California earthquakes

M1.6 earthquake 9 km S of Antioch, California

A magnitude 1.6 earthquake struck 9 km S of Antioch, California on Sun, Jul 21, 2002, 8:12 AM PDT (15:12 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M3.0 1 km SE of Diablo, California. This one was a foreshock.

Antioch forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.6 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2002-07-21 15:12:36 UTC
Depth
18.3 km (11.4 mi), shallow
Epicenter
37.918° N, 121.810° 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 1.6 km horizontally, 1.0 km in depth
Magnitude uncertainty
±0.32
Depth from
From location
Station coverage gap
223°, poorly surrounded by stations
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 93 in the 60 days after this one and 58 in the 30 days before it.

After

  1. 2.58 km ENE of San Martin, California · 8842 days ago · 8 km deep · 92 km away
  2. 1.91 km NE of Montara, California · 8842 days ago · 5 km deep · 73 km away
  3. 1.61 km NE of Montara, California · 8842 days ago · 5 km deep · 73 km away
  4. 2.73 km N of East Foothills, California · 8842 days ago · 2 km deep · 56 km away
  5. 2.93 km N of East Foothills, California · 8842 days ago · 0 km deep · 56 km away
  6. 2.05 km NNE of Milpitas, California · 8840 days ago · 0 km deep · 50 km away
  7. 2.10 km E of Concord, California · 8840 days ago · 13 km deep · 20 km away
  8. 1.88 km SE of Knights Landing, California · 8839 days ago · 13 km deep · 94 km away
  9. 1.52 km NE of San Ramon, California · 8838 days ago · 7 km deep · 19 km away
  10. 1.72 km NE of San Ramon, California · 8837 days ago · 8 km deep · 19 km away
  11. 1.94 km SE of Piedmont, California · 8837 days ago · 12 km deep · 37 km away
  12. 1.77 km E of East Foothills, California · 8837 days ago · 5 km deep · 61 km away
  13. 1.81 km NE of San Ramon, California · 8837 days ago · 7 km deep · 19 km away
  14. 1.91 km NE of San Ramon, California · 8837 days ago · 7 km deep · 20 km away
  15. 1.71 km NE of San Ramon, California · 8836 days ago · 7 km deep · 19 km away
  16. 1.92 km NE of San Ramon, California · 8836 days ago · 7 km deep · 19 km away
  17. 1.72 km NE of San Ramon, California · 8836 days ago · 8 km deep · 19 km away
  18. 1.72 km NE of San Ramon, California · 8836 days ago · 7 km deep · 19 km away
  19. 1.62 km NE of San Ramon, California · 8836 days ago · 7 km deep · 19 km away
  20. 1.5Northern California · 8836 days ago · 6 km deep · 19 km away
  21. 1.75 km WSW of Broadmoor, California · 8836 days ago · 7 km deep · 70 km away
  22. 1.79 km ESE of Livermore, California · 8835 days ago · 1 km deep · 33 km away
  23. 1.65 km ESE of San Ramon, California · 8834 days ago · 7 km deep · 20 km away
  24. 1.73 km NNE of Day Valley, California · 8834 days ago · 15 km deep · 95 km away
  25. 1.54 km SSW of Ione, California · 8834 days ago · 1 km deep · 87 km away
  26. 1.88 km SSE of Knights Landing, California · 8833 days ago · 10 km deep · 91 km away
  27. 1.67 km E of East Foothills, California · 8832 days ago · 6 km deep · 61 km away
  28. 1.54 km WSW of Highlands-Baywood Park, California · 8832 days ago · 2 km deep · 69 km away
  29. 1.76 km S of Calistoga, California · 8830 days ago · 5 km deep · 96 km away
  30. 2.06 km NNE of Milpitas, California · 8830 days ago · 0 km deep · 49 km away
  31. 1.61 km NE of Pacifica, California · 8829 days ago · 7 km deep · 67 km away
  32. 1.615 km E of Seven Trees, California · 8826 days ago · 2 km deep · 71 km away
  33. 1.74 km S of Diablo Grande, California · 8826 days ago · 7 km deep · 78 km away
  34. 1.97 km E of East Foothills, California · 8825 days ago · 7 km deep · 61 km away
  35. 1.93 km N of East Foothills, California · 8824 days ago · 1 km deep · 56 km away
  36. 2.113 km E of Angwin, California · 8821 days ago · 1 km deep · 84 km away
  37. 1.75 km E of Alameda, California · 8819 days ago · 11 km deep · 37 km away
  38. 1.85 km NNE of Milpitas, California · 8819 days ago · 0 km deep · 50 km away
  39. 1.69 km S of Muir Beach, California · 8817 days ago · 9 km deep · 69 km away
  40. 2.66 km N of Pittsburg, California · 8816 days ago · 20 km deep · 20 km away
  41. 1.511 km SSE of Livermore, California · 8816 days ago · 6 km deep · 37 km away
  42. 2.02 km NNW of Benicia, California · 8816 days ago · 8 km deep · 36 km away
  43. 1.8Northern California · 8814 days ago · 8 km deep · 91 km away
  44. 1.812 km ESE of East Foothills, California · 8812 days ago · 5 km deep · 67 km away
  45. 2.01 km SSE of Diablo, California · 8811 days ago · 14 km deep · 17 km away
  46. 1.71 km S of Diablo, California · 8810 days ago · 16 km deep · 17 km away
  47. 2.48 km N of East Foothills, California · 8810 days ago · 6 km deep · 51 km away
  48. 1.62 km S of Diablo, California · 8810 days ago · 13 km deep · 17 km away
  49. 1.811 km ESE of East Foothills, California · 8810 days ago · 6 km deep · 66 km away
  50. 1.91 km SE of Diablo, California · 8810 days ago · 15 km deep · 16 km away
  51. 3.01 km SE of Diablo, California · 8810 days ago · 16 km deep · 16 km away
  52. 1.81 km SE of Pacifica, California · 8810 days ago · 9 km deep · 68 km away
  53. 1.68 km ENE of Morgan Hill, California · 8810 days ago · 3 km deep · 86 km away
  54. 2.51 km SE of Diablo, California · 8809 days ago · 16 km deep · 16 km away
  55. 1.62 km SE of Diablo, California · 8809 days ago · 14 km deep · 16 km away
  56. 1.96 km NNE of Milpitas, California · 8809 days ago · 1 km deep · 49 km away
  57. 2.514 km ESE of Livermore, California · 8808 days ago · 0 km deep · 37 km away
  58. 1.614 km ESE of Livermore, California · 8808 days ago · 0 km deep · 37 km away
  59. 2.11 km SW of Campbell, California · 8807 days ago · 7 km deep · 72 km away
  60. 1.91 km SSE of Diablo, California · 8807 days ago · 15 km deep · 17 km away

The first 60 of 93.

Before

  1. 1.56 km S of Calistoga, California · 8842 days ago · 8 km deep · 95 km away
  2. 2.43 km N of East Foothills, California · 8843 days ago · 0 km deep · 56 km away
  3. 2.73 km N of East Foothills, California · 8843 days ago · 2 km deep · 56 km away
  4. 1.616 km N of Morgan Hill, California · 8843 days ago · 6 km deep · 73 km away
  5. 1.64 km ENE of La Honda, California · 8845 days ago · 0 km deep · 75 km away
  6. 1.811 km SE of Knights Landing, California · 8845 days ago · 10 km deep · 91 km away
  7. 1.710 km SE of Knights Landing, California · 8845 days ago · 9 km deep · 91 km away
  8. 3.39 km SE of Knights Landing, California · 8845 days ago · 21 km deep · 92 km away
  9. 1.89 km SE of Knights Landing, California · 8845 days ago · 13 km deep · 93 km away
  10. 2.59 km SE of Knights Landing, California · 8845 days ago · 24 km deep · 93 km away
  11. 2.210 km ESE of Davis, California · 8845 days ago · 40 km deep · 67 km away
  12. 2.44 km ESE of Sunol, California · 8845 days ago · 5 km deep · 38 km away
  13. 1.715 km E of Seven Trees, California · 8846 days ago · 6 km deep · 71 km away
  14. 3.115 km E of Seven Trees, California · 8846 days ago · 6 km deep · 71 km away
  15. 1.56 km S of Calistoga, California · 8846 days ago · 6 km deep · 95 km away
  16. 1.63 km N of East Foothills, California · 8847 days ago · 1 km deep · 56 km away
  17. 1.76 km NNE of East Foothills, California · 8847 days ago · 6 km deep · 53 km away
  18. 1.63 km S of Sunol, California · 8847 days ago · 8 km deep · 40 km away
  19. 1.96 km E of East Foothills, California · 8848 days ago · 4 km deep · 59 km away
  20. 1.63 km N of East Foothills, California · 8848 days ago · 1 km deep · 56 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc21236613. Read Mon, Oct 5, 2026, 12:00 PM UTC.