California earthquakes

M2.3 earthquake 2 km ESE of Pacifica, California

A magnitude 2.3 earthquake struck 2 km ESE of Pacifica, California on Mon, Apr 21, 1980, 3:31 AM PST (11:31 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M3.1 13 km ESE of Alum Rock, 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
2.3 (md), micro
Local time
UTC
1980-04-21 11:31:34 UTC
Depth
9.4 km (5.8 mi), shallow
Epicenter
37.601° N, 122.462° 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 0.5 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
101°
Stations used
28

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 86 in the 60 days after this one and 63 in the 30 days before it.

After

  1. 2.42 km SE of Pacifica, California · 16962 days ago · 9 km deep · 0 km away
  2. 2.50 km SW of San Ramon, California · 16962 days ago · 9 km deep · 46 km away
  3. 1.74 km N of East Foothills, California · 16962 days ago · 2 km deep · 60 km away
  4. 1.710 km N of Pittsburg, California · 16961 days ago · 23 km deep · 76 km away
  5. 1.76 km SSE of Livermore, California · 16960 days ago · 5 km deep · 64 km away
  6. 2.517 km ENE of East Foothills, California · 16959 days ago · 5 km deep · 77 km away
  7. 2.11 km SSW of San Ramon, California · 16959 days ago · 8 km deep · 46 km away
  8. 1.68 km SE of Livermore, California · 16959 days ago · 6 km deep · 68 km away
  9. 1.79 km SE of Livermore, California · 16959 days ago · 6 km deep · 68 km away
  10. 2.618 km ENE of East Foothills, California · 16958 days ago · 6 km deep · 77 km away
  11. 1.711 km E of Blackhawk, California · 16958 days ago · 13 km deep · 65 km away
  12. 2.16 km E of Santa Venetia, California · 16958 days ago · 4 km deep · 43 km away
  13. 3.113 km ESE of Alum Rock, California · 16958 days ago · 7 km deep · 75 km away
  14. 2.64 km WNW of Moskowite Corner, California · 16957 days ago · 3 km deep · 98 km away
  15. 2.0Northern California · 16957 days ago · 7 km deep · 75 km away
  16. 2.411 km NNE of Livermore, California · 16957 days ago · 8 km deep · 67 km away
  17. 2.0Northern California · 16957 days ago · 2 km deep · 37 km away
  18. 1.9Northern California · 16957 days ago · 5 km deep · 77 km away
  19. 2.47 km NE of Rohnert Park, California · 16956 days ago · 7 km deep · 88 km away
  20. 2.03 km S of Fairview, California · 16955 days ago · 3 km deep · 37 km away
  21. 1.97 km N of Kenwood, California · 16955 days ago · 7 km deep · 98 km away
  22. 2.09 km ENE of Morgan Hill, California · 16955 days ago · 5 km deep · 94 km away
  23. 1.59 km NE of San Martin, California · 16953 days ago · 7 km deep · 97 km away
  24. 1.610 km E of Blackhawk, California · 16951 days ago · 9 km deep · 65 km away
  25. 1.711 km E of Blackhawk, California · 16950 days ago · 11 km deep · 66 km away
  26. 1.6Northern California · 16950 days ago · 1 km deep · 70 km away
  27. 1.86 km NE of Rohnert Park, California · 16949 days ago · 8 km deep · 89 km away
  28. 1.63 km ESE of Sunnyvale, California · 16947 days ago · 1 km deep · 49 km away
  29. 1.67 km ENE of Santa Rosa, California · 16945 days ago · 4 km deep · 99 km away
  30. 2.011 km SW of Brentwood, California · 16945 days ago · 7 km deep · 66 km away
  31. 1.520 km SE of Livermore, California · 16944 days ago · 1 km deep · 75 km away
  32. 1.87 km SE of Lexington Hills, California · 16944 days ago · 13 km deep · 72 km away
  33. 2.97 km SE of Lexington Hills, California · 16944 days ago · 14 km deep · 72 km away
  34. 1.86 km ENE of Seven Trees, California · 16941 days ago · 6 km deep · 68 km away
  35. 1.83 km ESE of Santa Venetia, California · 16941 days ago · 4 km deep · 43 km away
  36. 2.410 km NNE of Livermore, California · 16940 days ago · 13 km deep · 68 km away
  37. 2.3Northern California · 16940 days ago · 18 km deep · 71 km away
  38. 2.1Northern California · 16940 days ago · 8 km deep · 40 km away
  39. 1.61 km WNW of Inverness, California · 16937 days ago · 10 km deep · 67 km away
  40. 1.93 km SSE of Pleasanton, California · 16937 days ago · 12 km deep · 53 km away
  41. 1.611 km ENE of Blackhawk, California · 16936 days ago · 13 km deep · 66 km away
  42. 1.58 km ENE of Interlaken, California · 16934 days ago · 3 km deep · 98 km away
  43. 1.812 km ESE of East Foothills, California · 16934 days ago · 8 km deep · 75 km away
  44. 2.912 km E of Blackhawk, California · 16933 days ago · 17 km deep · 66 km away
  45. 2.25 km E of Penngrove, California · 16933 days ago · 0 km deep · 79 km away
  46. 1.66 km NE of Kenwood, California · 16933 days ago · 8 km deep · 95 km away
  47. 2.75 km SSW of Oakville, California · 16932 days ago · 9 km deep · 88 km away
  48. 1.61 km SSE of Portola Valley, California · 16931 days ago · 6 km deep · 33 km away
  49. 1.56 km ESE of Lexington Hills, California · 16931 days ago · 12 km deep · 72 km away
  50. 1.97 km NE of Interlaken, California · 16930 days ago · 4 km deep · 98 km away
  51. 1.66 km SW of Antioch, California · 16929 days ago · 19 km deep · 67 km away
  52. 1.51 km S of Los Gatos, California · 16928 days ago · 4 km deep · 61 km away
  53. 1.85 km NE of Morgan Hill, California · 16928 days ago · 5 km deep · 90 km away
  54. 2.59 km NE of San Martin, California · 16927 days ago · 10 km deep · 96 km away
  55. 2.88 km ENE of San Martin, California · 16927 days ago · 2 km deep · 98 km away
  56. 1.62 km NE of East Foothills, California · 16925 days ago · 2 km deep · 63 km away
  57. 2.210 km WSW of Brentwood, California · 16925 days ago · 7 km deep · 66 km away
  58. 1.94 km N of Green Valley, California · 16924 days ago · 12 km deep · 81 km away
  59. 1.88 km ENE of Interlaken, California · 16923 days ago · 3 km deep · 99 km away
  60. 2.7Northern California · 16923 days ago · 9 km deep · 67 km away

The first 60 of 86.

Before

  1. 2.00 km SW of San Ramon, California · 16963 days ago · 9 km deep · 46 km away
  2. 2.45 km ESE of San Ramon, California · 16963 days ago · 7 km deep · 50 km away
  3. 2.412 km SW of Byron, California · 16964 days ago · 12 km deep · 66 km away
  4. 1.79 km SE of Livermore, California · 16965 days ago · 7 km deep · 68 km away
  5. 1.59 km SE of Livermore, California · 16965 days ago · 7 km deep · 69 km away
  6. 1.712 km SSE of Livermore, California · 16965 days ago · 3 km deep · 67 km away
  7. 1.710 km SSE of Livermore, California · 16965 days ago · 4 km deep · 66 km away
  8. 2.39 km ESE of Livermore, California · 16965 days ago · 8 km deep · 69 km away
  9. 1.89 km NNE of East Foothills, California · 16965 days ago · 10 km deep · 61 km away
  10. 2.111 km E of Blackhawk, California · 16966 days ago · 11 km deep · 65 km away
  11. 2.516 km ENE of East Foothills, California · 16966 days ago · 8 km deep · 76 km away
  12. 1.94 km SSW of Muir Beach, California · 16967 days ago · 0 km deep · 28 km away
  13. 2.910 km SSE of Livermore, California · 16968 days ago · 6 km deep · 67 km away
  14. 1.911 km SW of Byron, California · 16969 days ago · 8 km deep · 67 km away
  15. 2.24 km ENE of Fremont, California · 16970 days ago · 9 km deep · 46 km away
  16. 2.011 km SW of Brentwood, California · 16970 days ago · 5 km deep · 66 km away
  17. 1.917 km ESE of East Foothills, California · 16970 days ago · 6 km deep · 79 km away
  18. 1.93 km SSE of Loyola, California · 16970 days ago · 5 km deep · 45 km away
  19. 1.812 km WSW of Byron, California · 16970 days ago · 9 km deep · 66 km away
  20. 1.58 km ENE of San Martin, California · 16971 days ago · 8 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1052326. Read Tue, Sep 29, 2026, 11:01 PM UTC.