California earthquakes

M2.1 earthquake 12 km SSW of Dillon Beach, California

A magnitude 2.1 earthquake struck 12 km SSW of Dillon Beach, California on Sat, Nov 18, 1978, 5:53 AM PST (13:53 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.4 6 km WSW of Cobb, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1978-11-18 13:53:25 UTC
Depth
2.2 km (1.4 mi), shallow
Epicenter
38.145° N, 123.008° 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 1.9 km horizontally, 25.9 km in depth
Magnitude uncertainty
±0.35
Depth from
From location
Station coverage gap
164°
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: 58 in the 60 days after this one and 26 in the 30 days before it.

After

  1. 2.46 km WSW of Cobb, California · 17485 days ago · 3 km deep · 76 km away
  2. 1.610 km W of Cobb, California · 17482 days ago · 0 km deep · 77 km away
  3. 1.57 km WSW of Cobb, California · 17482 days ago · 4 km deep · 75 km away
  4. 1.56 km W of Cobb, California · 17481 days ago · 4 km deep · 76 km away
  5. 1.98 km W of Cobb, California · 17479 days ago · 1 km deep · 76 km away
  6. 2.28 km W of Cobb, California · 17479 days ago · 0 km deep · 76 km away
  7. 1.68 km W of Cobb, California · 17479 days ago · 0 km deep · 76 km away
  8. 1.78 km W of Cobb, California · 17477 days ago · 1 km deep · 76 km away
  9. 2.17 km W of Cobb, California · 17476 days ago · 1 km deep · 77 km away
  10. 2.113 km ESE of Hidden Valley Lake, California · 17474 days ago · 8 km deep · 85 km away
  11. 2.212 km ESE of Hidden Valley Lake, California · 17473 days ago · 10 km deep · 86 km away
  12. 1.96 km ESE of Hopland, California · 17473 days ago · 4 km deep · 89 km away
  13. 2.26 km W of Cobb, California · 17471 days ago · 3 km deep · 77 km away
  14. 1.76 km NE of Rohnert Park, California · 17471 days ago · 8 km deep · 41 km away
  15. 1.76 km WSW of Cobb, California · 17470 days ago · 0 km deep · 76 km away
  16. 2.57 km W of Cobb, California · 17469 days ago · 3 km deep · 77 km away
  17. 2.57 km W of Cobb, California · 17469 days ago · 3 km deep · 77 km away
  18. 1.69 km W of Cobb, California · 17469 days ago · 0 km deep · 76 km away
  19. 2.39 km WSW of Cobb, California · 17469 days ago · 1 km deep · 75 km away
  20. 1.56 km W of Cobb, California · 17466 days ago · 3 km deep · 77 km away
  21. 2.112 km ESE of Hidden Valley Lake, California · 17466 days ago · 8 km deep · 85 km away
  22. 1.512 km ESE of Hidden Valley Lake, California · 17466 days ago · 8 km deep · 85 km away
  23. 1.64 km E of Saint Helena, California · 17466 days ago · 5 km deep · 66 km away
  24. 1.96 km W of Cobb, California · 17465 days ago · 0 km deep · 78 km away
  25. 3.46 km WSW of Cobb, California · 17465 days ago · 0 km deep · 76 km away
  26. 1.7Northern California · 17465 days ago · 18 km deep · 65 km away
  27. 2.0Northern California · 17464 days ago · 8 km deep · 85 km away
  28. 1.77 km W of Cobb, California · 17464 days ago · -1 km deep · 78 km away
  29. 2.110 km SE of Sonoma, California · 17463 days ago · 7 km deep · 56 km away
  30. 1.810 km SE of Hopland, California · 17461 days ago · 2 km deep · 86 km away
  31. 1.912 km ESE of Hidden Valley Lake, California · 17461 days ago · 8 km deep · 85 km away
  32. 2.13 km E of Berkeley, California · 17460 days ago · 11 km deep · 74 km away
  33. 3.26 km W of Cobb, California · 17459 days ago · 4 km deep · 77 km away
  34. 1.93 km E of Moraga, California · 17459 days ago · 2 km deep · 88 km away
  35. 1.56 km W of Cobb, California · 17459 days ago · 3 km deep · 77 km away
  36. 1.75 km W of Cobb, California · 17456 days ago · 0 km deep · 78 km away
  37. 1.67 km WSW of Cobb, California · 17455 days ago · 1 km deep · 76 km away
  38. 2.411 km ESE of Hidden Valley Lake, California · 17454 days ago · 10 km deep · 86 km away
  39. 1.917 km SW of Hopland, California · 17451 days ago · 1 km deep · 83 km away
  40. 1.98 km WSW of Cobb, California · 17451 days ago · 1 km deep · 75 km away
  41. 1.610 km ESE of Hidden Valley Lake, California · 17450 days ago · 6 km deep · 85 km away
  42. 1.68 km WSW of Cobb, California · 17449 days ago · 1 km deep · 75 km away
  43. 1.67 km WSW of Cobb, California · 17448 days ago · 2 km deep · 75 km away
  44. 1.76 km W of Cobb, California · 17448 days ago · 1 km deep · 78 km away
  45. 1.95 km ESE of Black Point-Green Point, California · 17445 days ago · 5 km deep · 49 km away
  46. 1.98 km WSW of Cobb, California · 17445 days ago · 1 km deep · 75 km away
  47. 1.96 km W of Cobb, California · 17445 days ago · 3 km deep · 77 km away
  48. 2.23 km W of Deer Park, California · 17444 days ago · 8 km deep · 61 km away
  49. 2.07 km WSW of Cobb, California · 17442 days ago · 1 km deep · 75 km away
  50. 1.67 km WSW of Cobb, California · 17440 days ago · 3 km deep · 74 km away
  51. 1.51 km WSW of Moskowite Corner, California · 17440 days ago · 12 km deep · 77 km away
  52. 1.84 km WSW of North Richmond, California · 17437 days ago · 8 km deep · 57 km away
  53. 1.67 km W of Healdsburg, California · 17435 days ago · 1 km deep · 53 km away
  54. 2.45 km E of Black Point-Green Point, California · 17433 days ago · 12 km deep · 49 km away
  55. 1.66 km W of Cobb, California · 17433 days ago · 4 km deep · 77 km away
  56. 1.87 km W of Cobb, California · 17430 days ago · 3 km deep · 77 km away
  57. 1.76 km W of Cobb, California · 17430 days ago · 4 km deep · 77 km away
  58. 2.11 km WNW of Diablo, California · 17429 days ago · 9 km deep · 97 km away

Before

  1. 1.85 km SSW of Saint Helena, California · 17487 days ago · 5 km deep · 57 km away
  2. 1.66 km W of Cobb, California · 17489 days ago · 3 km deep · 77 km away
  3. 1.65 km W of Cobb, California · 17491 days ago · 1 km deep · 78 km away
  4. 1.66 km W of Cobb, California · 17493 days ago · 3 km deep · 78 km away
  5. 1.77 km W of Cobb, California · 17493 days ago · 4 km deep · 76 km away
  6. 2.38 km WSW of Cobb, California · 17494 days ago · 4 km deep · 75 km away
  7. 2.14 km SW of Clearlake, California · 17494 days ago · 0 km deep · 92 km away
  8. 2.34 km SW of Clearlake, California · 17495 days ago · 2 km deep · 92 km away
  9. 2.16 km NNE of Chinatown, California · 17496 days ago · 1 km deep · 65 km away
  10. 1.57 km WSW of Cobb, California · 17496 days ago · 1 km deep · 75 km away
  11. 2.21 km NNE of Montara, California · 17497 days ago · 7 km deep · 79 km away
  12. 1.62 km SSE of Concord, California · 17497 days ago · 10 km deep · 89 km away
  13. 1.810 km S of Muir Beach, California · 17499 days ago · 9 km deep · 57 km away
  14. 2.16 km W of Cobb, California · 17502 days ago · 2 km deep · 78 km away
  15. 1.64 km SSW of Alamo, California · 17505 days ago · 12 km deep · 91 km away
  16. 2.612 km ESE of Hidden Valley Lake, California · 17507 days ago · 7 km deep · 86 km away
  17. 1.87 km SW of Calistoga, California · 17507 days ago · 5 km deep · 53 km away
  18. 2.16 km WSW of Cobb, California · 17508 days ago · 0 km deep · 76 km away
  19. 1.716 km ESE of Hidden Valley Lake, California · 17508 days ago · 8 km deep · 85 km away
  20. 1.616 km ESE of Hidden Valley Lake, California · 17511 days ago · 5 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1043420. Read Sat, Oct 3, 2026, 1:50 PM UTC.