California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Sat, Apr 29, 1978, 11:04 PM PST (07:04 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M1.9 6 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.

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The earthquake

Magnitude
1.8 (md), micro
Local time
UTC
1978-04-30 07:04:23 UTC
Depth
1.9 km (1.2 mi), shallow
Epicenter
38.829° N, 122.796° 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
±0.07
Depth from
From location
Station coverage gap
42°
Stations used
15

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 109 in the 30 days before it.

After

  1. 1.96 km W of Cobb, California · 17678 days ago · 2 km deep · 0 km away
  2. 1.87 km ENE of Hidden Valley Lake, California · 17677 days ago · 6 km deep · 28 km away
  3. 1.63 km E of Calpella, California · 17677 days ago · 6 km deep · 54 km away
  4. 1.54 km E of Calpella, California · 17677 days ago · 5 km deep · 54 km away
  5. 2.03 km E of Calpella, California · 17676 days ago · 6 km deep · 54 km away
  6. 1.73 km ESE of Calpella, California · 17676 days ago · 2 km deep · 54 km away
  7. 2.54 km WSW of Cobb, California · 17676 days ago · 1 km deep · 3 km away
  8. 1.83 km SE of Calpella, California · 17676 days ago · 6 km deep · 54 km away
  9. 1.93 km ESE of Calpella, California · 17675 days ago · 3 km deep · 54 km away
  10. 2.125 km NE of Potter Valley, California · 17675 days ago · 14 km deep · 74 km away
  11. 2.03 km E of Calpella, California · 17675 days ago · 7 km deep · 55 km away
  12. 2.06 km SE of Calpella, California · 17675 days ago · 3 km deep · 51 km away
  13. 1.94 km SSE of Calpella, California · 17675 days ago · 4 km deep · 53 km away
  14. 2.35 km SE of Calpella, California · 17675 days ago · 1 km deep · 51 km away
  15. 2.03 km E of Calpella, California · 17675 days ago · 6 km deep · 54 km away
  16. 1.86 km W of Cobb, California · 17674 days ago · 3 km deep · 1 km away
  17. 2.416 km W of Elk Creek, California · 17674 days ago · 4 km deep · 86 km away
  18. 1.93 km SE of Calpella, California · 17673 days ago · 6 km deep · 54 km away
  19. 1.83 km ESE of Calpella, California · 17673 days ago · 4 km deep · 54 km away
  20. 1.58 km WSW of Cobb, California · 17673 days ago · 1 km deep · 3 km away
  21. 1.76 km W of Cobb, California · 17673 days ago · 3 km deep · 1 km away
  22. 2.66 km W of Cobb, California · 17673 days ago · 4 km deep · 1 km away
  23. 1.95 km SE of Calpella, California · 17673 days ago · 5 km deep · 52 km away
  24. 2.23 km ESE of Calpella, California · 17672 days ago · 6 km deep · 54 km away
  25. 2.53 km ESE of Calpella, California · 17670 days ago · 4 km deep · 54 km away
  26. 1.93 km ESE of Calpella, California · 17670 days ago · 2 km deep · 54 km away
  27. 2.54 km E of Calpella, California · 17670 days ago · 2 km deep · 54 km away
  28. 1.64 km ESE of Calpella, California · 17670 days ago · 5 km deep · 53 km away
  29. 2.524 km ENE of Potter Valley, California · 17669 days ago · 0 km deep · 68 km away
  30. 1.84 km ESE of Calpella, California · 17669 days ago · 3 km deep · 54 km away
  31. 1.714 km SSW of Cloverdale, California · 17669 days ago · 0 km deep · 29 km away
  32. 1.88 km SSW of Guinda, California · 17668 days ago · 10 km deep · 49 km away
  33. 2.815 km ESE of Hidden Valley Lake, California · 17668 days ago · 6 km deep · 35 km away
  34. 3.323 km WNW of Elk Creek, California · 17667 days ago · 4 km deep · 98 km away
  35. 3.024 km WNW of Elk Creek, California · 17667 days ago · 11 km deep · 96 km away
  36. 1.98 km W of Cobb, California · 17666 days ago · 2 km deep · 3 km away
  37. 1.99 km ENE of Manchester, California · 17666 days ago · 13 km deep · 70 km away
  38. 1.97 km WSW of Cobb, California · 17664 days ago · 4 km deep · 4 km away
  39. 1.93 km ESE of Calpella, California · 17664 days ago · 4 km deep · 54 km away
  40. 1.73 km ESE of Calpella, California · 17663 days ago · 2 km deep · 54 km away
  41. 2.12 km NW of Redwood Valley, California · 17662 days ago · 9 km deep · 62 km away
  42. 2.722 km NE of Potter Valley, California · 17660 days ago · 9 km deep · 72 km away
  43. 2.921 km NE of Potter Valley, California · 17660 days ago · 12 km deep · 72 km away
  44. 1.72 km NE of Talmage, California · 17659 days ago · 1 km deep · 47 km away
  45. 2.87 km WSW of Cobb, California · 17658 days ago · 0 km deep · 3 km away
  46. 2.12 km WSW of Green Valley, California · 17657 days ago · 0 km deep · 84 km away
  47. 1.74 km WSW of Cobb, California · 17657 days ago · 3 km deep · 3 km away
  48. 1.67 km W of Cobb, California · 17657 days ago · 4 km deep · 2 km away
  49. 2.22 km WSW of Green Valley, California · 17655 days ago · 6 km deep · 84 km away
  50. 2.46 km WSW of Cobb, California · 17655 days ago · 2 km deep · 2 km away
  51. 1.96 km NE of Princeton, California · 17652 days ago · 15 km deep · 99 km away
  52. 2.37 km WSW of Cobb, California · 17651 days ago · 4 km deep · 4 km away
  53. 3.8Northern California · 17650 days ago · 7 km deep · 32 km away
  54. 1.67 km WSW of Cobb, California · 17650 days ago · 2 km deep · 3 km away
  55. 2.3near the coast of Northern California · 17648 days ago · 6 km deep · 76 km away
  56. 1.69 km SW of Hopland, California · 17647 days ago · -1 km deep · 35 km away
  57. 1.52 km N of Deer Park, California · 17647 days ago · 13 km deep · 42 km away
  58. 1.75 km NE of Ukiah, California · 17646 days ago · 8 km deep · 51 km away
  59. 2.69 km WNW of Healdsburg, California · 17645 days ago · 6 km deep · 27 km away
  60. 2.216 km ENE of Potter Valley, California · 17645 days ago · 0 km deep · 59 km away

The first 60 of 89.

Before

  1. 2.27 km WSW of Cobb, California · 17678 days ago · 4 km deep · 4 km away
  2. 1.73 km E of Calpella, California · 17678 days ago · 7 km deep · 55 km away
  3. 1.93 km ESE of Calpella, California · 17678 days ago · 7 km deep · 54 km away
  4. 2.31 km ESE of Dunnigan, California · 17679 days ago · 17 km deep · 73 km away
  5. 2.824 km WNW of Elk Creek, California · 17680 days ago · 4 km deep · 92 km away
  6. 1.74 km SE of Calpella, California · 17680 days ago · 5 km deep · 52 km away
  7. 1.72 km ESE of Calpella, California · 17681 days ago · 5 km deep · 55 km away
  8. 1.67 km NNE of Clearlake, California · 17681 days ago · 0 km deep · 28 km away
  9. 2.02 km WNW of Clearlake, California · 17681 days ago · 2 km deep · 20 km away
  10. 1.53 km WNW of Moskowite Corner, California · 17681 days ago · 3 km deep · 64 km away
  11. 2.08 km NE of Willits, California · 17681 days ago · 9 km deep · 82 km away
  12. 1.82 km E of Calpella, California · 17681 days ago · 4 km deep · 56 km away
  13. 2.62 km E of Calpella, California · 17682 days ago · 6 km deep · 55 km away
  14. 2.914 km NW of Elk Creek, California · 17683 days ago · 5 km deep · 99 km away
  15. 1.611 km WSW of Cobb, California · 17683 days ago · 4 km deep · 6 km away
  16. 1.66 km WSW of Cobb, California · 17683 days ago · 0 km deep · 3 km away
  17. 1.52 km ESE of Calpella, California · 17684 days ago · 4 km deep · 55 km away
  18. 2.04 km ESE of Calpella, California · 17684 days ago · 5 km deep · 54 km away
  19. 1.53 km SSE of Calpella, California · 17684 days ago · -1 km deep · 53 km away
  20. 2.011 km ESE of Boonville, California · 17685 days ago · -1 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1040069. Read Wed, Sep 23, 2026, 3:21 AM UTC.