California earthquakes

M1.6 earthquake 17 km N of Alderpoint, California

A magnitude 1.6 earthquake struck 17 km N of Alderpoint, California on Wed, Feb 21, 1990, 4:33 PM PST (00:33 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M3.9 near the coast of Northern 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-02-22 00:33:33 UTC
Depth
18.4 km (11.4 mi), shallow
Epicenter
40.331° N, 123.644° 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 0.7 km horizontally, 0.8 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
139°
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: 43 in the 60 days after this one and 35 in the 30 days before it.

After

  1. 2.7near the coast of Northern California · 13374 days ago · 5 km deep · 100 km away
  2. 1.84 km E of Laytonville, California · 13371 days ago · 2 km deep · 74 km away
  3. 1.721 km WSW of Weott, California · 13370 days ago · 11 km deep · 44 km away
  4. 2.627 km SSW of Ferndale, California · 13368 days ago · 14 km deep · 67 km away
  5. 1.85 km E of Laytonville, California · 13367 days ago · 4 km deep · 74 km away
  6. 2.230 km SW of Ferndale, California · 13367 days ago · 21 km deep · 72 km away
  7. 1.95 km E of Laytonville, California · 13366 days ago · 5 km deep · 73 km away
  8. 2.837 km SW of Ferndale, California · 13362 days ago · 20 km deep · 76 km away
  9. 1.910 km SE of Laytonville, California · 13362 days ago · 8 km deep · 83 km away
  10. 1.65 km E of Laytonville, California · 13362 days ago · 4 km deep · 74 km away
  11. 1.84 km NNW of Laytonville, California · 13360 days ago · 5 km deep · 69 km away
  12. 2.127 km WSW of Ferndale, California · 13360 days ago · 25 km deep · 79 km away
  13. 2.332 km SW of Ferndale, California · 13359 days ago · 24 km deep · 80 km away
  14. 1.911 km E of Burnt Ranch, California · 13355 days ago · 3 km deep · 58 km away
  15. 3.318 km WNW of Fields Landing, California · 13354 days ago · 21 km deep · 83 km away
  16. 1.925 km ESE of Orick, California · 13352 days ago · 4 km deep · 99 km away
  17. 3.038 km SW of Ferndale, California · 13349 days ago · 20 km deep · 78 km away
  18. 3.9near the coast of Northern California · 13347 days ago · 17 km deep · 67 km away
  19. 1.732 km SW of Scotia, California · 13346 days ago · 23 km deep · 63 km away
  20. 2.635 km SW of Ferndale, California · 13344 days ago · 15 km deep · 76 km away
  21. 3.741 km SW of Ferndale, California · 13344 days ago · 10 km deep · 84 km away
  22. 2.136 km SW of Ferndale, California · 13341 days ago · 20 km deep · 74 km away
  23. 1.717 km W of Laytonville, California · 13341 days ago · 1 km deep · 73 km away
  24. 2.023 km WNW of Ferndale, California · 13341 days ago · 24 km deep · 83 km away
  25. 3.240 km SW of Ferndale, California · 13340 days ago · 6 km deep · 81 km away
  26. 1.831 km SSW of Ferndale, California · 13340 days ago · 3 km deep · 66 km away
  27. 3.66 km SW of Scotia, California · 13339 days ago · 22 km deep · 44 km away
  28. 2.2near the coast of Northern California · 13339 days ago · 22 km deep · 44 km away
  29. 2.54 km S of Scotia, California · 13339 days ago · 16 km deep · 41 km away
  30. 1.83 km NE of Redway, California · 13337 days ago · 21 km deep · 25 km away
  31. 1.83 km WSW of Fortuna, California · 13336 days ago · 22 km deep · 55 km away
  32. 1.88 km S of Leggett, California · 13335 days ago · 3 km deep · 61 km away
  33. 3.06 km WNW of Manila, California · 13335 days ago · 16 km deep · 78 km away
  34. 1.812 km SSW of Scotia, California · 13334 days ago · 29 km deep · 42 km away
  35. 2.229 km SW of Ferndale, California · 13332 days ago · 17 km deep · 75 km away
  36. 1.913 km SSW of Ferndale, California · 13329 days ago · 15 km deep · 62 km away
  37. 3.427 km SSW of Ferndale, California · 13327 days ago · 17 km deep · 65 km away
  38. 2.323 km WNW of Rancho Tehama Reserve, California · 13321 days ago · -1 km deep · 88 km away
  39. 2.530 km WNW of Rancho Tehama Reserve, California · 13320 days ago · 8 km deep · 81 km away
  40. 2.424 km SSW of Scotia, California · 13319 days ago · 9 km deep · 49 km away
  41. 1.68 km W of Weott, California · 13317 days ago · 4 km deep · 32 km away
  42. 2.117 km ENE of Burnt Ranch, California · 13317 days ago · 3 km deep · 68 km away
  43. 2.729 km SW of Scotia, California · 13316 days ago · 5 km deep · 62 km away

Before

  1. 1.87 km ENE of Brooktrails, California · 13377 days ago · 6 km deep · 99 km away
  2. 2.028 km WSW of Leggett, California · 13377 days ago · 2 km deep · 72 km away
  3. 2.011 km W of Willow Creek, California · 13378 days ago · 17 km deep · 68 km away
  4. 2.8near the coast of Northern California · 13380 days ago · 3 km deep · 66 km away
  5. 2.26 km E of Covelo, California · 13382 days ago · 6 km deep · 71 km away
  6. 2.22 km E of Indianola, California · 13382 days ago · 7 km deep · 64 km away
  7. 1.929 km SW of Ferndale, California · 13384 days ago · 16 km deep · 71 km away
  8. 1.513 km N of Brooktrails, California · 13385 days ago · 5 km deep · 88 km away
  9. 2.119 km WSW of Weott, California · 13385 days ago · 8 km deep · 42 km away
  10. 1.61 km E of Loleta, California · 13387 days ago · 8 km deep · 59 km away
  11. 2.60 km SSE of Loleta, California · 13387 days ago · 11 km deep · 59 km away
  12. 2.223 km WNW of Ferndale, California · 13387 days ago · 11 km deep · 82 km away
  13. 2.936 km SW of Ferndale, California · 13387 days ago · 21 km deep · 74 km away
  14. 3.2near the coast of Northern California · 13387 days ago · 21 km deep · 73 km away
  15. 2.017 km SW of Scotia, California · 13388 days ago · 29 km deep · 51 km away
  16. 2.930 km SSW of Ferndale, California · 13389 days ago · 27 km deep · 65 km away
  17. 2.417 km SSW of Ferndale, California · 13390 days ago · 16 km deep · 61 km away
  18. 3.627 km SE of Ruth, California · 13392 days ago · 39 km deep · 53 km away
  19. 2.29 km NE of Weott, California · 13393 days ago · 22 km deep · 18 km away
  20. 2.015 km ESE of Mad River, California · 13393 days ago · 29 km deep · 28 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc152854. Read Mon, Oct 5, 2026, 3:28 AM UTC.