California earthquakes

M1.9 earthquake 2 km NNW of Concord, California

A magnitude 1.9 earthquake struck 2 km NNW of Concord, California on Mon, May 11, 1987, 12:08 AM PDT (07:08 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M2.7 3 km ESE of Piedmont, California. This one was a foreshock.

Concord 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
1.9 (md), micro
Local time
UTC
1987-05-11 07:08:34 UTC
Depth
14.7 km (9.1 mi), shallow
Epicenter
37.994° N, 122.044° 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
±0.19
Depth from
From location
Station coverage gap
68°
Stations used
31

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 98 in the 60 days after this one and 29 in the 30 days before it.

After

  1. 2.73 km ESE of Piedmont, California · 14380 days ago · 4 km deep · 24 km away
  2. 1.613 km N of Morgan Hill, California · 14379 days ago · 3 km deep · 90 km away
  3. 1.75 km NNE of San Leandro, California · 14378 days ago · 6 km deep · 26 km away
  4. 2.54 km SW of Glen Ellen, California · 14378 days ago · 6 km deep · 59 km away
  5. 1.714 km ESE of Hidden Valley Lake, California · 14377 days ago · 1 km deep · 90 km away
  6. 2.14 km SW of Glen Ellen, California · 14377 days ago · 6 km deep · 59 km away
  7. 2.14 km SW of Glen Ellen, California · 14377 days ago · 6 km deep · 59 km away
  8. 2.87 km NNE of East Foothills, California · 14376 days ago · 7 km deep · 65 km away
  9. 1.812 km NE of East Foothills, California · 14376 days ago · 5 km deep · 64 km away
  10. 2.02 km SE of Larkfield-Wikiup, California · 14376 days ago · 4 km deep · 82 km away
  11. 2.613 km ENE of East Foothills, California · 14375 days ago · 7 km deep · 69 km away
  12. 2.20 km S of Clayton, California · 14375 days ago · 3 km deep · 12 km away
  13. 2.315 km SSE of Livermore, California · 14373 days ago · 4 km deep · 58 km away
  14. 2.114 km N of Morgan Hill, California · 14372 days ago · 3 km deep · 88 km away
  15. 1.52 km SSE of Calistoga, California · 14372 days ago · 2 km deep · 77 km away
  16. 1.64 km E of Union City, California · 14371 days ago · 7 km deep · 45 km away
  17. 1.814 km N of Morgan Hill, California · 14370 days ago · 6 km deep · 89 km away
  18. 1.73 km SW of Hillsborough, California · 14370 days ago · 9 km deep · 58 km away
  19. 1.5Northern California · 14370 days ago · 8 km deep · 98 km away
  20. 1.86 km SSE of Cottonwood, California · 14369 days ago · 0 km deep · 69 km away
  21. 1.618 km NE of East Foothills, California · 14369 days ago · 4 km deep · 62 km away
  22. 2.018 km NE of East Foothills, California · 14369 days ago · 4 km deep · 62 km away
  23. 1.816 km E of Seven Trees, California · 14368 days ago · 6 km deep · 86 km away
  24. 1.65 km N of Winters, California · 14368 days ago · 1 km deep · 65 km away
  25. 2.11 km NNW of Winters, California · 14368 days ago · 2 km deep · 61 km away
  26. 1.93 km SSW of Broadmoor, California · 14365 days ago · 8 km deep · 55 km away
  27. 1.514 km E of Seven Trees, California · 14365 days ago · 2 km deep · 84 km away
  28. 1.50 km NE of Pleasant Hill, California · 14365 days ago · 9 km deep · 5 km away
  29. 1.61 km NE of Pleasant Hill, California · 14365 days ago · 8 km deep · 4 km away
  30. 3.43 km N of San Leandro, California · 14365 days ago · 5 km deep · 28 km away
  31. 3.0Northern California · 14365 days ago · 5 km deep · 28 km away
  32. 2.43 km NNE of San Leandro, California · 14365 days ago · 5 km deep · 28 km away
  33. 2.23 km N of San Leandro, California · 14365 days ago · 4 km deep · 28 km away
  34. 2.53 km NNE of San Leandro, California · 14364 days ago · 5 km deep · 28 km away
  35. 1.94 km ESE of San Ramon, California · 14364 days ago · 3 km deep · 27 km away
  36. 2.34 km ESE of San Ramon, California · 14364 days ago · 7 km deep · 27 km away
  37. 1.68 km ESE of East Foothills, California · 14364 days ago · 2 km deep · 77 km away
  38. 2.04 km ESE of San Ramon, California · 14364 days ago · 7 km deep · 27 km away
  39. 1.612 km ESE of East Foothills, California · 14363 days ago · 5 km deep · 81 km away
  40. 1.81 km WNW of Concord, California · 14362 days ago · 12 km deep · 1 km away
  41. 2.62 km NNE of San Leandro, California · 14362 days ago · 4 km deep · 29 km away
  42. 1.814 km N of Morgan Hill, California · 14362 days ago · 5 km deep · 89 km away
  43. 1.619 km E of East Foothills, California · 14361 days ago · 5 km deep · 82 km away
  44. 2.63 km ENE of East Foothills, California · 14361 days ago · 1 km deep · 71 km away
  45. 1.614 km ENE of Angwin, California · 14360 days ago · -1 km deep · 73 km away
  46. 3.22 km NE of San Leandro, California · 14360 days ago · 4 km deep · 29 km away
  47. 2.82 km NNE of San Leandro, California · 14360 days ago · 4 km deep · 29 km away
  48. 1.616 km SSE of Livermore, California · 14359 days ago · 8 km deep · 58 km away
  49. 2.63 km NNE of San Leandro, California · 14357 days ago · 4 km deep · 29 km away
  50. 2.014 km E of Seven Trees, California · 14357 days ago · 4 km deep · 85 km away
  51. 1.814 km E of Seven Trees, California · 14357 days ago · 3 km deep · 85 km away
  52. 1.60 km NE of North Gate, California · 14356 days ago · 11 km deep · 10 km away
  53. 1.718 km NE of East Foothills, California · 14356 days ago · 7 km deep · 62 km away
  54. 1.514 km N of Morgan Hill, California · 14355 days ago · 6 km deep · 88 km away
  55. 1.86 km W of Glen Ellen, California · 14355 days ago · 2 km deep · 63 km away
  56. 2.713 km N of Morgan Hill, California · 14355 days ago · 6 km deep · 90 km away
  57. 2.22 km N of Ashland, California · 14352 days ago · 5 km deep · 32 km away
  58. 2.515 km E of Seven Trees, California · 14351 days ago · 6 km deep · 85 km away
  59. 2.814 km N of Morgan Hill, California · 14351 days ago · 6 km deep · 89 km away
  60. 1.6Northern California · 14350 days ago · 5 km deep · 38 km away

The first 60 of 98.

Before

  1. 4.04 km ESE of Piedmont, California · 14380 days ago · 4 km deep · 24 km away
  2. 1.614 km ESE of East Foothills, California · 14382 days ago · 1 km deep · 80 km away
  3. 1.77 km WSW of Calistoga, California · 14382 days ago · 0 km deep · 82 km away
  4. 1.89 km ESE of East Foothills, California · 14382 days ago · 1 km deep · 78 km away
  5. 1.90 km W of Walnut Creek, California · 14383 days ago · 5 km deep · 10 km away
  6. 1.613 km N of Morgan Hill, California · 14384 days ago · 3 km deep · 90 km away
  7. 2.30 km E of Walnut Creek, California · 14387 days ago · 5 km deep · 10 km away
  8. 2.38 km SSW of Calistoga, California · 14388 days ago · 6 km deep · 76 km away
  9. 1.815 km SSE of Livermore, California · 14388 days ago · 4 km deep · 58 km away
  10. 2.212 km NNE of Angwin, California · 14388 days ago · 8 km deep · 82 km away
  11. 1.714 km E of Seven Trees, California · 14389 days ago · 2 km deep · 84 km away
  12. 2.010 km WNW of Bolinas, California · 14389 days ago · 6 km deep · 65 km away
  13. 1.53 km SSW of Alamo, California · 14389 days ago · 12 km deep · 19 km away
  14. 1.75 km SE of Pleasanton, California · 14389 days ago · 6 km deep · 44 km away
  15. 2.05 km SE of Pleasanton, California · 14389 days ago · 6 km deep · 44 km away
  16. 1.77 km W of Kenwood, California · 14390 days ago · 6 km deep · 70 km away
  17. 1.714 km E of Seven Trees, California · 14390 days ago · 3 km deep · 84 km away
  18. 1.76 km WNW of Kenwood, California · 14390 days ago · 5 km deep · 70 km away
  19. 1.97 km WSW of Kenwood, California · 14391 days ago · 2 km deep · 67 km away
  20. 1.616 km SSE of Livermore, California · 14391 days ago · 3 km deep · 59 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc100190. Read Tue, Sep 22, 2026, 9:43 PM UTC.