California earthquakes

M2.1 earthquake 7 km NNW of Richvale, California

A magnitude 2.1 earthquake struck 7 km NNW of Richvale, California on Wed, Apr 17, 1985, 1:34 PM PST (21:34 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.2 21 km WSW of Williams, 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
2.1 (md), micro
Local time
UTC
1985-04-17 21:34:52 UTC
Depth
4.7 km (2.9 mi), shallow
Epicenter
39.555° N, 121.783° 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 2.5 km horizontally, 8.3 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
273°, poorly surrounded by stations
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 73 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 2.221 km WSW of Williams, California · 15132 days ago · 0 km deep · 73 km away
  2. 3.710 km WSW of Meridian, California · 15132 days ago · 18 km deep · 53 km away
  3. 2.29 km WSW of Meridian, California · 15132 days ago · 12 km deep · 52 km away
  4. 2.88 km NNE of Arbuckle, California · 15130 days ago · 3 km deep · 56 km away
  5. 2.322 km WSW of Williams, California · 15130 days ago · 3 km deep · 74 km away
  6. 2.58 km WSW of Meridian, California · 15129 days ago · 12 km deep · 52 km away
  7. 2.06 km WNW of Guinda, California · 15121 days ago · 3 km deep · 89 km away
  8. 2.57 km SW of Meridian, California · 15120 days ago · 10 km deep · 53 km away
  9. 2.321 km WSW of Williams, California · 15119 days ago · 0 km deep · 73 km away
  10. 1.710 km E of Red Bluff, California · 15117 days ago · 3 km deep · 75 km away
  11. 2.231 km WSW of Paskenta, California · 15116 days ago · 9 km deep · 97 km away
  12. 1.912 km ENE of Bend, California · 15115 days ago · 7 km deep · 88 km away
  13. 2.31 km SW of Lake Almanor West, California · 15110 days ago · 3 km deep · 89 km away
  14. 1.619 km E of Potter Valley, California · 15107 days ago · 5 km deep · 98 km away
  15. 1.78 km WSW of Red Bluff, California · 15106 days ago · 17 km deep · 80 km away
  16. 2.613 km ESE of Mineral, California · 15106 days ago · 8 km deep · 89 km away
  17. 1.617 km NE of Upper Lake, California · 15106 days ago · 4 km deep · 90 km away
  18. 1.820 km ENE of Clearlake, California · 15104 days ago · 6 km deep · 79 km away
  19. 1.612 km WSW of Williams, CA · 15103 days ago · 7 km deep · 65 km away
  20. 2.88 km WSW of Meridian, California · 15102 days ago · 0 km deep · 54 km away
  21. 1.514 km S of Hamilton City, California · 15102 days ago · 5 km deep · 19 km away
  22. 2.35 km W of Meridian, California · 15100 days ago · 9 km deep · 48 km away
  23. 2.66 km SSW of Colusa, California · 15100 days ago · 21 km deep · 49 km away
  24. 3.28 km SSW of Colusa, California · 15100 days ago · 20 km deep · 51 km away
  25. 2.710 km WSW of Meridian, California · 15100 days ago · 8 km deep · 54 km away
  26. 2.56 km SSW of Colusa, California · 15100 days ago · 12 km deep · 50 km away
  27. 3.37 km SSW of Colusa, California · 15100 days ago · 21 km deep · 50 km away
  28. 2.26 km S of Colusa, California · 15100 days ago · 13 km deep · 49 km away
  29. 2.0Northern California · 15099 days ago · 6 km deep · 51 km away
  30. 2.46 km WSW of Meridian, California · 15099 days ago · 7 km deep · 51 km away
  31. 3.09 km W of Meridian, California · 15099 days ago · 23 km deep · 51 km away
  32. 2.00 km NE of Butte Meadows, California · 15099 days ago · 3 km deep · 62 km away
  33. 2.210 km ESE of Williams, California · 15099 days ago · 14 km deep · 54 km away
  34. 1.57 km E of Williams, California · 15099 days ago · 3 km deep · 51 km away
  35. 2.03 km NE of East Quincy, California · 15096 days ago · 4 km deep · 90 km away
  36. 2.47 km SW of Colusa, California · 15095 days ago · 25 km deep · 50 km away
  37. 2.38 km SSW of Colusa, California · 15095 days ago · 28 km deep · 51 km away
  38. 1.78 km WSW of Lake Almanor West, California · 15093 days ago · 11 km deep · 84 km away
  39. 2.013 km NNW of Belden, California · 15093 days ago · 3 km deep · 74 km away
  40. 2.64 km W of Meridian, California · 15093 days ago · 6 km deep · 49 km away
  41. 1.612 km ENE of Upper Lake, California · 15091 days ago · 9 km deep · 94 km away
  42. 1.73 km WNW of Chester, California · 15090 days ago · -1 km deep · 96 km away
  43. 2.19 km WSW of Meridian, California · 15090 days ago · 5 km deep · 54 km away
  44. 2.510 km ESE of Williams, California · 15090 days ago · 18 km deep · 54 km away
  45. 2.16 km E of Williams, California · 15089 days ago · 22 km deep · 52 km away
  46. 2.810 km NNE of Arbuckle, California · 15089 days ago · 9 km deep · 54 km away
  47. 3.69 km ESE of Williams, California · 15089 days ago · 13 km deep · 54 km away
  48. 2.39 km SSW of Colusa, California · 15089 days ago · 16 km deep · 52 km away
  49. 1.86 km SSW of Colusa, California · 15089 days ago · 5 km deep · 49 km away
  50. 3.5Northern California · 15089 days ago · 23 km deep · 52 km away
  51. 1.84 km SSW of Dunnigan, California · 15089 days ago · 5 km deep · 81 km away
  52. 2.28 km NNE of Arbuckle, California · 15089 days ago · 4 km deep · 56 km away
  53. 1.96 km W of Meridian, California · 15089 days ago · 5 km deep · 49 km away
  54. 1.67 km SSW of Colusa, California · 15088 days ago · 5 km deep · 50 km away
  55. 1.77 km NE of Clearlake, California · 15088 days ago · 1 km deep · 91 km away
  56. 2.624 km WNW of Paskenta, California · 15087 days ago · -1 km deep · 99 km away
  57. 2.07 km WNW of Arbuckle, California · 15086 days ago · 4 km deep · 65 km away
  58. 2.44 km S of Oroville East, California · 15086 days ago · 2 km deep · 28 km away
  59. 1.722 km NE of Potter Valley, California · 15085 days ago · 7 km deep · 98 km away
  60. 2.38 km E of Williams, California · 15084 days ago · 17 km deep · 51 km away

The first 60 of 73.

Before

  1. 2.010 km E of Red Bluff, California · 15134 days ago · 4 km deep · 74 km away
  2. 2.312 km ESE of Bend, California · 15134 days ago · 17 km deep · 79 km away
  3. 2.913 km NE of Proberta, California · 15134 days ago · -1 km deep · 74 km away
  4. 1.812 km E of Red Bluff, California · 15135 days ago · 1 km deep · 74 km away
  5. 1.918 km NE of Upper Lake, California · 15135 days ago · 7 km deep · 90 km away
  6. 2.810 km E of Red Bluff, California · 15135 days ago · 10 km deep · 74 km away
  7. 2.47 km WNW of Guinda, California · 15135 days ago · 1 km deep · 89 km away
  8. 2.58 km WNW of Guinda, California · 15136 days ago · 2 km deep · 89 km away
  9. 1.614 km NE of Proberta, California · 15138 days ago · 0 km deep · 72 km away
  10. 2.111 km E of Red Bluff, California · 15139 days ago · 14 km deep · 76 km away
  11. 1.80 km NNW of Prattville, California · 15139 days ago · 3 km deep · 90 km away
  12. 2.516 km NNE of Elk Creek, California · 15140 days ago · 0 km deep · 61 km away
  13. 1.820 km WSW of Williams, California · 15143 days ago · 4 km deep · 72 km away
  14. 2.27 km NNE of Elk Creek, California · 15145 days ago · 12 km deep · 63 km away
  15. 1.85 km WNW of Dobbins, California · 15145 days ago · 19 km deep · 48 km away
  16. 2.120 km WSW of Williams, California · 15146 days ago · 2 km deep · 72 km away
  17. 2.219 km WSW of Williams, California · 15146 days ago · 4 km deep · 71 km away
  18. 2.04 km ENE of Tobin, California · 15148 days ago · 12 km deep · 63 km away
  19. 2.417 km WSW of Williams, California · 15148 days ago · 5 km deep · 68 km away
  20. 2.520 km WSW of Williams, California · 15149 days ago · 5 km deep · 71 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc47399. Read Tue, Sep 22, 2026, 4:04 PM UTC.