California earthquakes

M3.1 earthquake 11 km E of Blackhawk, California

A magnitude 3.1 earthquake struck 11 km E of Blackhawk, California on Mon, Mar 29, 1982, 5:24 PM PST (01:24 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M3.7 8 km ENE of Gilroy, California. This one was a foreshock.

Blackhawk 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
3.1 (md), minor
Local time
UTC
1982-03-30 01:24:15 UTC
Depth
17.3 km (10.8 mi), shallow
Epicenter
37.840° N, 121.776° 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, 0.3 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
161°
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 72 in the 60 days after this one and 55 in the 30 days before it.

After

  1. 3.111 km SW of Brentwood, California · 16256 days ago · 18 km deep · 1 km away
  2. 2.011 km ENE of Blackhawk, California · 16256 days ago · 18 km deep · 1 km away
  3. 2.12 km NE of Piedmont, California · 16255 days ago · 11 km deep · 38 km away
  4. 1.611 km SW of Brentwood, California · 16255 days ago · 19 km deep · 2 km away
  5. 2.03 km E of Discovery Bay, California · 16255 days ago · 3 km deep · 20 km away
  6. 2.39 km ESE of East Foothills, California · 16254 days ago · 7 km deep · 55 km away
  7. 2.42 km ESE of Piedmont, California · 16253 days ago · 4 km deep · 37 km away
  8. 1.96 km WSW of Gilroy, California · 16253 days ago · 6 km deep · 96 km away
  9. 1.66 km E of East Foothills, California · 16253 days ago · 5 km deep · 52 km away
  10. 1.52 km WNW of San Jose, California · 16252 days ago · 12 km deep · 56 km away
  11. 2.61 km ENE of San Ramon, California · 16251 days ago · 8 km deep · 17 km away
  12. 1.61 km ENE of San Ramon, California · 16251 days ago · 8 km deep · 18 km away
  13. 2.73 km ESE of Piedmont, California · 16251 days ago · 4 km deep · 37 km away
  14. 1.91 km E of San Ramon, California · 16251 days ago · 7 km deep · 18 km away
  15. 1.75 km ENE of Rohnert Park, California · 16249 days ago · 7 km deep · 94 km away
  16. 1.52 km E of San Ramon, California · 16249 days ago · 7 km deep · 17 km away
  17. 1.54 km E of Fremont, California · 16247 days ago · 6 km deep · 35 km away
  18. 2.316 km E of East Foothills, California · 16247 days ago · 6 km deep · 52 km away
  19. 1.716 km E of East Foothills, California · 16247 days ago · 6 km deep · 53 km away
  20. 2.09 km NNE of Milpitas, California · 16245 days ago · 9 km deep · 38 km away
  21. 2.19 km NE of Milpitas, California · 16245 days ago · 10 km deep · 38 km away
  22. 2.34 km E of Union City, California · 16245 days ago · 9 km deep · 33 km away
  23. 1.69 km NNE of Milpitas, California · 16245 days ago · 10 km deep · 38 km away
  24. 1.99 km NNE of Milpitas, California · 16245 days ago · 9 km deep · 38 km away
  25. 2.79 km ENE of Gilroy, California · 16244 days ago · 9 km deep · 92 km away
  26. 2.96 km E of East Foothills, California · 16243 days ago · 7 km deep · 50 km away
  27. 1.76 km ENE of East Foothills, California · 16243 days ago · 9 km deep · 48 km away
  28. 1.912 km ESE of Livermore, California · 16243 days ago · 7 km deep · 26 km away
  29. 2.69 km ENE of Gilroy, California · 16243 days ago · 9 km deep · 93 km away
  30. 2.88 km ENE of Patterson, California · 16242 days ago · 12 km deep · 76 km away
  31. 2.310 km SW of Brentwood, California · 16241 days ago · 13 km deep · 2 km away
  32. 1.75 km SSW of Gilroy, California · 16241 days ago · 5 km deep · 99 km away
  33. 2.122 km WNW of Diablo Grande, California · 16240 days ago · 6 km deep · 49 km away
  34. 1.89 km ESE of Black Point-Green Point, California · 16239 days ago · 8 km deep · 62 km away
  35. 2.23 km E of Napa, California · 16238 days ago · 3 km deep · 66 km away
  36. 2.32 km N of Kensington, California · 16236 days ago · 9 km deep · 46 km away
  37. 2.24 km N of Port Costa, California · 16234 days ago · 2 km deep · 45 km away
  38. 1.910 km SE of Livermore, California · 16233 days ago · 10 km deep · 26 km away
  39. 1.56 km NNE of East Foothills, California · 16232 days ago · 5 km deep · 45 km away
  40. 1.816 km E of East Foothills, California · 16232 days ago · 8 km deep · 52 km away
  41. 2.917 km E of East Foothills, California · 16231 days ago · 7 km deep · 52 km away
  42. 3.16 km NE of East Foothills, California · 16230 days ago · 8 km deep · 48 km away
  43. 1.96 km ENE of East Foothills, California · 16230 days ago · 9 km deep · 48 km away
  44. 1.93 km SW of Los Altos Hills, California · 16227 days ago · 8 km deep · 64 km away
  45. 1.63 km E of Interlaken, California · 16227 days ago · 6 km deep · 99 km away
  46. 2.96 km NNE of Interlaken, California · 16226 days ago · 11 km deep · 93 km away
  47. 2.61 km NNW of Rollingwood, California · 16225 days ago · 7 km deep · 52 km away
  48. 3.18 km ENE of Gilroy, California · 16222 days ago · 7 km deep · 93 km away
  49. 1.80 km S of Saint Helena, California · 16222 days ago · 8 km deep · 95 km away
  50. 1.58 km ENE of Morgan Hill, California · 16222 days ago · 4 km deep · 76 km away
  51. 2.65 km E of Penngrove, California · 16219 days ago · 6 km deep · 89 km away
  52. 1.78 km NNE of Milpitas, California · 16218 days ago · 3 km deep · 39 km away
  53. 1.64 km NW of Montalvin, California · 16218 days ago · 9 km deep · 56 km away
  54. 1.77 km NW of Broadmoor, California · 16215 days ago · 5 km deep · 68 km away
  55. 2.86km ESE of Garden Acres, CA · 16214 days ago · 6 km deep · 54 km away
  56. 2.53 km N of Piedmont, California · 16213 days ago · 6 km deep · 40 km away
  57. 1.67 km WSW of Gilroy, California · 16210 days ago · 5 km deep · 95 km away
  58. 1.64 km SE of Lexington Hills, California · 16210 days ago · 12 km deep · 79 km away
  59. 1.713 km SSW of Tracy, California · 16210 days ago · 7 km deep · 35 km away
  60. 2.79 km E of San Martin, California · 16209 days ago · 9 km deep · 88 km away

The first 60 of 72.

Before

  1. 2.33 km ESE of Piedmont, California · 16257 days ago · 4 km deep · 37 km away
  2. 3.13 km ESE of Piedmont, California · 16257 days ago · 4 km deep · 37 km away
  3. 2.22 km E of San Ramon, California · 16258 days ago · 7 km deep · 17 km away
  4. 1.92 km ESE of Piedmont, California · 16258 days ago · 6 km deep · 37 km away
  5. 1.53 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 37 km away
  6. 1.73 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 37 km away
  7. 1.92 km ESE of Piedmont, California · 16259 days ago · 3 km deep · 38 km away
  8. 2.73 km ESE of Piedmont, California · 16259 days ago · 5 km deep · 37 km away
  9. 2.73 km ESE of Piedmont, California · 16259 days ago · 4 km deep · 37 km away
  10. 2.75 km N of Morgan Hill, California · 16259 days ago · 6 km deep · 74 km away
  11. 1.94 km E of Piedmont, California · 16259 days ago · 4 km deep · 36 km away
  12. 3.03 km ESE of Piedmont, California · 16259 days ago · 5 km deep · 37 km away
  13. 2.64 km NE of Interlaken, California · 16259 days ago · 7 km deep · 96 km away
  14. 2.54 km NE of Interlaken, California · 16259 days ago · 7 km deep · 96 km away
  15. 1.62 km E of San Ramon, California · 16260 days ago · 7 km deep · 17 km away
  16. 1.92 km E of San Ramon, California · 16262 days ago · 8 km deep · 17 km away
  17. 2.11 km E of San Ramon, California · 16262 days ago · 7 km deep · 17 km away
  18. 2.11 km E of San Ramon, California · 16262 days ago · 5 km deep · 17 km away
  19. 1.61 km E of San Ramon, California · 16262 days ago · 7 km deep · 17 km away
  20. 2.117 km NE of East Foothills, California · 16262 days ago · 7 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1073348. Read Wed, Sep 30, 2026, 7:19 PM UTC.