California earthquakes

M2.8 earthquake 4 km NNE of Pittsburg, California

A magnitude 2.8 earthquake struck 4 km NNE of Pittsburg, California on Sun, Oct 28, 1984, 3:35 AM PST (11:35 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M3.9 19 km E of Seven Trees, 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
2.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1984-10-28 11:35:46 UTC
Depth
18.1 km (11.3 mi), shallow
Epicenter
38.070° N, 121.873° 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 0.3 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
103°
Stations used
54

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 103 in the 60 days after this one and 53 in the 30 days before it.

After

  1. 1.84 km NE of Pittsburg, California · 15313 days ago · 16 km deep · 3 km away
  2. 1.80 km SW of Pittsburg, California · 15313 days ago · 15 km deep · 5 km away
  3. 1.616 km E of Seven Trees, California · 15313 days ago · 5 km deep · 89 km away
  4. 2.11 km E of North Gate, California · 15312 days ago · 11 km deep · 20 km away
  5. 2.16 km NE of Strawberry, California · 15312 days ago · 9 km deep · 54 km away
  6. 1.613 km N of Morgan Hill, California · 15312 days ago · 3 km deep · 94 km away
  7. 1.81 km ENE of Bodega, California · 15312 days ago · 5 km deep · 99 km away
  8. 1.515 km E of Seven Trees, California · 15312 days ago · 6 km deep · 88 km away
  9. 1.911 km SSE of Livermore, California · 15311 days ago · 6 km deep · 55 km away
  10. 1.69 km NE of Livermore, California · 15311 days ago · 12 km deep · 39 km away
  11. 2.83 km SE of Larkfield-Wikiup, California · 15311 days ago · 6 km deep · 88 km away
  12. 1.715 km N of Morgan Hill, California · 15311 days ago · 6 km deep · 91 km away
  13. 3.12 km SE of Larkfield-Wikiup, California · 15311 days ago · 6 km deep · 88 km away
  14. 3.415 km E of Seven Trees, California · 15311 days ago · 6 km deep · 89 km away
  15. 2.116 km NE of East Foothills, California · 15311 days ago · 6 km deep · 66 km away
  16. 3.919 km E of Seven Trees, California · 15310 days ago · 7 km deep · 88 km away
  17. 2.53 km N of North Fair Oaks, California · 15309 days ago · 9 km deep · 69 km away
  18. 2.914 km N of Morgan Hill, California · 15308 days ago · 5 km deep · 92 km away
  19. 2.011 km SSE of Livermore, California · 15308 days ago · 5 km deep · 55 km away
  20. 1.511 km SE of Livermore, California · 15308 days ago · 5 km deep · 54 km away
  21. 3.314 km N of Morgan Hill, California · 15307 days ago · 6 km deep · 92 km away
  22. 3.114 km N of Morgan Hill, California · 15307 days ago · 6 km deep · 92 km away
  23. 1.65 km WSW of Temelec, California · 15305 days ago · 2 km deep · 63 km away
  24. 2.916 km N of Morgan Hill, California · 15305 days ago · 6 km deep · 90 km away
  25. 2.016 km E of Seven Trees, California · 15305 days ago · 6 km deep · 90 km away
  26. 1.616 km E of Seven Trees, California · 15304 days ago · 6 km deep · 90 km away
  27. 1.52 km E of San Leandro, California · 15303 days ago · 8 km deep · 45 km away
  28. 1.615 km NE of East Foothills, California · 15303 days ago · 7 km deep · 67 km away
  29. 1.62 km SSE of Crockett, California · 15302 days ago · 20 km deep · 29 km away
  30. 2.09 km ESE of East Foothills, California · 15302 days ago · 2 km deep · 81 km away
  31. 3.011 km NNE of Morgan Hill, California · 15300 days ago · 5 km deep · 95 km away
  32. 2.115 km N of Morgan Hill, California · 15300 days ago · 2 km deep · 91 km away
  33. 2.0Northern California · 15300 days ago · 7 km deep · 83 km away
  34. 2.616 km E of Seven Trees, California · 15295 days ago · 8 km deep · 89 km away
  35. 1.63 km NE of Seven Trees, California · 15295 days ago · 8 km deep · 84 km away
  36. 2.613 km ESE of Alum Rock, California · 15295 days ago · 7 km deep · 86 km away
  37. 1.69 km NNE of Morgan Hill, California · 15294 days ago · 4 km deep · 99 km away
  38. 2.09 km ENE of Seven Trees, California · 15294 days ago · 5 km deep · 85 km away
  39. 1.710 km ESE of East Foothills, California · 15293 days ago · 7 km deep · 82 km away
  40. 1.814 km E of Seven Trees, California · 15293 days ago · 3 km deep · 89 km away
  41. 1.58 km ENE of Santa Rosa, California · 15292 days ago · 12 km deep · 80 km away
  42. 2.412 km ESE of East Foothills, California · 15291 days ago · 7 km deep · 84 km away
  43. 1.912 km N of Morgan Hill, California · 15290 days ago · 6 km deep · 94 km away
  44. 1.713 km NNE of East Foothills, California · 15290 days ago · 8 km deep · 65 km away
  45. 1.514 km E of Seven Trees, California · 15288 days ago · 6 km deep · 86 km away
  46. 1.610 km ESE of East Foothills, California · 15288 days ago · 7 km deep · 82 km away
  47. 1.914 km E of Seven Trees, California · 15287 days ago · 5 km deep · 87 km away
  48. 2.49 km ENE of Hidden Valley Lake, California · 15286 days ago · 7 km deep · 98 km away
  49. 1.814 km ESE of East Foothills, California · 15285 days ago · 1 km deep · 83 km away
  50. 2.215 km N of Morgan Hill, California · 15284 days ago · 6 km deep · 91 km away
  51. 1.56 km ENE of East Foothills, California · 15282 days ago · 6 km deep · 75 km away
  52. 1.615 km NNE of Morgan Hill, California · 15282 days ago · 1 km deep · 93 km away
  53. 3.215 km E of Seven Trees, California · 15282 days ago · 6 km deep · 89 km away
  54. 1.815 km E of Seven Trees, California · 15279 days ago · 5 km deep · 89 km away
  55. 1.912 km ESE of East Foothills, California · 15279 days ago · 5 km deep · 84 km away
  56. 1.812 km ENE of Rutherford, California · 15279 days ago · 7 km deep · 63 km away
  57. 2.416 km WSW of Diablo Grande, California · 15278 days ago · 3 km deep · 87 km away
  58. 1.816 km E of Seven Trees, California · 15278 days ago · 5 km deep · 89 km away
  59. 2.216 km E of Seven Trees, California · 15278 days ago · 6 km deep · 89 km away
  60. 3.316 km E of Seven Trees, California · 15278 days ago · 6 km deep · 89 km away

The first 60 of 103.

Before

  1. 2.717 km N of Morgan Hill, California · 15314 days ago · 4 km deep · 90 km away
  2. 1.96 km N of Kenwood, California · 15315 days ago · 7 km deep · 74 km away
  3. 2.811 km ESE of East Foothills, California · 15316 days ago · 7 km deep · 83 km away
  4. 2.07 km ENE of Winters, California · 15317 days ago · 12 km deep · 54 km away
  5. 1.82 km ESE of Berkeley, California · 15318 days ago · 5 km deep · 40 km away
  6. 2.23 km NNW of Larkfield-Wikiup, California · 15318 days ago · 6 km deep · 94 km away
  7. 1.69 km ESE of East Foothills, California · 15319 days ago · 8 km deep · 81 km away
  8. 2.48 km ESE of East Foothills, California · 15319 days ago · 8 km deep · 80 km away
  9. 1.75 km ENE of Santa Rosa, California · 15320 days ago · 10 km deep · 81 km away
  10. 2.618 km ESE of East Foothills, California · 15321 days ago · 6 km deep · 86 km away
  11. 2.311 km SSE of Livermore, California · 15321 days ago · 5 km deep · 55 km away
  12. 2.013 km NNW of Moskowite Corner, California · 15321 days ago · 3 km deep · 63 km away
  13. 1.99 km N of Boulder Creek, California · 15321 days ago · 11 km deep · 98 km away
  14. 1.711 km ESE of East Foothills, California · 15321 days ago · 7 km deep · 83 km away
  15. 2.19 km ESE of East Foothills, California · 15322 days ago · 5 km deep · 81 km away
  16. 2.413 km ESE of Alum Rock, California · 15323 days ago · 7 km deep · 85 km away
  17. 2.02 km W of Dublin, California · 15325 days ago · 9 km deep · 42 km away
  18. 1.616 km N of Morgan Hill, California · 15326 days ago · 5 km deep · 90 km away
  19. 2.412 km E of Blackhawk, California · 15326 days ago · 13 km deep · 30 km away
  20. 1.89 km ESE of East Foothills, California · 15326 days ago · 6 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc30821. Read Thu, Oct 1, 2026, 4:39 PM UTC.