California earthquakes

M1.7 earthquake 7 km W of Cobb, California

A magnitude 1.7 earthquake struck 7 km W of Cobb, California on Thu, Aug 30, 1979, 2:50 AM PDT (09:50 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.4 4 km SE of Calpella, 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1979-08-30 09:50:56 UTC
Depth
2.8 km (1.8 mi), shallow
Epicenter
38.822° N, 122.806° 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
±0.07
Depth from
From location
Station coverage gap
48°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 76 in the 60 days after this one and 31 in the 30 days before it.

After

  1. 1.93 km SSE of Clear Lake Riviera, California · 17198 days ago · 3 km deep · 15 km away
  2. 2.39 km ESE of Hidden Valley Lake, California · 17198 days ago · 6 km deep · 31 km away
  3. 3.44 km SE of Calpella, California · 17197 days ago · 7 km deep · 52 km away
  4. 1.54 km SE of Calpella, California · 17197 days ago · 6 km deep · 52 km away
  5. 1.67 km WSW of Cobb, California · 17197 days ago · 2 km deep · 2 km away
  6. 2.010 km NE of Boonville, California · 17197 days ago · 26 km deep · 51 km away
  7. 1.734 km SSW of Sea Ranch, California · 17196 days ago · 5 km deep · 83 km away
  8. 1.624 km S of Sea Ranch, California · 17196 days ago · 37 km deep · 69 km away
  9. 1.9near the coast of Northern California · 17196 days ago · 48 km deep · 29 km away
  10. 2.39 km WSW of Cobb, California · 17196 days ago · 1 km deep · 3 km away
  11. 1.86 km W of Cobb, California · 17195 days ago · 3 km deep · 1 km away
  12. 1.64 km WSW of Cobb, California · 17194 days ago · 4 km deep · 3 km away
  13. 1.64 km SE of Calpella, California · 17194 days ago · 5 km deep · 53 km away
  14. 1.59 km WSW of Cobb, California · 17192 days ago · 1 km deep · 3 km away
  15. 1.67 km W of Cobb, California · 17191 days ago · 1 km deep · 1 km away
  16. 1.67 km SSW of Kelseyville, California · 17190 days ago · 1 km deep · 11 km away
  17. 2.58 km W of Cobb, California · 17189 days ago · -1 km deep · 1 km away
  18. 2.116 km NE of Upper Lake, California · 17187 days ago · 1 km deep · 50 km away
  19. 1.87 km W of Cobb, California · 17187 days ago · 1 km deep · 1 km away
  20. 1.912 km S of Comptche, California · 17185 days ago · 10 km deep · 77 km away
  21. 1.618 km NNE of Upper Lake, California · 17184 days ago · 24 km deep · 55 km away
  22. 1.712 km N of Philo, California · 17184 days ago · 6 km deep · 70 km away
  23. 2.622 km NE of Potter Valley, California · 17184 days ago · 8 km deep · 75 km away
  24. 2.67 km WSW of Cobb, California · 17183 days ago · 2 km deep · 2 km away
  25. 1.57 km W of Cobb, California · 17183 days ago · 3 km deep · 1 km away
  26. 1.85 km ESE of Clearlake Oaks, California · 17183 days ago · 4 km deep · 27 km away
  27. 1.93 km E of Calpella, California · 17183 days ago · 4 km deep · 55 km away
  28. 2.16 km ENE of Point Arena, California · 17181 days ago · 0 km deep · 71 km away
  29. 1.510 km ESE of Hopland, California · 17179 days ago · 4 km deep · 22 km away
  30. 2.03 km SW of Clearlake, California · 17178 days ago · 5 km deep · 18 km away
  31. 1.96 km W of Cobb, California · 17175 days ago · 3 km deep · 0 km away
  32. 1.79 km WSW of Cobb, California · 17174 days ago · 2 km deep · 3 km away
  33. 1.56 km W of Cobb, California · 17174 days ago · 0 km deep · 1 km away
  34. 1.72 km E of Calpella, California · 17173 days ago · 5 km deep · 56 km away
  35. 1.64 km N of Boonville, California · 17172 days ago · 3 km deep · 54 km away
  36. 2.03 km W of Point Arena, California · 17171 days ago · 7 km deep · 81 km away
  37. 1.73 km SW of Hopland, California · 17171 days ago · 2 km deep · 33 km away
  38. 1.77 km W of Cobb, California · 17170 days ago · 3 km deep · 0 km away
  39. 1.88 km NNE of Hopland, California · 17168 days ago · 0 km deep · 35 km away
  40. 2.12 km SE of Larkfield-Wikiup, California · 17167 days ago · 5 km deep · 37 km away
  41. 1.813 km SE of Boonville, California · 17166 days ago · 5 km deep · 41 km away
  42. 2.34 km SSE of Geyserville, California · 17166 days ago · 6 km deep · 19 km away
  43. 2.05 km ESE of Lucerne, California · 17165 days ago · 3 km deep · 29 km away
  44. 3.27 km WSW of Cobb, California · 17165 days ago · 4 km deep · 3 km away
  45. 2.05 km N of American Canyon, California · 17165 days ago · 5 km deep · 82 km away
  46. 1.56 km W of Cobb, California · 17164 days ago · 3 km deep · 0 km away
  47. 2.22 km ESE of Calpella, California · 17164 days ago · 4 km deep · 56 km away
  48. 2.413 km NNE of Angwin, California · 17163 days ago · 11 km deep · 40 km away
  49. 2.24 km SE of Calpella, California · 17163 days ago · 4 km deep · 53 km away
  50. 1.94 km SE of Calpella, California · 17163 days ago · 7 km deep · 53 km away
  51. 1.86 km W of Cobb, California · 17161 days ago · 2 km deep · 1 km away
  52. 3.16 km E of Calpella, California · 17161 days ago · 5 km deep · 53 km away
  53. 2.65 km ENE of Hopland, CA · 17160 days ago · 5 km deep · 29 km away
  54. 1.912 km ESE of Hidden Valley Lake, California · 17160 days ago · 6 km deep · 33 km away
  55. 1.74 km SE of Calpella, California · 17160 days ago · 4 km deep · 53 km away
  56. 1.510 km W of Hopland, California · 17158 days ago · 6 km deep · 41 km away
  57. 1.63 km SW of Clearlake Oaks, California · 17158 days ago · -1 km deep · 22 km away
  58. 1.67 km NNE of Geyserville, California · 17156 days ago · 9 km deep · 9 km away
  59. 2.89 km NE of Benicia, California · 17156 days ago · 5 km deep · 100 km away
  60. 3.09 km N of Green Valley, California · 17156 days ago · 11 km deep · 77 km away

The first 60 of 76.

Before

  1. 2.511 km NNW of Potter Valley, California · 17200 days ago · 9 km deep · 73 km away
  2. 1.56 km W of Cobb, California · 17201 days ago · 3 km deep · 0 km away
  3. 1.69 km WSW of Cobb, California · 17201 days ago · 1 km deep · 3 km away
  4. 1.74 km WSW of Cobb, California · 17204 days ago · 3 km deep · 4 km away
  5. 1.96 km NNE of Rohnert Park, California · 17207 days ago · 10 km deep · 49 km away
  6. 2.87 km WSW of Cobb, California · 17207 days ago · 1 km deep · 2 km away
  7. 1.54 km WSW of Cobb, California · 17209 days ago · 2 km deep · 4 km away
  8. 2.44 km WSW of Cobb, California · 17209 days ago · 1 km deep · 4 km away
  9. 1.53 km WSW of Cobb, California · 17209 days ago · 6 km deep · 4 km away
  10. 2.03 km SSE of Green Valley, California · 17212 days ago · 4 km deep · 88 km away
  11. 2.17 km SSW of Calistoga, California · 17213 days ago · 6 km deep · 38 km away
  12. 1.57 km W of Cobb, California · 17214 days ago · 3 km deep · 1 km away
  13. 1.74 km SE of Calpella, California · 17214 days ago · 6 km deep · 53 km away
  14. 1.74 km NE of Ukiah, California · 17215 days ago · 3 km deep · 51 km away
  15. 2.44 km SE of Calpella, California · 17215 days ago · 6 km deep · 53 km away
  16. 1.66 km WSW of Cobb, California · 17215 days ago · 0 km deep · 2 km away
  17. 1.77 km W of Cobb, California · 17215 days ago · 3 km deep · 1 km away
  18. 2.31 km WSW of Fairfield, California · 17217 days ago · 15 km deep · 91 km away
  19. 1.64 km WSW of Cobb, California · 17217 days ago · 3 km deep · 4 km away
  20. 1.57 km WSW of Cobb, California · 17217 days ago · 6 km deep · 2 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1047486. Read Fri, Oct 2, 2026, 9:24 AM UTC.