California earthquakes

M2.5 earthquake 5 km SW of Cobb, California

A magnitude 2.5 earthquake struck 5 km SW of Cobb, California on Fri, Sep 18, 1987, 7:50 PM PDT (02:50 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.4 4 km W of Cobb, California. This one was a foreshock.

Cobb forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
2.5 (md), micro
Local time
UTC
1987-09-19 02:50:25 UTC
Depth
1.3 km (0.8 mi), shallow
Epicenter
38.786° N, 122.773° 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 0.2 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
65°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 157 in the 60 days after this one and 107 in the 30 days before it.

After

  1. 2.46 km W of Cobb, California · 14256 days ago · 2 km deep · 4 km away
  2. 1.98 km W of Cobb, California · 14256 days ago · -1 km deep · 6 km away
  3. 2.58 km W of Cobb, California · 14256 days ago · 1 km deep · 5 km away
  4. 1.93 km NNW of Cloverdale, California · 14255 days ago · -1 km deep · 23 km away
  5. 1.97 km WSW of Cobb, California · 14254 days ago · 1 km deep · 4 km away
  6. 3.44 km W of Cobb, California · 14254 days ago · 2 km deep · 5 km away
  7. 1.77 km W of Cobb, California · 14254 days ago · -1 km deep · 6 km away
  8. 1.55 km WNW of Cobb, California · 14254 days ago · 1 km deep · 5 km away
  9. 1.77 km WSW of Cobb, California · 14253 days ago · 2 km deep · 4 km away
  10. 2.05 km WSW of Cobb, California · 14252 days ago · 1 km deep · 1 km away
  11. 1.74 km SE of Clear Lake Riviera, California · 14252 days ago · 7 km deep · 18 km away
  12. 1.97 km W of Cobb, California · 14252 days ago · 3 km deep · 4 km away
  13. 2.06 km WSW of Cobb, California · 14252 days ago · 1 km deep · 3 km away
  14. 2.77 km WSW of Cobb, California · 14252 days ago · 3 km deep · 3 km away
  15. 1.78 km W of Cobb, California · 14251 days ago · 1 km deep · 6 km away
  16. 1.711 km W of Cobb, California · 14250 days ago · 4 km deep · 8 km away
  17. 2.15 km SW of Cobb, California · 14250 days ago · 0 km deep · 1 km away
  18. 3.05 km SW of Cobb, California · 14250 days ago · 0 km deep · 1 km away
  19. 1.86 km WSW of Cobb, California · 14250 days ago · 0 km deep · 3 km away
  20. 1.76 km SW of Cobb, California · 14250 days ago · 0 km deep · 0 km away
  21. 1.65 km WSW of Cobb, California · 14249 days ago · 0 km deep · 2 km away
  22. 2.25 km SSW of Cobb, California · 14249 days ago · 12 km deep · 2 km away
  23. 2.55 km W of Cobb, California · 14249 days ago · 3 km deep · 4 km away
  24. 2.97 km WSW of Cobb, California · 14248 days ago · 1 km deep · 4 km away
  25. 1.77 km WSW of Cobb, California · 14248 days ago · 1 km deep · 3 km away
  26. 1.86 km WSW of Cobb, California · 14248 days ago · 0 km deep · 3 km away
  27. 1.54 km WSW of Cobb, California · 14247 days ago · 0 km deep · 3 km away
  28. 3.05 km SW of Cobb, California · 14246 days ago · 0 km deep · 1 km away
  29. 3.25 km SW of Cobb, California · 14246 days ago · 0 km deep · 1 km away
  30. 1.64 km N of Clear Lake Riviera, California · 14245 days ago · 1 km deep · 24 km away
  31. 2.011 km W of Cobb, California · 14245 days ago · 2 km deep · 8 km away
  32. 2.06 km W of Cobb, California · 14245 days ago · 3 km deep · 4 km away
  33. 1.710 km W of Cobb, California · 14245 days ago · 1 km deep · 8 km away
  34. 1.57 km W of Cobb, California · 14244 days ago · 3 km deep · 4 km away
  35. 1.86 km WSW of Cobb, California · 14243 days ago · 4 km deep · 3 km away
  36. 1.96 km S of Clear Lake Riviera, California · 14243 days ago · -1 km deep · 13 km away
  37. 2.19 km W of Cobb, California · 14243 days ago · 0 km deep · 6 km away
  38. 1.75 km WSW of Cobb, California · 14242 days ago · -1 km deep · 1 km away
  39. 1.54 km SW of Kenwood, California · 14242 days ago · 2 km deep · 47 km away
  40. 1.85 km W of Cobb, California · 14241 days ago · 1 km deep · 4 km away
  41. 1.77 km W of Cobb, California · 14241 days ago · 0 km deep · 6 km away
  42. 2.112 km NE of Philo, California · 14241 days ago · -1 km deep · 65 km away
  43. 1.57 km W of Cobb, California · 14241 days ago · 3 km deep · 5 km away
  44. 1.74 km WSW of Cobb, California · 14240 days ago · 2 km deep · 2 km away
  45. 1.57 km W of Cobb, California · 14240 days ago · 0 km deep · 6 km away
  46. 1.7Northern California · 14239 days ago · 2 km deep · 47 km away
  47. 1.56 km WNW of Cobb, California · 14239 days ago · 0 km deep · 6 km away
  48. 1.71 km ENE of American Canyon, California · 14238 days ago · 9 km deep · 82 km away
  49. 3.16 km W of Cobb, California · 14238 days ago · 3 km deep · 4 km away
  50. 1.611 km WNW of Calistoga, California · 14238 days ago · 7 km deep · 20 km away
  51. 1.72 km NNW of Clear Lake Riviera, California · 14238 days ago · 8 km deep · 21 km away
  52. 2.04 km SW of Hopland, California · 14236 days ago · 4 km deep · 38 km away
  53. 3.16 km W of Cobb, California · 14236 days ago · 4 km deep · 4 km away
  54. 1.86 km W of Cobb, California · 14236 days ago · 3 km deep · 4 km away
  55. 1.54 km WSW of Cobb, California · 14235 days ago · 1 km deep · 3 km away
  56. 1.56 km W of Cobb, California · 14235 days ago · 3 km deep · 4 km away
  57. 2.16 km SW of Cobb, California · 14234 days ago · 1 km deep · 0 km away
  58. 1.67 km W of Cobb, California · 14234 days ago · 1 km deep · 6 km away
  59. 1.85 km WSW of Cobb, California · 14234 days ago · 0 km deep · 2 km away
  60. 1.94 km NW of Philo, California · 14234 days ago · -1 km deep · 70 km away

The first 60 of 157.

Before

  1. 1.76 km W of Cobb, California · 14256 days ago · 1 km deep · 5 km away
  2. 2.018 km NE of Potter Valley, California · 14256 days ago · 6 km deep · 77 km away
  3. 1.65 km SW of Cobb, California · 14257 days ago · -1 km deep · 1 km away
  4. 1.617 km N of Upper Lake, California · 14257 days ago · 1 km deep · 60 km away
  5. 1.52 km NNE of Cloverdale, California · 14258 days ago · 0 km deep · 21 km away
  6. 1.74 km W of Cobb, California · 14258 days ago · 0 km deep · 5 km away
  7. 1.94 km W of Cobb, California · 14258 days ago · 1 km deep · 4 km away
  8. 1.69 km WSW of Cobb, California · 14258 days ago · 0 km deep · 5 km away
  9. 2.15 km WSW of Cobb, California · 14258 days ago · 1 km deep · 2 km away
  10. 2.39 km SE of Sonoma, California · 14258 days ago · 7 km deep · 70 km away
  11. 1.86 km W of Cobb, California · 14259 days ago · 1 km deep · 3 km away
  12. 1.64 km W of Cobb, California · 14259 days ago · -1 km deep · 4 km away
  13. 1.95 km WSW of Cobb, California · 14259 days ago · 1 km deep · 3 km away
  14. 1.98 km WSW of Cobb, California · 14260 days ago · 3 km deep · 4 km away
  15. 1.63 km NNW of Cloverdale, California · 14260 days ago · -1 km deep · 23 km away
  16. 1.64 km W of Cobb, California · 14260 days ago · 0 km deep · 4 km away
  17. 3.024 km NE of Potter Valley, California · 14261 days ago · -1 km deep · 77 km away
  18. 1.921 km NE of Potter Valley, California · 14261 days ago · 11 km deep · 77 km away
  19. 1.721 km NE of Potter Valley, California · 14261 days ago · 11 km deep · 77 km away
  20. 1.922 km NE of Potter Valley, California · 14261 days ago · 10 km deep · 77 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc106039. Read Tue, Sep 29, 2026, 9:03 PM UTC.