California earthquakes

M1.7 earthquake 5 km WNW of Cobb, California

A magnitude 1.7 earthquake struck 5 km WNW of Cobb, California on Sun, Aug 13, 1978, 9:36 PM PDT (04:36 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.2 4 km SSW of Monument Hills, 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
1978-08-14 04:36:49 UTC
Depth
2.8 km (1.7 mi), shallow
Epicenter
38.837° N, 122.789° 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
±0.11
Depth from
From location
Station coverage gap
41°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 83 in the 60 days after this one and 27 in the 30 days before it.

After

  1. 2.08 km W of Lakeport, California · 17580 days ago · 4 km deep · 30 km away
  2. 2.17 km W of Cobb, California · 17579 days ago · 4 km deep · 3 km away
  3. 2.59 km NNW of Redwood Valley, California · 17579 days ago · 2 km deep · 69 km away
  4. 1.56 km ESE of Hidden Valley Lake, California · 17579 days ago · 2 km deep · 27 km away
  5. 2.715 km E of Angwin, California · 17578 days ago · 0 km deep · 54 km away
  6. 2.0Northern California · 17578 days ago · 0 km deep · 27 km away
  7. 1.68 km W of Cobb, California · 17578 days ago · 1 km deep · 3 km away
  8. 1.88 km W of Cobb, California · 17578 days ago · 0 km deep · 3 km away
  9. 2.06 km NE of Willits, California · 17576 days ago · 4 km deep · 81 km away
  10. 1.86 km NE of Willits, California · 17576 days ago · 4 km deep · 82 km away
  11. 1.86 km NE of Willits, California · 17576 days ago · 4 km deep · 81 km away
  12. 2.814 km E of Angwin, California · 17575 days ago · 7 km deep · 53 km away
  13. 1.58 km W of Cobb, California · 17574 days ago · 0 km deep · 4 km away
  14. 1.59 km W of Cobb, California · 17574 days ago · 0 km deep · 5 km away
  15. 1.510 km W of Cobb, California · 17572 days ago · 0 km deep · 5 km away
  16. 1.87 km W of Cobb, California · 17572 days ago · 3 km deep · 2 km away
  17. 1.53 km ENE of Calpella, California · 17571 days ago · 5 km deep · 56 km away
  18. 2.37 km WSW of Cobb, California · 17571 days ago · 1 km deep · 4 km away
  19. 1.98 km WSW of Cobb, California · 17571 days ago · 3 km deep · 5 km away
  20. 2.63 km WSW of Moskowite Corner, California · 17569 days ago · 5 km deep · 66 km away
  21. 2.43 km W of Moskowite Corner, California · 17569 days ago · 8 km deep · 66 km away
  22. 3.20 km WSW of Monument Hills, California · 17568 days ago · 8 km deep · 81 km away
  23. 2.22 km SSE of Monument Hills, California · 17566 days ago · 9 km deep · 83 km away
  24. 1.88 km E of Hopland, California · 17565 days ago · 6 km deep · 26 km away
  25. 2.07 km W of Cobb, California · 17565 days ago · 3 km deep · 2 km away
  26. 2.27 km W of Cobb, California · 17564 days ago · 3 km deep · 2 km away
  27. 1.98 km E of Willits, California · 17563 days ago · 4 km deep · 75 km away
  28. 2.09 km NE of Inverness, California · 17563 days ago · 4 km deep · 76 km away
  29. 1.79 km ESE of Willits, California · 17562 days ago · 4 km deep · 72 km away
  30. 2.19 km ESE of Willits, California · 17562 days ago · 4 km deep · 72 km away
  31. 2.69 km ESE of Willits, California · 17562 days ago · 2 km deep · 71 km away
  32. 1.99 km ESE of Willits, California · 17562 days ago · 4 km deep · 72 km away
  33. 2.39 km ESE of Willits, California · 17562 days ago · 3 km deep · 72 km away
  34. 1.69 km ESE of Willits, California · 17561 days ago · 4 km deep · 72 km away
  35. 2.77 km W of Cobb, California · 17561 days ago · 3 km deep · 3 km away
  36. 2.66 km E of Willits, California · 17559 days ago · 14 km deep · 76 km away
  37. 2.24 km SE of Cottonwood, California · 17559 days ago · 11 km deep · 78 km away
  38. 2.21 km SW of Monument Hills, California · 17559 days ago · 10 km deep · 81 km away
  39. 1.94 km SSW of Monument Hills, California · 17559 days ago · 16 km deep · 82 km away
  40. 2.57 km ESE of Willits, California · 17558 days ago · 5 km deep · 74 km away
  41. 2.86 km ESE of Willits, California · 17558 days ago · 10 km deep · 76 km away
  42. 1.92 km S of Monument Hills, California · 17558 days ago · 10 km deep · 82 km away
  43. 2.37 km WSW of Cobb, California · 17557 days ago · -1 km deep · 4 km away
  44. 2.320 km NE of Potter Valley, California · 17556 days ago · 6 km deep · 70 km away
  45. 4.24 km SSW of Monument Hills, California · 17556 days ago · 10 km deep · 80 km away
  46. 2.02 km S of Monument Hills, California · 17556 days ago · 9 km deep · 82 km away
  47. 2.519 km NE of Potter Valley, California · 17556 days ago · 5 km deep · 69 km away
  48. 3.32 km SW of Monument Hills, California · 17556 days ago · 12 km deep · 80 km away
  49. 1.77 km W of Cobb, California · 17556 days ago · 2 km deep · 2 km away
  50. 2.33 km SSE of Cottonwood, California · 17555 days ago · 11 km deep · 76 km away
  51. 2.910 km WSW of Hopland, California · 17554 days ago · 4 km deep · 40 km away
  52. 2.56 km SSW of Clear Lake Riviera, California · 17553 days ago · 3 km deep · 8 km away
  53. 2.13 km WNW of Monument Hills, California · 17553 days ago · 1 km deep · 78 km away
  54. 2.412 km SW of Esparto, California · 17553 days ago · 11 km deep · 65 km away
  55. 2.22 km ESE of Calpella, California · 17552 days ago · 6 km deep · 54 km away
  56. 2.710 km W of Hopland, California · 17552 days ago · 4 km deep · 41 km away
  57. 2.17 km W of Cobb, California · 17552 days ago · 1 km deep · 3 km away
  58. 2.14 km SSE of Cloverdale, California · 17550 days ago · 3 km deep · 20 km away
  59. 1.95 km ENE of Willits, California · 17549 days ago · 6 km deep · 78 km away
  60. 2.08 km E of Sea Ranch, California · 17548 days ago · 21 km deep · 51 km away

The first 60 of 83.

Before

  1. 1.52 km ESE of Clear Lake Riviera, California · 17583 days ago · 1 km deep · 15 km away
  2. 1.82 km ESE of Clear Lake Riviera, California · 17583 days ago · 1 km deep · 14 km away
  3. 1.85 km NNE of Crockett, California · 17586 days ago · 1 km deep · 97 km away
  4. 2.08 km NE of Inverness, California · 17587 days ago · 0 km deep · 76 km away
  5. 2.320 km WNW of Jenner, California · 17589 days ago · 0 km deep · 57 km away
  6. 1.710 km ENE of Clearlake Oaks, California · 17592 days ago · -1 km deep · 32 km away
  7. 2.26 km W of Cobb, California · 17592 days ago · 3 km deep · 2 km away
  8. 1.77 km WSW of Cobb, California · 17595 days ago · 2 km deep · 4 km away
  9. 1.911 km SE of Boonville, California · 17596 days ago · 4 km deep · 45 km away
  10. 1.93 km SE of Willows, California · 17598 days ago · 20 km deep · 91 km away
  11. 1.81 km NNE of Inverness, California · 17598 days ago · 5 km deep · 81 km away
  12. 2.04 km WSW of Cobb, California · 17599 days ago · 2 km deep · 4 km away
  13. 1.57 km W of Cobb, California · 17599 days ago · 4 km deep · 3 km away
  14. 1.74 km WSW of Cobb, California · 17603 days ago · 3 km deep · 3 km away
  15. 1.67 km W of Cobb, California · 17605 days ago · 0 km deep · 3 km away
  16. 1.58 km WSW of Cobb, California · 17605 days ago · 1 km deep · 4 km away
  17. 2.34 km WSW of Cobb, California · 17606 days ago · 1 km deep · 4 km away
  18. 1.68 km ENE of Willits, California · 17606 days ago · 4 km deep · 77 km away
  19. 2.00 km N of Kelseyville, California · 17607 days ago · 3 km deep · 17 km away
  20. 2.17 km NE of Inverness, California · 17607 days ago · 1 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1041633. Read Fri, Oct 2, 2026, 9:55 PM UTC.