSW of Cobb, California · 16439 days ago · 1 km deep · 60 km away
  5. 1.88 km E of Hopland, California · 16440 days ago · 7 km deep · 46 km away
  6. 1.65 km SW of Cobb, California · 16440 days ago · 0 km deep · 61 km away
  7. 2.67 km WSW of Cobb, California · 16441 days ago · 1 km deep · 59 km away
  8. 1.810 km E of Hidden Valley Lake, California · 16441 days ago · 7 km deep · 69 km away
  9. 1.77 km W of Cobb, California · 16441 days ago · 2 km deep · 59 km away
  10. 2.08 km W of Cobb, California · 16441 days ago · 0 km deep · 58 km away
  11. 1.98 km W of Cobb, California · 16441 days ago · 0 km deep · 58 km away
  12. 2.07 km W of Cobb, California · 16442 days ago · 2 km deep · 58 km away
  13. 2.87 km NE of Healdsburg, California · 16442 days ago · 6 km deep · 75 km away
  14. 2.04 km NE of Princeton, California · 16443 days ago · 24 km deep · 75 km away
  15. 1.714 km NNW of Moskowite Corner, California · 16443 days ago · 0 km deep · 99 km away
  16. 2.16 km W of Cobb, California · 16443 days ago · 4 km deep · 58 km away
  17. 2.10 km E of Kelseyville, California · 16444 days ago · 0 km deep · 40 km away
  18. 2.03 km SSW of Geyserville, California · 16444 days ago · 3 km deep · 74 km away
  19. 2.37 km WSW of Cobb, California · 16445 days ago · 4 km deep · 60 km away
  20. 2.03 km WNW of Lower Lake, California · 16447 days ago · 1 km deep · 50 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1068018. Read Tue, Sep 29, 2026, 7:21 PM UTC.