California earthquakes

M1.5 earthquake 4 km WSW of Cobb, California

A magnitude 1.5 earthquake struck 4 km WSW of Cobb, California on Fri, Oct 9, 1987, 9:01 AM PDT (16:01 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.2 5 km SW 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.

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The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1987-10-09 16:01:58 UTC
Depth
1.0 km (0.6 mi), shallow
Epicenter
38.809° N, 122.774° 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 0.3 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
87°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 166 in the 60 days after this one and 99 in the 30 days before it.

After

  1. 1.56 km W of Cobb, California · 14237 days ago · 3 km deep · 2 km away
  2. 2.16 km SW of Cobb, California · 14237 days ago · 1 km deep · 3 km away
  3. 1.67 km W of Cobb, California · 14236 days ago · 1 km deep · 4 km away
  4. 1.85 km WSW of Cobb, California · 14236 days ago · 0 km deep · 1 km away
  5. 1.94 km NW of Philo, California · 14236 days ago · -1 km deep · 69 km away
  6. 1.59 km WSW of Cobb, California · 14236 days ago · 1 km deep · 5 km away
  7. 2.3Northern California · 14236 days ago · 1 km deep · 6 km away
  8. 2.37 km NNE of Hopland, California · 14235 days ago · 1 km deep · 35 km away
  9. 1.96 km W of Cobb, California · 14235 days ago · 3 km deep · 2 km away
  10. 1.66 km W of Cobb, California · 14235 days ago · 3 km deep · 2 km away
  11. 1.85 km W of Cobb, California · 14235 days ago · 2 km deep · 2 km away
  12. 2.55 km W of Cobb, California · 14235 days ago · 2 km deep · 2 km away
  13. 1.68 km W of Cobb, California · 14234 days ago · 3 km deep · 4 km away
  14. 1.66 km SW of Cobb, California · 14234 days ago · 0 km deep · 3 km away
  15. 2.24 km S of Cobb, California · 14234 days ago · 2 km deep · 5 km away
  16. 2.28 km WSW of Cobb, California · 14234 days ago · 0 km deep · 4 km away
  17. 1.54 km W of Cobb, California · 14233 days ago · -1 km deep · 1 km away
  18. 1.913 km SSW of Willits, California · 14233 days ago · 3 km deep · 80 km away
  19. 2.04 km SSE of Napa, California · 14232 days ago · 12 km deep · 75 km away
  20. 1.66 km WSW of Cobb, California · 14232 days ago · -1 km deep · 2 km away
  21. 2.64 km WSW of Cobb, California · 14232 days ago · 2 km deep · 1 km away
  22. 1.74 km WSW of Cobb, California · 14232 days ago · 1 km deep · 1 km away
  23. 1.64 km WSW of Cobb, California · 14232 days ago · 1 km deep · 1 km away
  24. 1.716 km N of Upper Lake, California · 14232 days ago · 7 km deep · 56 km away
  25. 1.66 km SW of Cobb, California · 14231 days ago · 0 km deep · 3 km away
  26. 2.18 km WSW of Cobb, California · 14231 days ago · 0 km deep · 4 km away
  27. 2.510 km E of Cloverdale, California · 14231 days ago · 5 km deep · 10 km away
  28. 1.55 km SSW of Cobb, California · 14230 days ago · 1 km deep · 4 km away
  29. 1.86 km W of Cobb, California · 14230 days ago · 3 km deep · 2 km away
  30. 1.64 km W of Cobb, California · 14230 days ago · 0 km deep · 1 km away
  31. 2.427 km NNE of Potter Valley, California · 14230 days ago · 10 km deep · 81 km away
  32. 1.76 km WSW of Cobb, California · 14229 days ago · 3 km deep · 2 km away
  33. 1.65 km SW of Cobb, California · 14229 days ago · -1 km deep · 3 km away
  34. 2.27 km WSW of Cobb, California · 14229 days ago · 3 km deep · 3 km away
  35. 1.56 km WNW of Cobb, California · 14229 days ago · -1 km deep · 3 km away
  36. 1.79 km WSW of Cobb, California · 14228 days ago · 2 km deep · 5 km away
  37. 1.74 km WSW of Cobb, California · 14228 days ago · -1 km deep · 1 km away
  38. 2.96 km WSW of Cobb, California · 14228 days ago · 1 km deep · 2 km away
  39. 2.16 km WSW of Cobb, California · 14227 days ago · 3 km deep · 2 km away
  40. 1.96 km WSW of Cobb, California · 14227 days ago · 3 km deep · 2 km away
  41. 1.75 km E of Lower Lake, California · 14226 days ago · 8 km deep · 23 km away
  42. 2.54 km WSW of Cobb, California · 14225 days ago · 1 km deep · 0 km away
  43. 1.65 km W of Cobb, California · 14225 days ago · 0 km deep · 1 km away
  44. 2.05 km W of Cobb, California · 14224 days ago · 1 km deep · 3 km away
  45. 1.68 km WSW of Cobb, California · 14224 days ago · 1 km deep · 4 km away
  46. 1.78 km W of Cobb, California · 14224 days ago · -1 km deep · 4 km away
  47. 2.03 km SSE of Philo, California · 14224 days ago · 5 km deep · 62 km away
  48. 2.34 km NNE of Hopland, California · 14224 days ago · 3 km deep · 35 km away
  49. 2.03 km NW of Santa Rosa, California · 14223 days ago · 7 km deep · 38 km away
  50. 2.08 km W of Cobb, California · 14223 days ago · 1 km deep · 5 km away
  51. 1.88 km WSW of Upper Lake, California · 14223 days ago · 8 km deep · 41 km away
  52. 1.87 km WSW of Cobb, California · 14222 days ago · 3 km deep · 2 km away
  53. 2.77 km W of Cobb, California · 14222 days ago · -1 km deep · 3 km away
  54. 1.66 km W of Cobb, California · 14222 days ago · -1 km deep · 2 km away
  55. 1.69 km WNW of Cobb, California · 14222 days ago · 2 km deep · 7 km away
  56. 2.06 km W of Cobb, California · 14222 days ago · 2 km deep · 3 km away
  57. 1.54 km NNE of Clearlake, California · 14222 days ago · -1 km deep · 25 km away
  58. 2.05 km WNW of Cobb, California · 14222 days ago · 3 km deep · 4 km away
  59. 1.95 km SW of Cobb, California · 14221 days ago · 0 km deep · 2 km away
  60. 2.15 km SW of Cobb, California · 14221 days ago · 3 km deep · 2 km away

The first 60 of 166.

Before

  1. 1.86 km W of Cobb, California · 14238 days ago · 3 km deep · 2 km away
  2. 3.16 km W of Cobb, California · 14238 days ago · 4 km deep · 2 km away
  3. 2.04 km SW of Hopland, California · 14238 days ago · 4 km deep · 37 km away
  4. 1.72 km NNW of Clear Lake Riviera, California · 14240 days ago · 8 km deep · 19 km away
  5. 1.611 km WNW of Calistoga, California · 14240 days ago · 7 km deep · 22 km away
  6. 3.16 km W of Cobb, California · 14240 days ago · 3 km deep · 2 km away
  7. 1.71 km ENE of American Canyon, California · 14240 days ago · 9 km deep · 84 km away
  8. 1.56 km WNW of Cobb, California · 14241 days ago · 0 km deep · 4 km away
  9. 1.7Northern California · 14241 days ago · 2 km deep · 50 km away
  10. 1.57 km W of Cobb, California · 14242 days ago · 0 km deep · 4 km away
  11. 1.74 km WSW of Cobb, California · 14242 days ago · 2 km deep · 1 km away
  12. 1.57 km W of Cobb, California · 14243 days ago · 3 km deep · 3 km away
  13. 2.112 km NE of Philo, California · 14243 days ago · -1 km deep · 64 km away
  14. 1.77 km W of Cobb, California · 14243 days ago · 0 km deep · 4 km away
  15. 1.85 km W of Cobb, California · 14243 days ago · 1 km deep · 2 km away
  16. 1.54 km SW of Kenwood, California · 14244 days ago · 2 km deep · 50 km away
  17. 1.75 km WSW of Cobb, California · 14245 days ago · -1 km deep · 1 km away
  18. 2.19 km W of Cobb, California · 14245 days ago · 0 km deep · 5 km away
  19. 1.96 km S of Clear Lake Riviera, California · 14245 days ago · -1 km deep · 10 km away
  20. 1.86 km WSW of Cobb, California · 14245 days ago · 4 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1153095. Read Thu, Oct 1, 2026, 11:13 PM UTC.