California earthquakes

M1.6 earthquake 8 km ENE of Willits, California

A magnitude 1.6 earthquake struck 8 km ENE of Willits, California on Thu, Jul 20, 1978, 11:22 AM PDT (18:22 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.3 4 km WSW of Cobb, California. This one was a foreshock.

Willits 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), micro
Local time
UTC
1978-07-20 18:22:48 UTC
Depth
3.7 km (2.3 mi), shallow
Epicenter
39.426° N, 123.260° 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 3.1 km horizontally, 7.7 km in depth
Magnitude uncertainty
±0.41
Depth from
From location
Station coverage gap
221°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 2.34 km WSW of Cobb, California · 17596 days ago · 1 km deep · 81 km away
  2. 1.58 km WSW of Cobb, California · 17595 days ago · 1 km deep · 79 km away
  3. 1.67 km W of Cobb, California · 17595 days ago · 0 km deep · 78 km away
  4. 1.74 km WSW of Cobb, California · 17593 days ago · 3 km deep · 80 km away
  5. 1.57 km W of Cobb, California · 17590 days ago · 4 km deep · 78 km away
  6. 2.39 km WNW of Rancho Tehama Reserve, California · 17589 days ago · 22 km deep · 96 km away
  7. 1.98 km WSW of Rancho Tehama Reserve, California · 17589 days ago · 11 km deep · 91 km away
  8. 2.04 km WSW of Cobb, California · 17589 days ago · 2 km deep · 81 km away
  9. 1.93 km SE of Willows, California · 17588 days ago · 20 km deep · 95 km away
  10. 2.99 km S of Benbow, California · 17587 days ago · -1 km deep · 77 km away
  11. 1.911 km SE of Boonville, California · 17586 days ago · 4 km deep · 56 km away
  12. 1.77 km WSW of Cobb, California · 17585 days ago · 2 km deep · 80 km away
  13. 2.229 km WNW of Cleone, California · 17584 days ago · 4 km deep · 74 km away
  14. 2.26 km W of Cobb, California · 17583 days ago · 3 km deep · 78 km away
  15. 1.710 km ENE of Clearlake Oaks, California · 17582 days ago · -1 km deep · 73 km away
  16. 2.320 km WNW of Jenner, California · 17580 days ago · 0 km deep · 99 km away
  17. 2.612 km SSE of Laytonville, California · 17575 days ago · -1 km deep · 23 km away
  18. 1.82 km ESE of Clear Lake Riviera, California · 17573 days ago · 1 km deep · 73 km away
  19. 1.52 km ESE of Clear Lake Riviera, California · 17573 days ago · 1 km deep · 72 km away
  20. 1.75 km WNW of Cobb, California · 17572 days ago · 3 km deep · 77 km away
  21. 2.08 km W of Lakeport, California · 17570 days ago · 4 km deep · 48 km away
  22. 1.62 km E of Garberville, California · 17570 days ago · 28 km deep · 86 km away
  23. 2.17 km W of Cobb, California · 17570 days ago · 4 km deep · 78 km away
  24. 2.59 km NNW of Redwood Valley, California · 17570 days ago · 2 km deep · 10 km away
  25. 1.56 km ESE of Hidden Valley Lake, California · 17569 days ago · 2 km deep · 98 km away
  26. 2.0Northern California · 17568 days ago · 0 km deep · 95 km away
  27. 1.68 km W of Cobb, California · 17568 days ago · 1 km deep · 78 km away
  28. 1.88 km W of Cobb, California · 17568 days ago · 0 km deep · 78 km away
  29. 2.06 km NE of Willits, California · 17567 days ago · 4 km deep · 4 km away
  30. 1.86 km NE of Willits, California · 17566 days ago · 4 km deep · 5 km away
  31. 1.86 km NE of Willits, California · 17566 days ago · 4 km deep · 4 km away
  32. 1.58 km W of Cobb, California · 17565 days ago · 0 km deep · 78 km away
  33. 1.59 km W of Cobb, California · 17564 days ago · 0 km deep · 77 km away
  34. 1.717 km SE of Alderpoint, California · 17564 days ago · -1 km deep · 74 km away
  35. 1.510 km W of Cobb, California · 17563 days ago · 0 km deep · 76 km away
  36. 1.919 km S of Ruth, California · 17563 days ago · 3 km deep · 75 km away
  37. 1.87 km W of Cobb, California · 17562 days ago · 3 km deep · 78 km away
  38. 1.94 km NE of Redway, California · 17562 days ago · 5 km deep · 92 km away
  39. 1.53 km ENE of Calpella, California · 17561 days ago · 5 km deep · 22 km away
  40. 2.37 km WSW of Cobb, California · 17561 days ago · 1 km deep · 79 km away
  41. 1.98 km WSW of Cobb, California · 17561 days ago · 3 km deep · 80 km away
  42. 1.94 km S of Phillipsville, California · 17561 days ago · 4 km deep · 94 km away
  43. 2.08 km ENE of Benbow, California · 17560 days ago · 14 km deep · 82 km away
  44. 2.21 km SSW of Garberville, California · 17559 days ago · 11 km deep · 87 km away
  45. 2.00 km NNE of Garberville, California · 17558 days ago · 9 km deep · 88 km away
  46. 1.88 km E of Hopland, California · 17555 days ago · 6 km deep · 54 km away
  47. 2.07 km W of Cobb, California · 17555 days ago · 3 km deep · 78 km away
  48. 2.27 km W of Cobb, California · 17555 days ago · 3 km deep · 78 km away
  49. 1.98 km E of Willits, California · 17553 days ago · 4 km deep · 3 km away
  50. 1.79 km ESE of Willits, California · 17553 days ago · 4 km deep · 6 km away
  51. 2.19 km ESE of Willits, California · 17553 days ago · 4 km deep · 6 km away
  52. 2.69 km ESE of Willits, California · 17553 days ago · 2 km deep · 7 km away
  53. 1.99 km ESE of Willits, California · 17553 days ago · 4 km deep · 6 km away
  54. 2.39 km ESE of Willits, California · 17552 days ago · 3 km deep · 6 km away
  55. 1.69 km ESE of Willits, California · 17552 days ago · 4 km deep · 6 km away
  56. 2.77 km W of Cobb, California · 17552 days ago · 3 km deep · 79 km away
  57. 2.66 km E of Willits, California · 17549 days ago · 14 km deep · 3 km away
  58. 2.57 km ESE of Willits, California · 17549 days ago · 5 km deep · 4 km away
  59. 2.86 km ESE of Willits, California · 17548 days ago · 10 km deep · 4 km away
  60. 2.37 km WSW of Cobb, California · 17547 days ago · -1 km deep · 79 km away

The first 60 of 74.

Before

  1. 2.00 km N of Kelseyville, California · 17597 days ago · 3 km deep · 61 km away
  2. 1.98 km ENE of Willits, California · 17598 days ago · 4 km deep · 0 km away
  3. 2.39 km E of Comptche, California · 17599 days ago · 8 km deep · 26 km away
  4. 2.45 km WSW of Cobb, California · 17600 days ago · -1 km deep · 81 km away
  5. 1.88 km WSW of Cobb, California · 17600 days ago · 3 km deep · 79 km away
  6. 1.7Northern California · 17600 days ago · 1 km deep · 81 km away
  7. 2.9Northern California · 17602 days ago · 0 km deep · 80 km away
  8. 1.74 km SE of Calpella, CA · 17602 days ago · 5 km deep · 25 km away
  9. 2.07 km W of Cobb, California · 17604 days ago · 4 km deep · 78 km away
  10. 1.67 km NW of Ruth, California · 17605 days ago · 23 km deep · 99 km away
  11. 1.76 km NW of Ruth, California · 17605 days ago · 20 km deep · 99 km away
  12. 3.37 km NW of Ruth, California · 17605 days ago · 30 km deep · 99 km away
  13. 1.97 km WSW of Cobb, California · 17605 days ago · 2 km deep · 80 km away
  14. 2.07 km WSW of Cobb, California · 17605 days ago · -1 km deep · 80 km away
  15. 1.74 km WSW of Cobb, California · 17607 days ago · 4 km deep · 81 km away
  16. 1.611 km ENE of Healdsburg, California · 17610 days ago · 5 km deep · 95 km away
  17. 1.67 km W of Cobb, California · 17611 days ago · 4 km deep · 79 km away
  18. 1.57 km W of Cobb, California · 17612 days ago · 1 km deep · 78 km away
  19. 1.511 km NE of Healdsburg, California · 17613 days ago · 4 km deep · 93 km away
  20. 2.319 km SSE of Ruth, California · 17613 days ago · 5 km deep · 76 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1041141. Read Wed, Sep 23, 2026, 3:35 AM UTC.