California earthquakes

M1.9 earthquake 3 km SE of Willows, California

A magnitude 1.9 earthquake struck 3 km SE of Willows, California on Sat, Jul 29, 1978, 1:33 AM PDT (08:33 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M4.2 4 km SSW of Monument Hills, California. This one was a foreshock.

Willows 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
1.9 (md), micro
Local time
UTC
1978-07-29 08:33:09 UTC
Depth
20.0 km (12.4 mi), shallow
Epicenter
39.499° N, 122.162° 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 0.6 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
283°, poorly surrounded by stations
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: 72 in the 60 days after this one and 45 in the 30 days before it.

After

  1. 1.77 km WSW of Cobb, California · 17589 days ago · 2 km deep · 96 km away
  2. 1.74 km ESE of Palermo, California · 17589 days ago · 5 km deep · 58 km away
  3. 2.26 km W of Cobb, California · 17587 days ago · 3 km deep · 93 km away
  4. 1.710 km ENE of Clearlake Oaks, California · 17586 days ago · -1 km deep · 59 km away
  5. 1.82 km ESE of Clear Lake Riviera, California · 17577 days ago · 1 km deep · 77 km away
  6. 1.52 km ESE of Clear Lake Riviera, California · 17577 days ago · 1 km deep · 77 km away
  7. 1.75 km WNW of Cobb, California · 17576 days ago · 3 km deep · 91 km away
  8. 2.21 km ESE of South Oroville, California · 17576 days ago · 3 km deep · 54 km away
  9. 2.08 km W of Lakeport, California · 17575 days ago · 4 km deep · 89 km away
  10. 2.56 km ESE of Bucks Lake, California · 17575 days ago · 0 km deep · 97 km away
  11. 2.111 km NNE of Clipper Mills, California · 17574 days ago · 15 km deep · 90 km away
  12. 1.810 km W of La Porte, California · 17574 days ago · 8 km deep · 92 km away
  13. 2.17 km W of Cobb, California · 17574 days ago · 4 km deep · 94 km away
  14. 2.59 km NNW of Redwood Valley, California · 17574 days ago · 2 km deep · 96 km away
  15. 1.56 km ESE of Hidden Valley Lake, California · 17573 days ago · 2 km deep · 85 km away
  16. 1.68 km W of Cobb, California · 17572 days ago · 1 km deep · 94 km away
  17. 1.88 km W of Cobb, California · 17572 days ago · 0 km deep · 94 km away
  18. 2.06 km NE of Willits, California · 17571 days ago · 4 km deep · 98 km away
  19. 1.86 km NE of Willits, California · 17570 days ago · 4 km deep · 98 km away
  20. 1.86 km NE of Willits, California · 17570 days ago · 4 km deep · 98 km away
  21. 1.58 km W of Cobb, California · 17569 days ago · 0 km deep · 95 km away
  22. 1.59 km W of Cobb, California · 17568 days ago · 0 km deep · 96 km away
  23. 2.04 km S of Oroville East, California · 17567 days ago · 2 km deep · 59 km away
  24. 1.510 km W of Cobb, California · 17567 days ago · 0 km deep · 95 km away
  25. 2.35 km SE of Bucks Lake, California · 17566 days ago · 1 km deep · 94 km away
  26. 1.87 km W of Cobb, California · 17566 days ago · 3 km deep · 94 km away
  27. 1.53 km ENE of Calpella, California · 17565 days ago · 5 km deep · 90 km away
  28. 2.37 km WSW of Cobb, California · 17565 days ago · 1 km deep · 95 km away
  29. 1.98 km WSW of Cobb, California · 17565 days ago · 3 km deep · 96 km away
  30. 1.81 km E of Oroville East, California · 17565 days ago · 11 km deep · 60 km away
  31. 2.74 km SE of Palermo, California · 17563 days ago · 6 km deep · 58 km away
  32. 3.20 km WSW of Monument Hills, California · 17562 days ago · 8 km deep · 96 km away
  33. 2.22 km SSE of Monument Hills, California · 17560 days ago · 9 km deep · 99 km away
  34. 1.65 km WNW of Bangor, California · 17559 days ago · 5 km deep · 61 km away
  35. 1.88 km E of Hopland, California · 17559 days ago · 6 km deep · 94 km away
  36. 2.07 km W of Cobb, California · 17559 days ago · 3 km deep · 94 km away
  37. 2.27 km W of Cobb, California · 17559 days ago · 3 km deep · 94 km away
  38. 1.98 km E of Willits, California · 17557 days ago · 4 km deep · 94 km away
  39. 1.79 km ESE of Willits, California · 17557 days ago · 4 km deep · 95 km away
  40. 2.19 km ESE of Willits, California · 17557 days ago · 4 km deep · 95 km away
  41. 2.69 km ESE of Willits, California · 17557 days ago · 2 km deep · 95 km away
  42. 1.99 km ESE of Willits, California · 17557 days ago · 4 km deep · 95 km away
  43. 2.39 km ESE of Willits, California · 17556 days ago · 3 km deep · 95 km away
  44. 1.69 km ESE of Willits, California · 17556 days ago · 4 km deep · 95 km away
  45. 2.77 km W of Cobb, California · 17556 days ago · 3 km deep · 94 km away
  46. 2.66 km E of Willits, California · 17554 days ago · 14 km deep · 96 km away
  47. 2.24 km SE of Cottonwood, California · 17553 days ago · 11 km deep · 98 km away
  48. 2.21 km SW of Monument Hills, California · 17553 days ago · 10 km deep · 97 km away
  49. 2.57 km ESE of Willits, California · 17553 days ago · 5 km deep · 96 km away
  50. 2.86 km ESE of Willits, California · 17552 days ago · 10 km deep · 97 km away
  51. 1.92 km S of Monument Hills, California · 17552 days ago · 10 km deep · 98 km away
  52. 2.37 km WSW of Cobb, California · 17551 days ago · -1 km deep · 95 km away
  53. 2.320 km NE of Potter Valley, California · 17551 days ago · 6 km deep · 67 km away
  54. 4.24 km SSW of Monument Hills, California · 17551 days ago · 10 km deep · 99 km away
  55. 2.02 km S of Monument Hills, California · 17551 days ago · 9 km deep · 98 km away
  56. 2.519 km NE of Potter Valley, California · 17551 days ago · 5 km deep · 68 km away
  57. 3.32 km SW of Monument Hills, California · 17550 days ago · 12 km deep · 98 km away
  58. 1.77 km W of Cobb, California · 17550 days ago · 2 km deep · 93 km away
  59. 2.33 km SSE of Cottonwood, California · 17549 days ago · 11 km deep · 98 km away
  60. 2.56 km SSW of Clear Lake Riviera, California · 17548 days ago · 3 km deep · 84 km away

The first 60 of 72.

Before

  1. 2.04 km WSW of Cobb, California · 17593 days ago · 2 km deep · 93 km away
  2. 1.98 km WSW of Rancho Tehama Reserve, California · 17593 days ago · 11 km deep · 62 km away
  3. 2.39 km WNW of Rancho Tehama Reserve, California · 17593 days ago · 22 km deep · 68 km away
  4. 3.07 km NNW of Rancho Tehama Reserve, California · 17593 days ago · 18 km deep · 68 km away
  5. 1.57 km W of Cobb, California · 17594 days ago · 4 km deep · 94 km away
  6. 1.65 km W of Bangor, California · 17597 days ago · 5 km deep · 61 km away
  7. 1.74 km WSW of Cobb, California · 17597 days ago · 3 km deep · 93 km away
  8. 3.34 km W of Bangor, California · 17598 days ago · 5 km deep · 62 km away
  9. 1.67 km W of Cobb, California · 17599 days ago · 0 km deep · 94 km away
  10. 1.58 km WSW of Cobb, California · 17599 days ago · 1 km deep · 96 km away
  11. 2.34 km WSW of Cobb, California · 17600 days ago · 1 km deep · 94 km away
  12. 1.68 km ENE of Willits, California · 17600 days ago · 4 km deep · 95 km away
  13. 1.92 km N of Palermo, California · 17601 days ago · 8 km deep · 53 km away
  14. 2.00 km N of Kelseyville, California · 17601 days ago · 3 km deep · 82 km away
  15. 1.98 km ENE of Willits, California · 17602 days ago · 4 km deep · 94 km away
  16. 2.03 km SE of Palermo, California · 17603 days ago · 6 km deep · 57 km away
  17. 2.45 km WSW of Cobb, California · 17604 days ago · -1 km deep · 94 km away
  18. 1.88 km WSW of Cobb, California · 17604 days ago · 3 km deep · 96 km away
  19. 1.7Northern California · 17604 days ago · 1 km deep · 93 km away
  20. 2.9Northern California · 17606 days ago · 0 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1041276. Read Sun, Sep 27, 2026, 5:49 AM UTC.