California earthquakes

M2.1 earthquake 6 km WSW of Hydesville, California

A magnitude 2.1 earthquake struck 6 km WSW of Hydesville, California on Sat, Nov 21, 1987, 9:31 AM PST (17:31 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M3.8 25 km SSW of Ferndale, California. This one was a foreshock.

Hydesville 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
2.1 (md), micro
Local time
UTC
1987-11-21 17:31:55 UTC
Depth
7.7 km (4.8 mi), shallow
Epicenter
40.536° N, 124.175° 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 0.8 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
226°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.825 km SSW of Ferndale, California · 14184 days ago · 21 km deep · 27 km away
  2. 1.710 km SW of Ferndale, California · 14183 days ago · 22 km deep · 16 km away
  3. 1.826 km SSW of Ferndale, California · 14183 days ago · 16 km deep · 28 km away
  4. 2.479 km WSW of Ferndale, California · 14181 days ago · 5 km deep · 85 km away
  5. 1.922 km SSW of Ferndale, California · 14181 days ago · 19 km deep · 24 km away
  6. 2.290 km W of Ferndale, California · 14180 days ago · 5 km deep · 98 km away
  7. 1.92 km NW of Ferndale, California · 14179 days ago · 4 km deep · 12 km away
  8. 3.233 km SSW of Ferndale, California · 14177 days ago · 11 km deep · 34 km away
  9. 2.34 km N of Ferndale, California · 14177 days ago · 10 km deep · 12 km away
  10. 2.05 km SSE of Ferndale, California · 14177 days ago · 14 km deep · 6 km away
  11. 1.929 km NNW of Willow Creek, California · 14176 days ago · -1 km deep · 83 km away
  12. 2.25 km NNW of Ferndale, California · 14176 days ago · 1 km deep · 13 km away
  13. 2.63 km NNW of Hydesville, California · 14176 days ago · 4 km deep · 6 km away
  14. 3.223 km SSW of Ferndale, California · 14176 days ago · 19 km deep · 24 km away
  15. 1.98 km W of Indianola, California · 14175 days ago · 4 km deep · 22 km away
  16. 2.24 km NNE of Ruth, California · 14171 days ago · 4 km deep · 79 km away
  17. 2.658 km WSW of Ferndale, California · 14171 days ago · 4 km deep · 64 km away
  18. 2.815 km SE of Indianola, California · 14170 days ago · 22 km deep · 25 km away
  19. 3.828 km SSW of Ferndale, California · 14170 days ago · 15 km deep · 29 km away
  20. 3.329 km SSW of Ferndale, California · 14169 days ago · 18 km deep · 31 km away
  21. 2.68 km WSW of Ferndale, California · 14169 days ago · 18 km deep · 16 km away
  22. 2.234 km SW of Scotia, California · 14169 days ago · 18 km deep · 35 km away
  23. 2.728 km SW of Ferndale, California · 14166 days ago · 3 km deep · 31 km away
  24. 2.518 km SSW of Scotia, California · 14159 days ago · 22 km deep · 22 km away
  25. 2.57 km NE of Miranda, California · 14150 days ago · 8 km deep · 44 km away
  26. 2.411 km SSW of Willow Creek, California · 14143 days ago · 4 km deep · 55 km away
  27. 2.639 km WSW of Ferndale, California · 14140 days ago · 3 km deep · 46 km away
  28. 1.97 km ESE of Scotia, California · 14139 days ago · 7 km deep · 15 km away
  29. 2.931 km SW of Scotia, California · 14137 days ago · 5 km deep · 32 km away
  30. 3.884 km WSW of Ferndale, California · 14131 days ago · 1 km deep · 90 km away
  31. 2.02 km NE of Rio Dell, California · 14131 days ago · 21 km deep · 8 km away
  32. 1.627 km SSW of Ferndale, California · 14129 days ago · 4 km deep · 28 km away
  33. 2.921 km SSW of Ferndale, California · 14127 days ago · 21 km deep · 22 km away
  34. 1.835 km SSW of Ferndale, California · 14126 days ago · 22 km deep · 37 km away
  35. 2.435 km SSW of Ferndale, California · 14126 days ago · 5 km deep · 35 km away

Before

  1. 3.231 km SW of Ferndale, California · 14188 days ago · 4 km deep · 34 km away
  2. 2.551 km WSW of Ferndale, California · 14192 days ago · 23 km deep · 57 km away
  3. 3.836 km WNW of Samoa, California · 14193 days ago · 14 km deep · 54 km away
  4. 3.436 km W of Ferndale, California · 14194 days ago · 2 km deep · 44 km away
  5. 2.987 km W of Ferndale, California · 14196 days ago · 18 km deep · 94 km away
  6. 2.212 km S of Ferndale, California · 14197 days ago · 0 km deep · 10 km away
  7. 2.523 km NNE of Redcrest, California · 14202 days ago · 4 km deep · 31 km away
  8. 2.628 km SW of Ferndale, California · 14203 days ago · 22 km deep · 32 km away
  9. 2.717 km NE of Phillipsville, California · 14207 days ago · 4 km deep · 48 km away
  10. 2.3Northern California · 14211 days ago · 4 km deep · 40 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc108771. Read Tue, Sep 22, 2026, 12:12 PM UTC.