California earthquakes

M1.5 earthquake 10 km NE of Blackhawk, California

A magnitude 1.5 earthquake struck 10 km NE of Blackhawk, California on Sat, Sep 15, 1990, 2:44 PM PDT (21:44 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.6 2 km N of Scotts Valley, 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
1.5 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
1990-09-15 21:44:18 UTC
Depth
6.9 km (4.3 mi), shallow
Epicenter
37.887° N, 121.826° 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 0.6 km horizontally, 1.8 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
159°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 96 in the 60 days after this one and 64 in the 30 days before it.

After

  1. 2.117 km SSE of Livermore, California · 13166 days ago · 7 km deep · 40 km away
  2. 1.9Northern California · 13166 days ago · 13 km deep · 92 km away
  3. 2.16 km NE of East Foothills, California · 13165 days ago · 7 km deep · 52 km away
  4. 1.62 km E of North Gate, California · 13164 days ago · 8 km deep · 12 km away
  5. 2.38 km N of East Foothills, California · 13163 days ago · 6 km deep · 48 km away
  6. 2.06 km NE of East Foothills, California · 13162 days ago · 10 km deep · 51 km away
  7. 1.75 km NE of Amesti, California · 13162 days ago · 11 km deep · 99 km away
  8. 2.13 km E of Berkeley, California · 13160 days ago · 9 km deep · 36 km away
  9. 2.26 km E of East Foothills, California · 13160 days ago · 6 km deep · 56 km away
  10. 3.22 km SE of Ladera, California · 13160 days ago · 7 km deep · 64 km away
  11. 1.9Northern California · 13160 days ago · 15 km deep · 22 km away
  12. 2.014 km E of Seven Trees, California · 13159 days ago · 6 km deep · 67 km away
  13. 2.32 km SE of Ladera, California · 13157 days ago · 6 km deep · 64 km away
  14. 3.52 km SE of Ladera, California · 13157 days ago · 7 km deep · 64 km away
  15. 1.721 km SW of Diablo Grande, California · 13156 days ago · 7 km deep · 74 km away
  16. 1.72 km N of Scotts Valley, California · 13155 days ago · 10 km deep · 92 km away
  17. 1.52 km N of Scotts Valley, California · 13155 days ago · 10 km deep · 92 km away
  18. 1.92 km SE of Pittsburg, California · 13154 days ago · 20 km deep · 14 km away
  19. 1.52 km ESE of Zayante, California · 13153 days ago · 8 km deep · 91 km away
  20. 1.62 km N of Scotts Valley, California · 13153 days ago · 10 km deep · 92 km away
  21. 2.12 km N of Scotts Valley, California · 13153 days ago · 11 km deep · 92 km away
  22. 2.54 km S of Lexington Hills, California · 13152 days ago · 14 km deep · 86 km away
  23. 2.37 km NW of Day Valley, California · 13151 days ago · 10 km deep · 89 km away
  24. 1.62 km ENE of Alamo, California · 13150 days ago · 5 km deep · 16 km away
  25. 1.95 km NW of Day Valley, California · 13150 days ago · 15 km deep · 92 km away
  26. 2.51 km NE of Alamo, California · 13150 days ago · 5 km deep · 17 km away
  27. 3.62 km N of Scotts Valley, California · 13148 days ago · 12 km deep · 92 km away
  28. 2.42 km N of Scotts Valley, California · 13148 days ago · 11 km deep · 92 km away
  29. 1.62 km N of Scotts Valley, California · 13148 days ago · 10 km deep · 92 km away
  30. 1.62 km NNE of Scotts Valley, California · 13148 days ago · 10 km deep · 92 km away
  31. 2.01 km S of Lexington Hills, California · 13148 days ago · 9 km deep · 83 km away
  32. 1.86 km WSW of Saratoga, California · 13146 days ago · 7 km deep · 75 km away
  33. 2.916 km N of Morgan Hill, California · 13144 days ago · 8 km deep · 70 km away
  34. 1.716 km E of Seven Trees, California · 13144 days ago · 7 km deep · 69 km away
  35. 1.99 km SSE of Elmira, California · 13143 days ago · 5 km deep · 42 km away
  36. 3.212 km WSW of Byron, California · 13143 days ago · 16 km deep · 11 km away
  37. 1.512 km E of Blackhawk, California · 13143 days ago · 16 km deep · 11 km away
  38. 1.84 km ESE of Kenwood, California · 13142 days ago · 1 km deep · 82 km away
  39. 3.04 km NNW of Day Valley, California · 13140 days ago · 13 km deep · 91 km away
  40. 1.93 km E of San Leandro, California · 13140 days ago · 4 km deep · 31 km away
  41. 2.1Northern California · 13140 days ago · 4 km deep · 31 km away
  42. 3.50 km SW of Crockett, California · 13139 days ago · 12 km deep · 39 km away
  43. 2.31 km W of Crockett, California · 13139 days ago · 10 km deep · 39 km away
  44. 2.5Northern California · 13139 days ago · 11 km deep · 92 km away
  45. 1.86 km ENE of Santa Rosa, California · 13139 days ago · 1 km deep · 95 km away
  46. 1.9Northern California · 13137 days ago · 2 km deep · 96 km away
  47. 2.25 km ENE of Santa Rosa, California · 13137 days ago · 1 km deep · 96 km away
  48. 1.915 km E of Seven Trees, California · 13137 days ago · 5 km deep · 69 km away
  49. 2.16 km ENE of Santa Rosa, California · 13137 days ago · 1 km deep · 96 km away
  50. 2.08 km NNE of Gilroy, California · 13137 days ago · 4 km deep · 95 km away
  51. 1.915 km E of Seven Trees, California · 13136 days ago · 6 km deep · 68 km away
  52. 1.77 km S of Muir Beach, California · 13135 days ago · 11 km deep · 67 km away
  53. 3.0Northern California · 13134 days ago · 7 km deep · 46 km away
  54. 1.78 km ESE of Lexington Hills, California · 13134 days ago · 3 km deep · 85 km away
  55. 2.17 km ENE of Gilroy, California · 13134 days ago · 5 km deep · 99 km away
  56. 2.02 km WNW of Broadmoor, California · 13133 days ago · 8 km deep · 64 km away
  57. 1.511 km E of Blackhawk, California · 13133 days ago · 13 km deep · 10 km away
  58. 2.16 km NNE of Day Valley, California · 13132 days ago · 4 km deep · 88 km away
  59. 2.31 km SSW of Lexington Hills, California · 13131 days ago · 12 km deep · 83 km away
  60. 2.62 km WNW of Broadmoor, California · 13130 days ago · 8 km deep · 64 km away

The first 60 of 96.

Before

  1. 1.6Northern California · 13169 days ago · 6 km deep · 37 km away
  2. 1.64 km ENE of Saint Helena, California · 13170 days ago · 13 km deep · 87 km away
  3. 1.57 km SW of Monte Sereno, California · 13170 days ago · 13 km deep · 79 km away
  4. 1.616 km SE of Livermore, California · 13171 days ago · 7 km deep · 39 km away
  5. 1.79 km ESE of Lexington Hills, California · 13171 days ago · 2 km deep · 85 km away
  6. 1.810 km NE of Angwin, California · 13172 days ago · 4 km deep · 96 km away
  7. 1.94 km WNW of Day Valley, California · 13172 days ago · 16 km deep · 93 km away
  8. 1.83 km NNW of Diablo, California · 13173 days ago · 0 km deep · 13 km away
  9. 2.57 km ENE of Gilroy, California · 13173 days ago · 6 km deep · 100 km away
  10. 1.95 km SE of Sunol, California · 13174 days ago · 6 km deep · 37 km away
  11. 1.95 km SE of Sunol, California · 13174 days ago · 6 km deep · 37 km away
  12. 1.513 km NNW of Moskowite Corner, California · 13175 days ago · 5 km deep · 83 km away
  13. 2.25 km SE of Sunol, California · 13176 days ago · 6 km deep · 37 km away
  14. 2.5Northern California · 13176 days ago · 5 km deep · 60 km away
  15. 1.62 km SW of Bay Point, California · 13177 days ago · 7 km deep · 19 km away
  16. 2.26 km E of East Foothills, California · 13178 days ago · 9 km deep · 56 km away
  17. 1.67 km E of East Foothills, California · 13178 days ago · 9 km deep · 56 km away
  18. 1.87 km E of East Foothills, California · 13178 days ago · 9 km deep · 56 km away
  19. 1.72 km N of Seacliff, California · 13178 days ago · 4 km deep · 99 km away
  20. 1.82 km N of Seacliff, California · 13178 days ago · 4 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc164158. Read Sun, Oct 4, 2026, 3:05 AM UTC.