California earthquakes

M2.1 earthquake 12 km NE of Philo, California

A magnitude 2.1 earthquake struck 12 km NE of Philo, California on Sat, Oct 3, 1987, 1:19 PM PDT (20:19 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M3.2 5 km SW of Cobb, 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
1987-10-03 20:19:33 UTC
Depth
-0.6 km (-0.4 mi), shallow
Epicenter
39.159° N, 123.357° 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 0.6 km horizontally, 2.2 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
143°
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: 163 in the 60 days after this one and 98 in the 30 days before it.

After

  1. 1.57 km W of Cobb, California · 14240 days ago · 3 km deep · 61 km away
  2. 1.74 km WSW of Cobb, California · 14239 days ago · 2 km deep · 65 km away
  3. 1.57 km W of Cobb, California · 14239 days ago · 0 km deep · 60 km away
  4. 1.56 km WNW of Cobb, California · 14238 days ago · 0 km deep · 60 km away
  5. 3.16 km W of Cobb, California · 14237 days ago · 3 km deep · 62 km away
  6. 1.611 km WNW of Calistoga, California · 14237 days ago · 7 km deep · 83 km away
  7. 1.72 km NNW of Clear Lake Riviera, California · 14237 days ago · 8 km deep · 57 km away
  8. 2.04 km SW of Hopland, California · 14235 days ago · 4 km deep · 29 km away
  9. 3.16 km W of Cobb, California · 14235 days ago · 4 km deep · 61 km away
  10. 1.86 km W of Cobb, California · 14235 days ago · 3 km deep · 61 km away
  11. 1.54 km WSW of Cobb, California · 14234 days ago · 1 km deep · 64 km away
  12. 1.56 km W of Cobb, California · 14234 days ago · 3 km deep · 61 km away
  13. 2.16 km SW of Cobb, California · 14233 days ago · 1 km deep · 65 km away
  14. 1.67 km W of Cobb, California · 14233 days ago · 1 km deep · 60 km away
  15. 1.85 km WSW of Cobb, California · 14233 days ago · 0 km deep · 64 km away
  16. 1.94 km NW of Philo, California · 14233 days ago · -1 km deep · 13 km away
  17. 1.59 km WSW of Cobb, California · 14233 days ago · 1 km deep · 61 km away
  18. 2.3Northern California · 14233 days ago · 1 km deep · 59 km away
  19. 2.37 km NNE of Hopland, California · 14232 days ago · 1 km deep · 29 km away
  20. 1.96 km W of Cobb, California · 14232 days ago · 3 km deep · 61 km away
  21. 1.66 km W of Cobb, California · 14232 days ago · 3 km deep · 61 km away
  22. 1.85 km W of Cobb, California · 14232 days ago · 2 km deep · 62 km away
  23. 2.55 km W of Cobb, California · 14232 days ago · 2 km deep · 62 km away
  24. 1.68 km W of Cobb, California · 14231 days ago · 3 km deep · 61 km away
  25. 1.66 km SW of Cobb, California · 14231 days ago · 0 km deep · 66 km away
  26. 2.24 km S of Cobb, California · 14231 days ago · 2 km deep · 69 km away
  27. 2.28 km WSW of Cobb, California · 14231 days ago · 0 km deep · 62 km away
  28. 1.54 km W of Cobb, California · 14230 days ago · -1 km deep · 63 km away
  29. 1.913 km SSW of Willits, California · 14230 days ago · 3 km deep · 18 km away
  30. 1.66 km WSW of Cobb, California · 14229 days ago · -1 km deep · 63 km away
  31. 2.64 km WSW of Cobb, California · 14229 days ago · 2 km deep · 65 km away
  32. 1.74 km WSW of Cobb, California · 14229 days ago · 1 km deep · 64 km away
  33. 1.64 km WSW of Cobb, California · 14229 days ago · 1 km deep · 64 km away
  34. 1.716 km N of Upper Lake, California · 14229 days ago · 7 km deep · 44 km away
  35. 1.66 km SW of Cobb, California · 14228 days ago · 0 km deep · 66 km away
  36. 2.18 km WSW of Cobb, California · 14228 days ago · 0 km deep · 61 km away
  37. 2.510 km E of Cloverdale, California · 14228 days ago · 5 km deep · 56 km away
  38. 1.55 km SSW of Cobb, California · 14227 days ago · 1 km deep · 68 km away
  39. 1.86 km W of Cobb, California · 14227 days ago · 3 km deep · 61 km away
  40. 1.64 km W of Cobb, California · 14227 days ago · 0 km deep · 63 km away
  41. 2.427 km NNE of Potter Valley, California · 14227 days ago · 10 km deep · 55 km away
  42. 1.76 km WSW of Cobb, California · 14226 days ago · 3 km deep · 62 km away
  43. 1.65 km SW of Cobb, California · 14226 days ago · -1 km deep · 67 km away
  44. 2.27 km WSW of Cobb, California · 14226 days ago · 3 km deep · 62 km away
  45. 1.56 km WNW of Cobb, California · 14226 days ago · -1 km deep · 60 km away
  46. 1.79 km WSW of Cobb, California · 14225 days ago · 2 km deep · 61 km away
  47. 1.74 km WSW of Cobb, California · 14225 days ago · -1 km deep · 64 km away
  48. 2.96 km WSW of Cobb, California · 14225 days ago · 1 km deep · 62 km away
  49. 2.16 km WSW of Cobb, California · 14224 days ago · 3 km deep · 62 km away
  50. 1.96 km WSW of Cobb, California · 14224 days ago · 3 km deep · 62 km away
  51. 1.75 km E of Lower Lake, California · 14223 days ago · 8 km deep · 75 km away
  52. 2.54 km WSW of Cobb, California · 14222 days ago · 1 km deep · 64 km away
  53. 1.65 km W of Cobb, California · 14222 days ago · 0 km deep · 62 km away
  54. 2.05 km W of Cobb, California · 14221 days ago · 1 km deep · 61 km away
  55. 1.68 km WSW of Cobb, California · 14221 days ago · 1 km deep · 61 km away
  56. 1.78 km W of Cobb, California · 14221 days ago · -1 km deep · 60 km away
  57. 2.03 km SSE of Philo, California · 14221 days ago · 5 km deep · 16 km away
  58. 2.34 km NNE of Hopland, California · 14221 days ago · 3 km deep · 28 km away
  59. 2.03 km NW of Santa Rosa, California · 14220 days ago · 7 km deep · 94 km away
  60. 2.08 km W of Cobb, California · 14220 days ago · 1 km deep · 59 km away

The first 60 of 163.

Before

  1. 1.77 km W of Cobb, California · 14240 days ago · 0 km deep · 60 km away
  2. 1.85 km W of Cobb, California · 14240 days ago · 1 km deep · 62 km away
  3. 1.75 km WSW of Cobb, California · 14242 days ago · -1 km deep · 64 km away
  4. 2.19 km W of Cobb, California · 14242 days ago · 0 km deep · 59 km away
  5. 1.96 km S of Clear Lake Riviera, California · 14242 days ago · -1 km deep · 61 km away
  6. 1.86 km WSW of Cobb, California · 14242 days ago · 4 km deep · 62 km away
  7. 1.57 km W of Cobb, California · 14243 days ago · 3 km deep · 61 km away
  8. 1.710 km W of Cobb, California · 14244 days ago · 1 km deep · 57 km away
  9. 2.06 km W of Cobb, California · 14244 days ago · 3 km deep · 61 km away
  10. 2.011 km W of Cobb, California · 14244 days ago · 2 km deep · 57 km away
  11. 1.64 km N of Clear Lake Riviera, California · 14244 days ago · 1 km deep · 58 km away
  12. 3.25 km SW of Cobb, California · 14245 days ago · 0 km deep · 65 km away
  13. 3.05 km SW of Cobb, California · 14245 days ago · 0 km deep · 65 km away
  14. 1.54 km WSW of Cobb, California · 14246 days ago · 0 km deep · 64 km away
  15. 2.62 km ESE of Mendocino, California · 14247 days ago · 26 km deep · 39 km away
  16. 1.86 km WSW of Cobb, California · 14247 days ago · 0 km deep · 63 km away
  17. 1.77 km WSW of Cobb, California · 14247 days ago · 1 km deep · 63 km away
  18. 2.97 km WSW of Cobb, California · 14247 days ago · 1 km deep · 61 km away
  19. 2.55 km W of Cobb, California · 14248 days ago · 3 km deep · 62 km away
  20. 2.25 km SSW of Cobb, California · 14248 days ago · 12 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1152998. Read Mon, Sep 28, 2026, 10:42 PM UTC.