California earthquakes

M1.6 earthquake 5 km W of Cobb, California

A magnitude 1.6 earthquake struck 5 km W of Cobb, California on Mon, Dec 20, 1976, 1:30 AM PST (09:30 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.5 Northern 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
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1976-12-20 09:30:21 UTC
Depth
0.8 km (0.5 mi), shallow
Epicenter
38.825° N, 122.791° 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, 0.6 km in depth
Magnitude uncertainty
±0.55
Depth from
From location
Station coverage gap
80°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 89 in the 60 days after this one and 65 in the 30 days before it.

After

  1. 1.911 km ESE of Hidden Valley Lake, California · 18183 days ago · -1 km deep · 32 km away
  2. 2.28 km ESE of Hidden Valley Lake, California · 18182 days ago · -1 km deep · 29 km away
  3. 3.5Northern California · 18182 days ago · 1 km deep · 0 km away
  4. 1.96 km W of Cobb, California · 18182 days ago · 0 km deep · 1 km away
  5. 1.86 km W of Cobb, California · 18182 days ago · 0 km deep · 0 km away
  6. 2.1Northern California · 18181 days ago · 9 km deep · 32 km away
  7. 1.510 km W of Cobb, California · 18181 days ago · 1 km deep · 4 km away
  8. 2.76 km W of Cobb, California · 18181 days ago · 3 km deep · 1 km away
  9. 1.6Northern California · 18181 days ago · 3 km deep · 1 km away
  10. 3.48 km WSW of Cobb, California · 18181 days ago · 4 km deep · 3 km away
  11. 2.96 km W of Cobb, California · 18180 days ago · 4 km deep · 1 km away
  12. 2.218 km NE of Nice, California · 18178 days ago · 3 km deep · 48 km away
  13. 1.816 km SW of Stonyford, California · 18178 days ago · 1 km deep · 52 km away
  14. 1.90 km NNE of Larkfield-Wikiup, California · 18177 days ago · 4 km deep · 34 km away
  15. 2.59 km W of Cobb, California · 18177 days ago · 0 km deep · 4 km away
  16. 1.8Northern California · 18175 days ago · 0 km deep · 4 km away
  17. 1.67 km SW of Calistoga, California · 18175 days ago · 5 km deep · 36 km away
  18. 2.46 km NNE of Penngrove, California · 18174 days ago · 7 km deep · 55 km away
  19. 2.05 km NNE of Penngrove, California · 18174 days ago · 5 km deep · 55 km away
  20. 2.43 km SSE of Moskowite Corner, California · 18174 days ago · 12 km deep · 71 km away
  21. 2.04 km WSW of Cobb, California · 18174 days ago · 3 km deep · 2 km away
  22. 1.75 km W of Cobb, California · 18173 days ago · 0 km deep · 0 km away
  23. 1.57 km W of Cobb, California · 18172 days ago · -1 km deep · 2 km away
  24. 1.95 km E of Clearlake, California · 18172 days ago · 6 km deep · 24 km away
  25. 2.06 km W of Cobb, California · 18172 days ago · -1 km deep · 2 km away
  26. 2.09 km SE of Talmage, California · 18172 days ago · 3 km deep · 38 km away
  27. 1.68 km W of Cobb, California · 18172 days ago · 6 km deep · 2 km away
  28. 1.87 km W of Cobb, California · 18171 days ago · 3 km deep · 2 km away
  29. 1.68 km W of Cobb, California · 18170 days ago · 0 km deep · 3 km away
  30. 1.69 km NE of Hopland, California · 18170 days ago · 7 km deep · 31 km away
  31. 1.96 km WSW of Cobb, California · 18168 days ago · 4 km deep · 2 km away
  32. 1.87 km W of Cobb, California · 18167 days ago · 3 km deep · 1 km away
  33. 1.89 km E of Hidden Valley Lake, California · 18167 days ago · 7 km deep · 30 km away
  34. 1.87 km WSW of Cobb, California · 18166 days ago · -1 km deep · 3 km away
  35. 1.86 km W of Cobb, California · 18166 days ago · 4 km deep · 1 km away
  36. 1.93 km ESE of Moskowite Corner, California · 18166 days ago · 16 km deep · 71 km away
  37. 2.54 km S of Moskowite Corner, California · 18166 days ago · 9 km deep · 70 km away
  38. 2.04 km SSW of Moskowite Corner, California · 18166 days ago · 12 km deep · 69 km away
  39. 1.66 km W of Cobb, California · 18165 days ago · 3 km deep · 1 km away
  40. 2.110 km W of Cobb, California · 18165 days ago · 1 km deep · 5 km away
  41. 2.07 km NE of Hopland, California · 18163 days ago · 3 km deep · 32 km away
  42. 2.18 km WSW of Cobb, California · 18163 days ago · 0 km deep · 3 km away
  43. 1.98 km E of Hopland, California · 18163 days ago · 5 km deep · 25 km away
  44. 1.78 km W of Cobb, California · 18162 days ago · 0 km deep · 3 km away
  45. 2.80 km SSE of Larkfield-Wikiup, California · 18161 days ago · 5 km deep · 35 km away
  46. 2.26 km W of Cobb, California · 18161 days ago · 3 km deep · 1 km away
  47. 1.86 km W of Cobb, California · 18160 days ago · 3 km deep · 1 km away
  48. 2.66 km W of Cobb, California · 18159 days ago · 1 km deep · 1 km away
  49. 1.82 km NNE of Clearlake, California · 18159 days ago · 0 km deep · 23 km away
  50. 1.75 km ESE of Lucerne, California · 18158 days ago · 1 km deep · 29 km away
  51. 1.87 km W of Cobb, California · 18157 days ago · 4 km deep · 2 km away
  52. 1.55 km N of Cobb, California · 18156 days ago · 1 km deep · 8 km away
  53. 2.220 km NE of Upper Lake, California · 18156 days ago · 8 km deep · 54 km away
  54. 1.54 km WNW of Lower Lake, California · 18155 days ago · 2 km deep · 16 km away
  55. 1.98 km S of Calistoga, California · 18155 days ago · 7 km deep · 40 km away
  56. 1.54 km WSW of Cobb, California · 18154 days ago · 1 km deep · 3 km away
  57. 1.84 km WSW of Cobb, California · 18154 days ago · 1 km deep · 3 km away
  58. 2.320 km WSW of Stonyford, California · 18154 days ago · 0 km deep · 56 km away
  59. 1.74 km WSW of Cobb, California · 18154 days ago · 1 km deep · 3 km away
  60. 1.67 km W of Cobb, California · 18154 days ago · 3 km deep · 2 km away

The first 60 of 89.

Before

  1. 1.79 km ESE of Hidden Valley Lake, California · 18184 days ago · -1 km deep · 30 km away
  2. 1.93 km S of Geyserville, California · 18184 days ago · 7 km deep · 19 km away
  3. 1.77 km W of Cobb, California · 18184 days ago · 3 km deep · 1 km away
  4. 1.85 km WSW of Cobb, California · 18186 days ago · 0 km deep · 2 km away
  5. 2.46 km WSW of Cobb, California · 18186 days ago · 0 km deep · 2 km away
  6. 2.010 km ESE of Hidden Valley Lake, California · 18186 days ago · 5 km deep · 30 km away
  7. 2.85 km WSW of Cobb, California · 18186 days ago · 0 km deep · 2 km away
  8. 2.06 km W of Cobb, California · 18186 days ago · 3 km deep · 1 km away
  9. 3.25 km WSW of Cobb, California · 18186 days ago · 0 km deep · 2 km away
  10. 1.82 km SSE of Talmage, California · 18186 days ago · 5 km deep · 45 km away
  11. 2.15 km WSW of Cobb, California · 18187 days ago · 0 km deep · 2 km away
  12. 2.218 km NE of Potter Valley, California · 18187 days ago · 7 km deep · 68 km away
  13. 1.812 km NNE of Upper Lake, California · 18190 days ago · 7 km deep · 50 km away
  14. 1.919 km W of Stonyford, California · 18190 days ago · 0 km deep · 63 km away
  15. 2.06 km WSW of Cobb, California · 18191 days ago · 3 km deep · 2 km away
  16. 1.87 km W of Cobb, California · 18191 days ago · 2 km deep · 1 km away
  17. 1.86 km W of Cobb, California · 18191 days ago · 4 km deep · 1 km away
  18. 2.56 km W of Cobb, California · 18191 days ago · 3 km deep · 1 km away
  19. 2.06 km W of Cobb, California · 18193 days ago · 3 km deep · 0 km away
  20. 2.50 km W of Larkfield-Wikiup, California · 18194 days ago · 6 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1032869. Read Fri, Oct 2, 2026, 9:23 PM UTC.