California earthquakes

M4.1 earthquake 10 km W of Philo, California

A magnitude 4.1 earthquake struck 10 km W of Philo, California on Fri, Sep 14, 1984, 2:10 AM PDT (09:10 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M4.3 11 km ENE of Clearlake, 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
4.1 (ml), light
Local time
UTC
1984-09-14 09:10:09 UTC
Depth
13.8 km (8.6 mi), shallow
Epicenter
39.053° N, 123.561° 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 27.1 km horizontally, 8.0 km in depth
Depth from
From location
Station coverage gap
175°
Stations used
7

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 146 in the 60 days after this one and 73 in the 30 days before it.

After

  1. 1.613 km SSW of Laytonville, California · 15356 days ago · 1 km deep · 58 km away
  2. 1.56 km WSW of Cobb, California · 15355 days ago · 3 km deep · 72 km away
  3. 1.87 km W of Cobb, California · 15354 days ago · 3 km deep · 70 km away
  4. 1.77 km W of Cobb, California · 15354 days ago · 2 km deep · 70 km away
  5. 1.912 km W of Cobb, California · 15353 days ago · -1 km deep · 65 km away
  6. 1.55 km W of Cobb, California · 15353 days ago · 1 km deep · 72 km away
  7. 2.24 km SE of Clearlake Oaks, California · 15352 days ago · -1 km deep · 80 km away
  8. 1.724 km NNE of Potter Valley, California · 15352 days ago · 3 km deep · 72 km away
  9. 1.70 km WNW of Kelseyville, California · 15351 days ago · -1 km deep · 63 km away
  10. 1.64 km SSE of Clear Lake Riviera, California · 15351 days ago · -1 km deep · 76 km away
  11. 1.825 km SE of Covelo, California · 15351 days ago · 5 km deep · 75 km away
  12. 1.58 km W of Cobb, California · 15351 days ago · 0 km deep · 70 km away
  13. 1.96 km WSW of Cobb, California · 15350 days ago · 0 km deep · 73 km away
  14. 1.77 km SW of Calistoga, California · 15350 days ago · 5 km deep · 99 km away
  15. 1.68 km WSW of Cobb, California · 15350 days ago · 4 km deep · 72 km away
  16. 1.99 km W of Cobb, California · 15349 days ago · 1 km deep · 69 km away
  17. 1.711 km SW of Hopland, California · 15349 days ago · 4 km deep · 34 km away
  18. 1.64 km SW of Cobb, California · 15348 days ago · 1 km deep · 76 km away
  19. 2.64 km NNE of Geyserville, California · 15348 days ago · 4 km deep · 69 km away
  20. 4.09 km WSW of Cobb, California · 15348 days ago · 2 km deep · 70 km away
  21. 2.07 km W of Cobb, California · 15348 days ago · -1 km deep · 69 km away
  22. 1.88 km W of Cobb, California · 15348 days ago · -1 km deep · 69 km away
  23. 2.18 km WSW of Cobb, California · 15348 days ago · 1 km deep · 70 km away
  24. 1.77 km WSW of Cobb, California · 15348 days ago · 0 km deep · 71 km away
  25. 2.24 km S of Cobb, California · 15347 days ago · 2 km deep · 79 km away
  26. 2.319 km SW of Elk Creek, California · 15347 days ago · -1 km deep · 88 km away
  27. 1.821 km ENE of Potter Valley, California · 15347 days ago · 12 km deep · 70 km away
  28. 1.54 km S of Cobb, California · 15347 days ago · 2 km deep · 78 km away
  29. 1.64 km S of Cobb, California · 15347 days ago · 1 km deep · 79 km away
  30. 1.58 km W of Cobb, California · 15347 days ago · 1 km deep · 70 km away
  31. 1.83 km SSW of Cobb, California · 15346 days ago · 1 km deep · 76 km away
  32. 1.74 km S of Cobb, California · 15346 days ago · 1 km deep · 79 km away
  33. 4.311 km ENE of Clearlake, California · 15346 days ago · 4 km deep · 92 km away
  34. 1.73 km SW of Cobb, California · 15345 days ago · 1 km deep · 76 km away
  35. 2.47 km E of Cloverdale, California · 15343 days ago · 3 km deep · 62 km away
  36. 1.67 km E of Hidden Valley Lake, California · 15342 days ago · 6 km deep · 98 km away
  37. 1.67 km ESE of Hidden Valley Lake, California · 15342 days ago · 5 km deep · 98 km away
  38. 2.25 km ESE of Comptche, California · 15342 days ago · 0 km deep · 22 km away
  39. 1.87 km ESE of Hidden Valley Lake, California · 15342 days ago · 5 km deep · 99 km away
  40. 2.17 km WSW of Cobb, California · 15342 days ago · 3 km deep · 71 km away
  41. 2.04 km N of Clearlake, California · 15341 days ago · -1 km deep · 80 km away
  42. 2.07 km W of Cobb, California · 15341 days ago · 3 km deep · 70 km away
  43. 1.96 km W of Cobb, California · 15341 days ago · 3 km deep · 71 km away
  44. 2.07 km ESE of Hidden Valley Lake, California · 15341 days ago · 4 km deep · 98 km away
  45. 1.57 km SW of Calistoga, California · 15340 days ago · 5 km deep · 99 km away
  46. 1.96 km WSW of Cobb, California · 15339 days ago · 3 km deep · 72 km away
  47. 2.47 km W of Cobb, California · 15339 days ago · -1 km deep · 70 km away
  48. 1.54 km W of Cobb, California · 15339 days ago · 0 km deep · 72 km away
  49. 2.86 km W of Cobb, California · 15339 days ago · 3 km deep · 71 km away
  50. 1.88 km NE of Hopland, California · 15337 days ago · 2 km deep · 43 km away
  51. 1.97 km W of Cobb, California · 15336 days ago · -1 km deep · 69 km away
  52. 2.94 km W of Cobb, California · 15336 days ago · 2 km deep · 73 km away
  53. 1.717 km NE of Upper Lake, California · 15335 days ago · 10 km deep · 72 km away
  54. 1.85 km SW of Cobb, California · 15335 days ago · -1 km deep · 74 km away
  55. 2.25 km SW of Cobb, California · 15335 days ago · -1 km deep · 74 km away
  56. 1.74 km WSW of Cobb, California · 15335 days ago · 1 km deep · 74 km away
  57. 2.220 km NNE of Potter Valley, California · 15334 days ago · 6 km deep · 68 km away
  58. 1.84 km S of Cobb, California · 15334 days ago · 1 km deep · 79 km away
  59. 2.32 km NE of Clear Lake Riviera, California · 15334 days ago · 0 km deep · 75 km away
  60. 1.93 km NE of Clear Lake Riviera, California · 15334 days ago · 1 km deep · 76 km away

The first 60 of 146.

Before

  1. 2.1Northern California · 15356 days ago · 11 km deep · 96 km away
  2. 1.65 km SSW of Philo, California · 15357 days ago · -1 km deep · 9 km away
  3. 1.86 km W of Cobb, California · 15357 days ago · 3 km deep · 71 km away
  4. 2.36 km W of Cobb, California · 15358 days ago · 2 km deep · 71 km away
  5. 1.86 km W of Cobb, California · 15358 days ago · 4 km deep · 71 km away
  6. 1.67 km WSW of Cobb, California · 15358 days ago · 2 km deep · 71 km away
  7. 1.96 km W of Cobb, California · 15359 days ago · 3 km deep · 71 km away
  8. 1.78 km WSW of Cobb, California · 15359 days ago · 0 km deep · 70 km away
  9. 3.062 km W of Point Arena, California · 15360 days ago · 4 km deep · 78 km away
  10. 1.86 km W of Cobb, California · 15361 days ago · 0 km deep · 71 km away
  11. 1.98 km W of Cobb, California · 15361 days ago · -1 km deep · 69 km away
  12. 1.63 km NNE of Larkfield-Wikiup, California · 15361 days ago · 7 km deep · 91 km away
  13. 1.86 km W of Cobb, California · 15361 days ago · 3 km deep · 70 km away
  14. 2.15 km SW of Cobb, California · 15361 days ago · 0 km deep · 74 km away
  15. 1.85 km SW of Cobb, California · 15361 days ago · -1 km deep · 74 km away
  16. 3.05 km SW of Cobb, California · 15361 days ago · 0 km deep · 74 km away
  17. 1.95 km SW of Cobb, California · 15362 days ago · 0 km deep · 74 km away
  18. 1.93 km NNE of Talmage, California · 15362 days ago · 6 km deep · 37 km away
  19. 2.09 km SE of Hopland, California · 15364 days ago · 0 km deep · 48 km away
  20. 1.88 km W of Cobb, California · 15364 days ago · 1 km deep · 69 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1120217. Read Wed, Sep 30, 2026, 7:52 AM UTC.