California earthquakes

M1.7 earthquake 7 km W of Cobb, California

A magnitude 1.7 earthquake struck 7 km W of Cobb, California on Sat, Feb 18, 1978, 3:18 PM PST (23:18 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.5 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
1978-02-18 23:18:01 UTC
Depth
3.5 km (2.2 mi), shallow
Epicenter
38.821° N, 122.804° 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, 0.4 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
42°
Stations used
19

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 42 in the 30 days before it.

After

  1. 1.76 km W of Cobb, California · 17759 days ago · -1 km deep · 1 km away
  2. 2.319 km SW of Stonyford, California · 17757 days ago · 9 km deep · 50 km away
  3. 2.48 km NNE of Hopland, California · 17756 days ago · 3 km deep · 35 km away
  4. 1.88 km S of Calistoga, California · 17755 days ago · 6 km deep · 40 km away
  5. 2.416 km NE of Nice, California · 17754 days ago · 7 km deep · 46 km away
  6. 2.46 km ESE of Willits, California · 17753 days ago · 6 km deep · 76 km away
  7. 2.111 km NE of Healdsburg, California · 17753 days ago · 5 km deep · 17 km away
  8. 1.610 km NE of Healdsburg, California · 17751 days ago · 4 km deep · 17 km away
  9. 2.411 km NNW of Potter Valley, California · 17751 days ago · 1 km deep · 73 km away
  10. 1.820 km WSW of Stonyford, CA · 17751 days ago · -1 km deep · 57 km away
  11. 1.83 km S of Clear Lake Riviera, California · 17750 days ago · 2 km deep · 14 km away
  12. 1.6Northern California · 17750 days ago · 3 km deep · 1 km away
  13. 1.66 km W of Cobb, California · 17750 days ago · 3 km deep · 1 km away
  14. 2.13 km SW of Calpella, California · 17750 days ago · 11 km deep · 57 km away
  15. 2.03 km SW of Calpella, California · 17750 days ago · 8 km deep · 58 km away
  16. 2.19 km NNW of Redwood Valley, California · 17749 days ago · 5 km deep · 70 km away
  17. 1.87 km W of Cobb, California · 17745 days ago · 0 km deep · 1 km away
  18. 1.66 km SSE of Boonville, California · 17745 days ago · 6 km deep · 47 km away
  19. 1.96 km W of Cobb, California · 17745 days ago · 3 km deep · 0 km away
  20. 2.53 km ENE of Willits, California · 17743 days ago · 3 km deep · 80 km away
  21. 1.82 km E of Forestville, California · 17742 days ago · 2 km deep · 39 km away
  22. 1.87 km N of Princeton, California · 17742 days ago · 18 km deep · 100 km away
  23. 2.26 km W of Cobb, California · 17740 days ago · 3 km deep · 1 km away
  24. 2.49 km N of Cloverdale, California · 17740 days ago · 5 km deep · 19 km away
  25. 1.77 km W of Cobb, California · 17740 days ago · 1 km deep · 0 km away
  26. 1.77 km WSW of Cobb, California · 17740 days ago · 2 km deep · 2 km away
  27. 2.07 km WSW of Cobb, California · 17738 days ago · -1 km deep · 2 km away
  28. 2.57 km W of Cobb, California · 17736 days ago · 3 km deep · 0 km away
  29. 1.64 km WSW of Cobb, California · 17736 days ago · -1 km deep · 4 km away
  30. 1.719 km NE of Sea Ranch, California · 17735 days ago · 1 km deep · 41 km away
  31. 2.03 km W of Glen Ellen, California · 17735 days ago · 9 km deep · 55 km away
  32. 1.716 km N of Cazadero, California · 17734 days ago · 0 km deep · 32 km away
  33. 1.67 km W of Cobb, California · 17731 days ago · 3 km deep · 1 km away
  34. 1.75 km N of Healdsburg, California · 17729 days ago · 5 km deep · 19 km away
  35. 1.77 km WSW of Middletown, California · 17726 days ago · 2 km deep · 13 km away
  36. 2.47 km WSW of Middletown, California · 17726 days ago · 2 km deep · 13 km away
  37. 2.44 km NNE of Talmage, California · 17725 days ago · 8 km deep · 49 km away
  38. 4.54 km SE of Calpella, California · 17725 days ago · 12 km deep · 53 km away
  39. 2.55 km SSE of Calpella, California · 17725 days ago · 1 km deep · 52 km away
  40. 1.83 km SE of Calpella, California · 17725 days ago · 12 km deep · 54 km away
  41. 1.95 km NNE of Brooktrails, California · 17725 days ago · 1 km deep · 89 km away
  42. 2.04 km SE of Calpella, California · 17725 days ago · 7 km deep · 53 km away
  43. 2.83 km ESE of Calpella, California · 17725 days ago · 6 km deep · 54 km away
  44. 3.23 km ESE of Calpella, California · 17725 days ago · 8 km deep · 54 km away
  45. 2.92 km SSE of Calpella, California · 17725 days ago · 1 km deep · 55 km away
  46. 1.54 km SE of Calpella, California · 17725 days ago · 2 km deep · 53 km away
  47. 2.52 km SE of Calpella, California · 17725 days ago · 4 km deep · 55 km away
  48. 2.65 km SE of Calpella, California · 17725 days ago · 8 km deep · 52 km away
  49. 1.61 km SE of Calpella, California · 17725 days ago · 4 km deep · 55 km away
  50. 2.34 km SE of Calpella, California · 17725 days ago · 4 km deep · 53 km away
  51. 2.25 km SE of Calpella, California · 17725 days ago · 6 km deep · 52 km away
  52. 2.23 km ESE of Calpella, California · 17725 days ago · 6 km deep · 55 km away
  53. 2.55 km NE of Ukiah, California · 17725 days ago · 3 km deep · 51 km away
  54. 1.87 km SE of Calpella, California · 17725 days ago · 2 km deep · 51 km away
  55. 2.74 km SE of Calpella, California · 17725 days ago · 10 km deep · 53 km away
  56. 2.32 km ENE of Calpella, California · 17725 days ago · 4 km deep · 57 km away
  57. 1.65 km SE of Calpella, California · 17725 days ago · 0 km deep · 52 km away
  58. 2.63 km ESE of Calpella, California · 17725 days ago · 6 km deep · 55 km away
  59. 2.64 km SE of Calpella, California · 17725 days ago · 6 km deep · 53 km away
  60. 2.24 km SE of Calpella, California · 17725 days ago · 6 km deep · 53 km away

The first 60 of at least 199.

Before

  1. 1.610 km ESE of Hidden Valley Lake, California · 17761 days ago · 4 km deep · 31 km away
  2. 1.811 km NE of Healdsburg, California · 17761 days ago · 4 km deep · 17 km away
  3. 1.66 km W of Cobb, California · 17762 days ago · 1 km deep · 1 km away
  4. 2.09 km ESE of Black Point-Green Point, California · 17763 days ago · 11 km deep · 88 km away
  5. 2.55 km ESE of Santa Rosa, California · 17764 days ago · 9 km deep · 47 km away
  6. 2.85 km ESE of Santa Rosa, California · 17764 days ago · 9 km deep · 46 km away
  7. 2.56 km W of Cobb, California · 17765 days ago · 3 km deep · 1 km away
  8. 2.16 km W of Cobb, California · 17766 days ago · -1 km deep · 1 km away
  9. 2.46 km W of Cobb, California · 17766 days ago · 2 km deep · 1 km away
  10. 2.37 km NNE of Nice, California · 17767 days ago · 7 km deep · 41 km away
  11. 2.08 km ESE of Talmage, California · 17767 days ago · 8 km deep · 39 km away
  12. 1.66 km WSW of Cobb, California · 17767 days ago · 4 km deep · 1 km away
  13. 2.012 km ESE of Hidden Valley Lake, California · 17768 days ago · 3 km deep · 33 km away
  14. 2.54 km ESE of Willits, California · 17771 days ago · 2 km deep · 77 km away
  15. 2.74 km ESE of Willits, California · 17771 days ago · 2 km deep · 77 km away
  16. 1.67 km W of Cobb, California · 17772 days ago · 0 km deep · 1 km away
  17. 2.27 km NE of Hopland, California · 17773 days ago · 2 km deep · 33 km away
  18. 2.27 km NNE of Hopland, California · 17773 days ago · 1 km deep · 33 km away
  19. 1.84 km WSW of Cobb, California · 17773 days ago · 1 km deep · 3 km away
  20. 2.418 km NE of Upper Lake, California · 17774 days ago · 3 km deep · 53 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1038998. Read Sun, Oct 4, 2026, 11:40 PM UTC.