California earthquakes

M2.1 earthquake 4km ESE of Acton, CA

A magnitude 2.1 earthquake struck 4km ESE of Acton, CA on Wed, Jan 17, 1973, 7:19 PM PST (03:19 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.4 6km W of Mira Loma, CA. This one was a foreshock.

Acton 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
2.1 (mh), micro
Local time
UTC
1973-01-18 03:19:21 UTC
Depth
7.1 km (4.4 mi), shallow
Epicenter
34.453° N, 118.161° 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 3.2 km horizontally, 2.6 km in depth
Magnitude uncertainty
±0.27
Depth from
From location
Station coverage gap
230°, poorly surrounded by stations
Stations used
4

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 120 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 2.46km W of Mira Loma, CA · 19605 days ago · 3 km deep · 74 km away
  2. 1.78km WNW of Agua Dulce, CA · 19603 days ago · 6 km deep · 24 km away
  3. 1.72km ESE of Ontario, CA · 19602 days ago · 6 km deep · 68 km away
  4. 1.75km NNE of Rancho Cucamonga, CA · 19601 days ago · 6 km deep · 63 km away
  5. 1.73km NNW of Colton, CA · 19601 days ago · 6 km deep · 86 km away
  6. 2.24km SE of Chino, CA · 19600 days ago · 0 km deep · 70 km away
  7. 2.36km ESE of Chino, CA · 19600 days ago · 0 km deep · 71 km away
  8. 1.74km NNE of Fontana, CA · 19600 days ago · 5 km deep · 75 km away
  9. 1.78km NNE of Sunland, CA · 19598 days ago · 6 km deep · 17 km away
  10. 1.72km SE of Ontario, CA · 19598 days ago · 6 km deep · 69 km away
  11. 1.72km NNW of Valencia, CA · 19596 days ago · 6 km deep · 39 km away
  12. 1.76km W of Agua Dulce, CA · 19596 days ago · 8 km deep · 22 km away
  13. 1.78km E of Santa Clarita, CA · 19596 days ago · 11 km deep · 24 km away
  14. 1.78km WSW of Agua Dulce, CA · 19596 days ago · 11 km deep · 23 km away
  15. 1.74km SSW of Santa Clarita, CA · 19596 days ago · 6 km deep · 34 km away
  16. 3.56km ESE of Santa Clarita, CA · 19596 days ago · 14 km deep · 27 km away
  17. 3.35km SSE of Santa Clarita, CA · 19596 days ago · 10 km deep · 32 km away
  18. 1.74km ESE of Santa Clarita, CA · 19596 days ago · 13 km deep · 28 km away
  19. 1.76km W of Agua Dulce, CA · 19596 days ago · 6 km deep · 21 km away
  20. 1.76km W of Agua Dulce, CA · 19596 days ago · 7 km deep · 22 km away
  21. 1.76km W of Agua Dulce, CA · 19596 days ago · 6 km deep · 22 km away
  22. 1.77km W of Agua Dulce, CA · 19596 days ago · 7 km deep · 23 km away
  23. 1.77km ENE of Santa Clarita, CA · 19595 days ago · 12 km deep · 25 km away
  24. 1.76km NNE of Fontana, CA · 19595 days ago · 6 km deep · 74 km away
  25. 2.48km NNW of Chatsworth, CA · 19595 days ago · 6 km deep · 45 km away
  26. 1.74km WSW of Bloomington, CA · 19595 days ago · 10 km deep · 79 km away
  27. 1.75km NNE of Fontana, CA · 19595 days ago · 6 km deep · 74 km away
  28. 2.416km W of Rancho Palos Verdes, CA · 19595 days ago · 6 km deep · 89 km away
  29. 1.712km N of Lake View Terrace, CA · 19594 days ago · 6 km deep · 21 km away
  30. 1.72km WSW of La Canada Flintridge, CA · 19594 days ago · 6 km deep · 29 km away
  31. 1.74km SE of Ontario, CA · 19592 days ago · 6 km deep · 70 km away
  32. 1.73km NNE of Sunland, CA · 19592 days ago · 6 km deep · 23 km away
  33. 1.72km N of Mira Loma, CA · 19592 days ago · 15 km deep · 77 km away
  34. 1.810km SSW of Agua Dulce, CA · 19592 days ago · 7 km deep · 19 km away
  35. 2.019km N of Bradbury, CA · 19591 days ago · 20 km deep · 26 km away
  36. 2.74km WSW of Fontana, CA · 19591 days ago · 4 km deep · 73 km away
  37. 1.712km S of Agua Dulce, CA · 19588 days ago · 8 km deep · 19 km away
  38. 1.73km ENE of Lake View Terrace, CA · 19588 days ago · 6 km deep · 24 km away
  39. 3.212km N of Lake View Terrace, CA · 19588 days ago · 9 km deep · 19 km away
  40. 1.712km S of Neenach, CA · 19588 days ago · 6 km deep · 49 km away
  41. 3.112km N of Lake View Terrace, CA · 19587 days ago · 10 km deep · 21 km away
  42. 1.713km SW of Acton, CA · 19587 days ago · 6 km deep · 14 km away
  43. 1.712km SSW of Agua Dulce, CA · 19587 days ago · 6 km deep · 20 km away
  44. 1.79km E of Santa Clarita, CA · 19587 days ago · 10 km deep · 23 km away
  45. 1.79km SSW of Agua Dulce, CA · 19587 days ago · 7 km deep · 19 km away
  46. 1.72km SE of San Fernando, CA · 19587 days ago · 6 km deep · 32 km away
  47. 1.74km ESE of Ontario, CA · 19587 days ago · 6 km deep · 70 km away
  48. 1.75km NE of Hollywood, CA · 19587 days ago · 5 km deep · 37 km away
  49. 3.417km SSW of San Pedro, CA · 19586 days ago · 6 km deep · 98 km away
  50. 1.79km SW of Agua Dulce, CA · 19586 days ago · 9 km deep · 22 km away
  51. 1.78km SW of Agua Dulce, CA · 19586 days ago · 11 km deep · 20 km away
  52. 1.711km SSW of Acton, CA · 19585 days ago · 6 km deep · 11 km away
  53. 3.010km S of Malibu Beach, CA · 19584 days ago · 6 km deep · 75 km away
  54. 1.78km SSE of Agua Dulce, CA · 19584 days ago · 15 km deep · 13 km away
  55. 1.79km E of Santa Clarita, CA · 19584 days ago · 9 km deep · 23 km away
  56. 1.721km S of Malibu Beach, CA · 19582 days ago · 10 km deep · 81 km away
  57. 1.77km SW of Malibu Beach, CA · 19581 days ago · 14 km deep · 74 km away
  58. 1.78km SW of Agua Dulce, CA · 19581 days ago · 7 km deep · 22 km away
  59. 2.66km N of Granada Hills, CA · 19580 days ago · 0 km deep · 35 km away
  60. 2.820km NW of Tehachapi, CA · 19580 days ago · 6 km deep · 99 km away

The first 60 of 120.

Before

  1. 1.77km N of Fontana, CA · 19606 days ago · 6 km deep · 72 km away
  2. 1.710km E of Santa Clarita, CA · 19607 days ago · 10 km deep · 22 km away
  3. 2.23km NNW of Fontana, CA · 19607 days ago · 7 km deep · 74 km away
  4. 1.710km SW of Agua Dulce, CA · 19607 days ago · 9 km deep · 22 km away
  5. 1.79km NNW of Lake View Terrace, CA · 19608 days ago · 6 km deep · 23 km away
  6. 1.77km S of Vincent, CA · 19608 days ago · 6 km deep · 5 km away
  7. 2.48km SW of Agua Dulce, CA · 19609 days ago · 6 km deep · 21 km away
  8. 1.78km SE of Santa Clarita, CA · 19610 days ago · 9 km deep · 28 km away
  9. 1.71km WNW of Wrightwood, CA · 19610 days ago · 6 km deep · 48 km away
  10. 1.79km NNE of San Dimas, CA · 19610 days ago · 6 km deep · 47 km away
  11. 1.712km S of Wrightwood, CA · 19612 days ago · 6 km deep · 52 km away
  12. 1.74km SSE of Long Beach, CA · 19612 days ago · 6 km deep · 75 km away
  13. 1.73km SE of Ontario, CA · 19613 days ago · 6 km deep · 69 km away
  14. 1.75km WNW of Mira Loma, CA · 19613 days ago · 19 km deep · 73 km away
  15. 1.74km SSE of Ontario, CA · 19614 days ago · 6 km deep · 70 km away
  16. 1.72km S of South El Monte, CA · 19614 days ago · 2 km deep · 47 km away
  17. 1.711km N of Sunland, CA · 19614 days ago · 9 km deep · 17 km away
  18. 1.78km W of Lytle Creek, CA · 19615 days ago · 6 km deep · 57 km away
  19. 2.83km SE of Chino, CA · 19615 days ago · 0 km deep · 69 km away
  20. 2.217km S of Las Flores, CA · 19616 days ago · 6 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3320437. Read Tue, Sep 22, 2026, 9:58 AM UTC.