California earthquakes

M1.8 earthquake 6 km W of Cobb, California

A magnitude 1.8 earthquake struck 6 km W of Cobb, California on Wed, Jul 27, 1983, 1:18 AM PDT (08:18 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.1 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1983-07-27 08:18:46 UTC
Depth
3.2 km (2.0 mi), shallow
Epicenter
38.822° 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, 0.6 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
40°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 97 in the 30 days before it.

After

  1. 1.86 km W of Cobb, California · 15773 days ago · 3 km deep · 0 km away
  2. 1.97 km W of Cobb, California · 15773 days ago · 3 km deep · 1 km away
  3. 1.65 km W of Cobb, California · 15772 days ago · -1 km deep · 1 km away
  4. 1.76 km W of Cobb, California · 15772 days ago · 1 km deep · 1 km away
  5. 1.69 km SW of Kelseyville, California · 15772 days ago · 11 km deep · 16 km away
  6. 1.69 km ESE of Hidden Valley Lake, California · 15772 days ago · 6 km deep · 30 km away
  7. 1.68 km W of Calistoga, California · 15771 days ago · 7 km deep · 29 km away
  8. 2.65 km SW of Cobb, California · 15771 days ago · 0 km deep · 4 km away
  9. 2.55 km SW of Cobb, California · 15771 days ago · -1 km deep · 4 km away
  10. 1.68 km WSW of Cobb, California · 15771 days ago · 1 km deep · 3 km away
  11. 1.96 km WSW of Cobb, California · 15770 days ago · 2 km deep · 3 km away
  12. 1.910 km NE of Cazadero, California · 15770 days ago · 1 km deep · 30 km away
  13. 1.67 km W of Cobb, California · 15770 days ago · 0 km deep · 1 km away
  14. 1.97 km W of Cobb, California · 15769 days ago · 3 km deep · 1 km away
  15. 2.99 km E of Hidden Valley Lake, California · 15769 days ago · 8 km deep · 30 km away
  16. 1.59 km NW of Redwood Valley, California · 15769 days ago · 6 km deep · 70 km away
  17. 1.95 km NNE of Cobb, California · 15769 days ago · 1 km deep · 10 km away
  18. 1.85 km WSW of Cobb, California · 15768 days ago · 0 km deep · 3 km away
  19. 2.27 km W of Cobb, California · 15768 days ago · 3 km deep · 1 km away
  20. 1.67 km WSW of Cobb, California · 15768 days ago · 3 km deep · 3 km away
  21. 2.36 km ESE of Santa Rosa, California · 15768 days ago · 0 km deep · 47 km away
  22. 2.17 km WSW of Cobb, California · 15766 days ago · 2 km deep · 2 km away
  23. 1.914 km N of Potter Valley, California · 15766 days ago · 8 km deep · 75 km away
  24. 2.57 km W of Cobb, California · 15765 days ago · 3 km deep · 1 km away
  25. 1.67 km W of Cobb, California · 15765 days ago · 3 km deep · 1 km away
  26. 1.66 km WSW of Cobb, California · 15765 days ago · 4 km deep · 2 km away
  27. 1.67 km ENE of Brooktrails, California · 15764 days ago · 8 km deep · 86 km away
  28. 2.16 km W of Cobb, California · 15764 days ago · 1 km deep · 1 km away
  29. 1.78 km NW of Redwood Valley, California · 15764 days ago · 5 km deep · 69 km away
  30. 3.15 km SW of Cobb, California · 15763 days ago · 0 km deep · 5 km away
  31. 2.85 km SW of Cobb, California · 15763 days ago · 0 km deep · 4 km away
  32. 1.65 km WSW of Cobb, California · 15763 days ago · 1 km deep · 3 km away
  33. 1.60 km W of Kelseyville, California · 15762 days ago · 2 km deep · 18 km away
  34. 1.96 km W of Cobb, California · 15762 days ago · 3 km deep · 1 km away
  35. 1.713 km NNW of Moskowite Corner, California · 15762 days ago · 0 km deep · 55 km away
  36. 1.612 km WNW of Cobb, California · 15761 days ago · 1 km deep · 6 km away
  37. 1.67 km W of Cobb, California · 15760 days ago · 3 km deep · 1 km away
  38. 1.8Northern California · 15759 days ago · 7 km deep · 28 km away
  39. 1.7near the coast of Northern California · 15759 days ago · 4 km deep · 25 km away
  40. 2.16 km WSW of Cobb, California · 15759 days ago · 1 km deep · 2 km away
  41. 1.66 km W of Cobb, California · 15758 days ago · 4 km deep · 1 km away
  42. 1.57 km W of Cobb, California · 15758 days ago · 3 km deep · 1 km away
  43. 1.94 km SE of Guerneville, California · 15757 days ago · 2 km deep · 40 km away
  44. 1.79 km ESE of Willits, California · 15757 days ago · 7 km deep · 74 km away
  45. 1.51 km SSW of Bodega Bay, California · 15757 days ago · 4 km deep · 60 km away
  46. 1.53 km SE of Clear Lake Riviera, California · 15757 days ago · 1 km deep · 15 km away
  47. 2.03 km SE of Calpella, California · 15756 days ago · 5 km deep · 55 km away
  48. 1.85 km WSW of Cobb, California · 15755 days ago · -1 km deep · 3 km away
  49. 2.05 km WSW of Cobb, California · 15755 days ago · 0 km deep · 3 km away
  50. 1.819 km NNE of Upper Lake, California · 15754 days ago · 5 km deep · 57 km away
  51. 1.75 km W of Cobb, California · 15754 days ago · 2 km deep · 1 km away
  52. 1.84 km WSW of Cobb, California · 15754 days ago · 1 km deep · 3 km away
  53. 2.01 km ESE of Larkfield-Wikiup, California · 15753 days ago · 4 km deep · 35 km away
  54. 1.89 km WSW of Cobb, California · 15753 days ago · 2 km deep · 4 km away
  55. 1.56 km WSW of Cobb, California · 15752 days ago · 0 km deep · 2 km away
  56. 2.06 km ESE of Willits, California · 15752 days ago · 9 km deep · 76 km away
  57. 1.66 km ESE of Willits, California · 15752 days ago · 9 km deep · 76 km away
  58. 1.822 km NE of Potter Valley, California · 15752 days ago · 7 km deep · 74 km away
  59. 2.04 km NNE of Glen Ellen, California · 15751 days ago · 3 km deep · 54 km away
  60. 2.53 km ESE of Kenwood, California · 15751 days ago · 1 km deep · 53 km away

The first 60 of 178.

Before

  1. 2.46 km W of Cobb, California · 15774 days ago · 2 km deep · 1 km away
  2. 2.06 km WSW of Cobb, California · 15775 days ago · 0 km deep · 3 km away
  3. 1.97 km WSW of Cobb, California · 15775 days ago · 1 km deep · 2 km away
  4. 1.65 km NE of Ukiah, California · 15775 days ago · 6 km deep · 52 km away
  5. 1.71 km SSW of Redwood Valley, California · 15776 days ago · 0 km deep · 60 km away
  6. 1.511 km SE of Hidden Valley Lake, California · 15776 days ago · 3 km deep · 31 km away
  7. 2.37 km WSW of Moskowite Corner, California · 15777 days ago · 8 km deep · 64 km away
  8. 1.55 km WSW of Cobb, California · 15777 days ago · 0 km deep · 2 km away
  9. 1.65 km WSW of Cobb, California · 15777 days ago · 0 km deep · 3 km away
  10. 1.86 km WSW of Cobb, California · 15777 days ago · 1 km deep · 3 km away
  11. 1.75 km SW of Cobb, California · 15777 days ago · -1 km deep · 4 km away
  12. 2.17 km ESE of Santa Rosa, California · 15777 days ago · 6 km deep · 47 km away
  13. 1.84 km WSW of Moskowite Corner, California · 15777 days ago · 7 km deep · 65 km away
  14. 1.85 km WSW of Cobb, California · 15778 days ago · 0 km deep · 3 km away
  15. 1.911 km ESE of Hidden Valley Lake, California · 15778 days ago · 6 km deep · 31 km away
  16. 2.07 km W of Kenwood, California · 15778 days ago · 6 km deep · 48 km away
  17. 1.77 km S of Cobb, California · 15778 days ago · -1 km deep · 10 km away
  18. 1.77 km WSW of Cobb, California · 15779 days ago · 3 km deep · 2 km away
  19. 1.79 km W of Cobb, California · 15779 days ago · 2 km deep · 4 km away
  20. 1.95 km S of Cobb, California · 15779 days ago · -1 km deep · 9 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1099381. Read Sat, Oct 3, 2026, 1:56 AM UTC.