California earthquakes

M1.8 earthquake 5 km NW of Round Valley, California

A magnitude 1.8 earthquake struck 5 km NW of Round Valley, California on Mon, Sep 23, 1985, 5:21 PM PDT (00:21 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.3 12 km SW of Aspen Springs, California. This one was a foreshock.

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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
1985-09-24 00:21:20 UTC
Depth
9.7 km (6.0 mi), shallow
Epicenter
37.456° N, 118.625° 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, 0.3 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
55°
Stations used
30

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 74 in the 30 days before it.

After

  1. 1.86 km NW of Mammoth Lakes, California · 14972 days ago · -1 km deep · 44 km away
  2. 1.82 km WNW of Round Valley, California · 14972 days ago · 9 km deep · 3 km away
  3. 2.312 km SW of Aspen Springs, California · 14972 days ago · 7 km deep · 16 km away
  4. 1.716 km E of Mono City, California · 14971 days ago · 6 km deep · 73 km away
  5. 3.012 km W of Aspen Springs, California · 14971 days ago · 3 km deep · 23 km away
  6. 1.95 km WSW of Mammoth Lakes, California · 14970 days ago · -2 km deep · 41 km away
  7. 1.65 km SSE of Swall Meadows, California · 14970 days ago · 7 km deep · 1 km away
  8. 2.013 km ESE of Yosemite Valley, California · 14969 days ago · 5 km deep · 76 km away
  9. 1.91 km ENE of Round Valley, California · 14969 days ago · 9 km deep · 6 km away
  10. 1.64 km W of Mammoth Lakes, California · 14966 days ago · -2 km deep · 41 km away
  11. 2.14 km WNW of Aspen Springs, California · 14966 days ago · 5 km deep · 17 km away
  12. 1.54 km WNW of Aspen Springs, California · 14966 days ago · 5 km deep · 17 km away
  13. 1.68 km ESE of Mammoth Lakes, California · 14963 days ago · 5 km deep · 29 km away
  14. 2.13 km N of Round Valley, California · 14962 days ago · 12 km deep · 3 km away
  15. 2.14 km SSE of Swall Meadows, California · 14962 days ago · 9 km deep · 2 km away
  16. 3.111 km SW of Aspen Springs, California · 14961 days ago · 7 km deep · 16 km away
  17. 1.611 km SW of Aspen Springs, California · 14961 days ago · 5 km deep · 16 km away
  18. 2.115 km WSW of Aspen Springs, California · 14960 days ago · 5 km deep · 22 km away
  19. 2.014 km WSW of Aspen Springs, California · 14960 days ago · 6 km deep · 22 km away
  20. 2.011 km SW of Aspen Springs, California · 14959 days ago · 5 km deep · 16 km away
  21. 2.115 km NW of Squaw Valley, California · 14957 days ago · 2 km deep · 94 km away
  22. 2.18 km SE of Mammoth Lakes, California · 14957 days ago · 4 km deep · 29 km away
  23. 1.98 km SE of Mammoth Lakes, California · 14957 days ago · 4 km deep · 29 km away
  24. 1.914 km SW of Aspen Springs, California · 14957 days ago · 8 km deep · 19 km away
  25. 2.418 km S of Big Pine, California · 14957 days ago · 14 km deep · 59 km away
  26. 2.23 km NW of Swall Meadows, California · 14956 days ago · 7 km deep · 9 km away
  27. 1.73 km NW of Swall Meadows, California · 14956 days ago · 8 km deep · 9 km away
  28. 1.83 km NW of Swall Meadows, California · 14956 days ago · 7 km deep · 9 km away
  29. 1.86 km SE of Mammoth Lakes, California · 14956 days ago · 3 km deep · 31 km away
  30. 1.723 km S of Mammoth Lakes, California · 14956 days ago · 5 km deep · 33 km away
  31. 2.47 km WSW of Aspen Springs, California · 14956 days ago · 2 km deep · 17 km away
  32. 1.721 km SE of Yosemite Valley, California · 14955 days ago · 5 km deep · 72 km away
  33. 1.919 km ESE of Yosemite Valley, California · 14955 days ago · 22 km deep · 70 km away
  34. 1.56 km SE of Mammoth Lakes, California · 14955 days ago · 3 km deep · 31 km away
  35. 1.512 km SSW of Round Valley, California · 14955 days ago · 11 km deep · 16 km away
  36. 2.26 km ENE of Mesa, California · 14954 days ago · 5 km deep · 14 km away
  37. 2.7California-Nevada border region · 14954 days ago · 4 km deep · 29 km away
  38. 2.16 km W of Swall Meadows, California · 14954 days ago · 2 km deep · 9 km away
  39. 1.88 km SE of Mammoth Lakes, California · 14954 days ago · 4 km deep · 29 km away
  40. 2.08 km ESE of Mammoth Lakes, California · 14954 days ago · 4 km deep · 29 km away
  41. 2.38 km SE of Mammoth Lakes, California · 14953 days ago · 4 km deep · 29 km away
  42. 2.814 km WSW of Aspen Springs, California · 14953 days ago · 5 km deep · 22 km away
  43. 1.65 km WSW of Mammoth Lakes, California · 14950 days ago · 1 km deep · 40 km away
  44. 1.615 km ENE of Mono City, California · 14949 days ago · 4 km deep · 75 km away
  45. 1.55 km WSW of Mammoth Lakes, California · 14949 days ago · 2 km deep · 41 km away
  46. 1.97 km SE of Mammoth Lakes, California · 14948 days ago · 3 km deep · 30 km away
  47. 1.51 km WNW of Swall Meadows, California · 14948 days ago · 8 km deep · 7 km away
  48. 1.68 km SE of Mammoth Lakes, California · 14947 days ago · 2 km deep · 29 km away
  49. 1.64 km SSE of Swall Meadows, California · 14947 days ago · 9 km deep · 1 km away
  50. 1.88 km WSW of Aspen Springs, California · 14947 days ago · 11 km deep · 17 km away
  51. 1.89 km W of Aspen Springs, California · 14947 days ago · 2 km deep · 21 km away
  52. 2.112 km SE of Mammoth Lakes, California · 14945 days ago · 2 km deep · 25 km away
  53. 1.62 km WNW of Round Valley, California · 14943 days ago · 7 km deep · 3 km away
  54. 2.24 km SSE of Swall Meadows, California · 14943 days ago · 10 km deep · 2 km away
  55. 1.63 km NNW of Round Valley, California · 14943 days ago · 10 km deep · 2 km away
  56. 1.58 km SE of Mammoth Lakes, California · 14941 days ago · 4 km deep · 29 km away
  57. 2.212 km WSW of Aspen Springs, California · 14939 days ago · 4 km deep · 20 km away
  58. 2.118 km S of Big Pine, California · 14938 days ago · 10 km deep · 57 km away
  59. 2.120 km ESE of Yosemite Valley, California · 14938 days ago · 22 km deep · 69 km away
  60. 1.922 km SW of Wilkerson, California · 14936 days ago · 7 km deep · 37 km away

The first 60 of 124.

Before

  1. 3.65 km S of Swall Meadows, California · 14975 days ago · 4 km deep · 2 km away
  2. 1.65 km N of Round Valley, California · 14975 days ago · 4 km deep · 3 km away
  3. 1.97 km WSW of June Lake, California · 14975 days ago · 3 km deep · 57 km away
  4. 2.62 km SSE of Round Valley, California · 14975 days ago · 7 km deep · 7 km away
  5. 1.811 km WNW of Aspen Springs, California · 14975 days ago · 6 km deep · 24 km away
  6. 2.84 km SSE of Swall Meadows, California · 14976 days ago · 9 km deep · 2 km away
  7. 1.815 km ENE of Mono City, California · 14976 days ago · 2 km deep · 76 km away
  8. 1.816 km E of Mono City, California · 14976 days ago · 8 km deep · 73 km away
  9. 2.3California-Nevada border region · 14976 days ago · 7 km deep · 73 km away
  10. 1.61 km ENE of Round Valley, California · 14977 days ago · 10 km deep · 6 km away
  11. 3.61 km ENE of Round Valley, California · 14977 days ago · 10 km deep · 6 km away
  12. 2.05 km W of Mammoth Lakes, California · 14977 days ago · -1 km deep · 42 km away
  13. 1.511 km W of Round Valley, California · 14978 days ago · 14 km deep · 9 km away
  14. 2.911 km W of Round Valley, California · 14978 days ago · 14 km deep · 9 km away
  15. 3.56 km SW of Swall Meadows, California · 14980 days ago · 4 km deep · 5 km away
  16. 1.523 km WSW of Mammoth Lakes, California · 14980 days ago · 2 km deep · 54 km away
  17. 1.510 km WNW of Aspen Springs, California · 14980 days ago · 9 km deep · 23 km away
  18. 1.83 km WSW of Round Valley, California · 14981 days ago · 11 km deep · 5 km away
  19. 2.05 km WSW of Mammoth Lakes, California · 14981 days ago · -1 km deep · 41 km away
  20. 1.94 km S of Swall Meadows, California · 14982 days ago · 3 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc55693. Read Tue, Sep 22, 2026, 8:42 PM UTC.