California earthquakes

M1.7 earthquake 27km SSW of Ludlow, CA

A magnitude 1.7 earthquake struck 27km SSW of Ludlow, CA on Tue, Mar 21, 1978, 5:45 AM PST (13:45 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.0 7km SW of Big Bear Lake, CA. 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
1.7 (mc), micro
Local time
UTC
1978-03-21 13:45:34 UTC
Depth
6.2 km (3.9 mi), shallow
Epicenter
34.491° N, 116.261° 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 0.7 km horizontally, 16.2 km in depth
Depth from
From location
Station coverage gap
157°
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 133 in the 60 days after this one and 74 in the 30 days before it.

After

  1. 1.828km SSW of Ludlow, CA · 17725 days ago · 4 km deep · 1 km away
  2. 1.827km SSW of Ludlow, CA · 17725 days ago · 6 km deep · 0 km away
  3. 2.128km SSW of Ludlow, CA · 17725 days ago · 5 km deep · 1 km away
  4. 1.928km SSW of Ludlow, CA · 17725 days ago · 4 km deep · 1 km away
  5. 1.928km SSW of Ludlow, CA · 17725 days ago · 1 km deep · 1 km away
  6. 1.710km NNE of Running Springs, CA · 17724 days ago · 3 km deep · 78 km away
  7. 2.02km SSE of Big Bear Lake, CA · 17722 days ago · 6 km deep · 66 km away
  8. 2.22km SSE of Big Bear Lake, CA · 17722 days ago · 5 km deep · 66 km away
  9. 1.517km N of Joshua Tree, CA · 17722 days ago · 4 km deep · 23 km away
  10. 1.611km ENE of Cabazon, CA · 17722 days ago · 18 km deep · 71 km away
  11. 2.312km NE of Barstow, CA · 17722 days ago · 2 km deep · 83 km away
  12. 1.72km S of Big Bear Lake, CA · 17720 days ago · 5 km deep · 66 km away
  13. 1.72km S of Big Bear Lake, CA · 17720 days ago · 11 km deep · 66 km away
  14. 1.52km SE of Big Bear Lake, CA · 17720 days ago · 11 km deep · 65 km away
  15. 1.921km ENE of Thermal, CA · 17720 days ago · 2 km deep · 88 km away
  16. 1.66km ENE of Calimesa, CA · 17719 days ago · 9 km deep · 87 km away
  17. 1.74km NNE of Running Springs, CA · 17719 days ago · 3 km deep · 81 km away
  18. 2.88km SW of Barstow, CA · 17719 days ago · 2 km deep · 86 km away
  19. 1.718km N of Joshua Tree, CA · 17718 days ago · 6 km deep · 23 km away
  20. 2.12km SSE of Big Bear Lake, CA · 17718 days ago · 5 km deep · 66 km away
  21. 2.06km W of Desert Hot Springs, CA · 17717 days ago · 6 km deep · 64 km away
  22. 1.85km SW of Morongo Valley, CA · 17717 days ago · 13 km deep · 63 km away
  23. 1.612km NE of Joshua Tree, CA · 17717 days ago · 4 km deep · 31 km away
  24. 1.639km SW of Ludlow, CA · 17717 days ago · 6 km deep · 20 km away
  25. 2.520km ENE of Lucerne Valley, CA · 17716 days ago · 2 km deep · 47 km away
  26. 1.529km ENE of Big Bear City, CA · 17715 days ago · 0 km deep · 31 km away
  27. 4.07km SW of Big Bear Lake, CA · 17714 days ago · 11 km deep · 72 km away
  28. 1.62km S of Big Bear Lake, CA · 17714 days ago · 9 km deep · 66 km away
  29. 1.837km WNW of Desert Center, CA · 17713 days ago · 5 km deep · 84 km away
  30. 1.810km NE of Lake Arrowhead, CA · 17713 days ago · 6 km deep · 80 km away
  31. 2.38km WNW of Twentynine Palms, CA · 17712 days ago · 4 km deep · 38 km away
  32. 2.08km NNE of Banning, CA · 17712 days ago · 11 km deep · 77 km away
  33. 2.512km E of Desert Hot Springs, CA · 17712 days ago · 5 km deep · 58 km away
  34. 1.812km E of Desert Hot Springs, CA · 17712 days ago · 3 km deep · 58 km away
  35. 1.62km S of Big Bear Lake, CA · 17711 days ago · 6 km deep · 66 km away
  36. 1.719km NW of Yucca Valley, CA · 17711 days ago · 5 km deep · 42 km away
  37. 2.413km SE of Big Bear City, CA · 17711 days ago · 3 km deep · 56 km away
  38. 2.212km E of Desert Hot Springs, CA · 17710 days ago · 5 km deep · 57 km away
  39. 2.08km WSW of Beaumont, CA · 17710 days ago · 13 km deep · 98 km away
  40. 1.77km SW of Big Bear Lake, CA · 17708 days ago · 10 km deep · 72 km away
  41. 1.913km N of Banning, CA · 17707 days ago · 15 km deep · 75 km away
  42. 1.52km SE of Big Bear Lake, CA · 17706 days ago · 15 km deep · 65 km away
  43. 1.76km SW of Idyllwild, CA · 17705 days ago · 17 km deep · 99 km away
  44. 1.86km E of Calimesa, CA · 17704 days ago · 15 km deep · 88 km away
  45. 1.56km WNW of Calimesa, CA · 17704 days ago · 17 km deep · 95 km away
  46. 1.66km ESE of Running Springs, CA · 17703 days ago · 5 km deep · 81 km away
  47. 1.622km NE of Lucerne Valley, CA · 17703 days ago · 1 km deep · 52 km away
  48. 2.210km N of Victorville, CA · 17702 days ago · 3 km deep · 96 km away
  49. 1.74km ESE of Yucaipa, CA · 17702 days ago · 17 km deep · 86 km away
  50. 2.421km N of Morongo Valley, CA · 17702 days ago · 9 km deep · 44 km away
  51. 1.925km NNW of Joshua Tree, CA · 17701 days ago · 6 km deep · 20 km away
  52. 2.08km S of Calimesa, CA · 17701 days ago · 14 km deep · 98 km away
  53. 2.04km NNE of Running Springs, CA · 17701 days ago · 4 km deep · 81 km away
  54. 1.75km SSE of Mentone, CA · 17701 days ago · 19 km deep · 93 km away
  55. 2.44km NNE of Running Springs, CA · 17701 days ago · 3 km deep · 82 km away
  56. 2.04km NNE of Running Springs, CA · 17700 days ago · 4 km deep · 82 km away
  57. 1.94km NNE of Running Springs, CA · 17700 days ago · 4 km deep · 81 km away
  58. 1.94km NNE of Running Springs, CA · 17700 days ago · 3 km deep · 81 km away
  59. 1.74km NNE of Running Springs, CA · 17700 days ago · 4 km deep · 81 km away
  60. 1.74km NNE of Running Springs, CA · 17700 days ago · 3 km deep · 81 km away

The first 60 of 133.

Before

  1. 1.62km SSE of Big Bear Lake, CA · 17725 days ago · 11 km deep · 66 km away
  2. 1.87km WNW of Desert Hot Springs, CA · 17725 days ago · 7 km deep · 64 km away
  3. 2.010km WSW of Morongo Valley, CA · 17725 days ago · 13 km deep · 65 km away
  4. 1.813km SW of Lucerne Valley, CA · 17725 days ago · 5 km deep · 75 km away
  5. 1.61km SSW of Big Bear Lake, CA · 17726 days ago · 6 km deep · 67 km away
  6. 1.82km S of Big Bear Lake, CA · 17726 days ago · 4 km deep · 66 km away
  7. 1.616km ENE of Lucerne Valley, CA · 17726 days ago · 0 km deep · 51 km away
  8. 2.02km SSE of Big Bear Lake, CA · 17727 days ago · 5 km deep · 66 km away
  9. 2.214km SW of Lucerne Valley, CA · 17727 days ago · 7 km deep · 76 km away
  10. 1.64km NE of Running Springs, CA · 17728 days ago · 3 km deep · 80 km away
  11. 2.02km SSE of Big Bear Lake, CA · 17728 days ago · 5 km deep · 66 km away
  12. 1.87km WNW of Joshua Tree, CA · 17728 days ago · 8 km deep · 38 km away
  13. 1.97km WNW of Joshua Tree, CA · 17728 days ago · 6 km deep · 38 km away
  14. 2.27km NE of Yucca Valley, CA · 17728 days ago · 1 km deep · 39 km away
  15. 1.816km NNW of Morongo Valley, CA · 17728 days ago · 6 km deep · 52 km away
  16. 2.12km SSE of Big Bear Lake, CA · 17728 days ago · 7 km deep · 66 km away
  17. 2.315km NNW of Morongo Valley, CA · 17728 days ago · 3 km deep · 52 km away
  18. 1.81km SSW of Big Bear Lake, CA · 17728 days ago · 6 km deep · 67 km away
  19. 2.14km NNE of Running Springs, CA · 17729 days ago · 3 km deep · 81 km away
  20. 1.72km S of Big Bear Lake, CA · 17729 days ago · 10 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3338245. Read Wed, Sep 30, 2026, 6:14 AM UTC.