California earthquakes

M1.7 earthquake 8km SSE of Redlands, CA

A magnitude 1.7 earthquake struck 8km SSE of Redlands, CA on Tue, Dec 21, 2021, 2:12 PM PST (22:12 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M4.0 5km WSW of Palomar Observatory, CA. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
1.7 (ML, local (Richter)), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
2021-12-21 22:12:25 UTC
Depth
10.9 km (6.7 mi), shallow
Epicenter
33.987° N, 117.165° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
42°
Stations used
79

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 139 in the 60 days after this one and 47 in the 30 days before it.

After

  1. 2.73km NW of Palomar Observatory, CA · 1748 days ago · 5 km deep · 73 km away · felt by 53
  2. 1.62km W of Devore, CA · 1747 days ago · 13 km deep · 36 km away
  3. 2.13km NW of Palomar Observatory, CA · 1747 days ago · 5 km deep · 73 km away
  4. 2.13km NW of Palomar Observatory, CA · 1747 days ago · 6 km deep · 73 km away
  5. 2.13km NNW of Palomar Observatory, CA · 1747 days ago · 6 km deep · 73 km away
  6. 1.76km E of Calimesa, CA · 1746 days ago · 17 km deep · 16 km away
  7. 1.77km SE of Valle Vista, CA · 1746 days ago · 15 km deep · 43 km away · felt by 1
  8. 1.88km NNW of Fontana, CA · 1746 days ago · 3 km deep · 36 km away · felt by 1
  9. 2.43km ENE of Lytle Creek, CA · 1746 days ago · 8 km deep · 42 km away · felt by 22
  10. 3.13km NW of Palomar Observatory, CA · 1746 days ago · 5 km deep · 73 km away · felt by 37
  11. 2.03km NW of Palomar Observatory, CA · 1746 days ago · 5 km deep · 73 km away
  12. 1.717km NNE of Indio, CA · 1746 days ago · 4 km deep · 94 km away
  13. 2.03km NW of Palomar Observatory, CA · 1746 days ago · 5 km deep · 73 km away
  14. 1.811km NNE of Banning, CA · 1745 days ago · 18 km deep · 30 km away
  15. 1.910km S of Big Bear City, CA · 1744 days ago · 7 km deep · 37 km away
  16. 1.53km NNW of Palomar Observatory, CA · 1743 days ago · 5 km deep · 73 km away
  17. 2.64km NW of Fontana, CA · 1741 days ago · 5 km deep · 33 km away · felt by 88
  18. 2.913km N of Indio, CA · 1741 days ago · 9 km deep · 91 km away · felt by 50
  19. 2.022km SSW of La Quinta, CA · 1741 days ago · 9 km deep · 88 km away
  20. 2.18km N of Big Bear City, CA · 1741 days ago · 7 km deep · 49 km away · felt by 1
  21. 2.03km NNW of Palomar Observatory, CA · 1739 days ago · 5 km deep · 73 km away · felt by 1
  22. 1.814km SE of Anza, CA · 1739 days ago · 10 km deep · 80 km away
  23. 1.910km W of Palomar Observatory, CA · 1739 days ago · 8 km deep · 72 km away
  24. 1.69km W of Palomar Observatory, CA · 1739 days ago · 6 km deep · 73 km away
  25. 2.010km E of Pala, CA · 1739 days ago · 7 km deep · 72 km away
  26. 2.59km N of Rancho Cucamonga, CA · 1739 days ago · 9 km deep · 46 km away · felt by 70
  27. 3.02km NW of Palomar Observatory, CA · 1738 days ago · 5 km deep · 73 km away · felt by 27
  28. 1.83km NNW of Palomar Observatory, CA · 1738 days ago · 5 km deep · 73 km away
  29. 2.62km NW of Palomar Observatory, CA · 1738 days ago · 5 km deep · 73 km away · felt by 2
  30. 1.93km NNW of Palomar Observatory, CA · 1738 days ago · 6 km deep · 73 km away
  31. 1.75km N of Cabazon, CA · 1738 days ago · 12 km deep · 36 km away
  32. 3.43km SW of Redlands, CA · 1738 days ago · 14 km deep · 7 km away · felt by 509
  33. 2.12km NNW of Palomar Observatory, CA · 1738 days ago · 5 km deep · 74 km away
  34. 1.63km W of Redlands, CA · 1738 days ago · 14 km deep · 8 km away
  35. 1.64km SE of Lytle Creek, CA · 1738 days ago · 10 km deep · 39 km away
  36. 1.614km SSE of Valle Vista, CA · 1737 days ago · 13 km deep · 50 km away
  37. 1.810km S of Idyllwild, CA · 1736 days ago · 15 km deep · 54 km away
  38. 2.410km SSW of Idyllwild, CA · 1736 days ago · 15 km deep · 54 km away
  39. 1.62km NNW of Palomar Observatory, CA · 1736 days ago · 5 km deep · 73 km away
  40. 1.81km WSW of Valle Vista, CA · 1735 days ago · 5 km deep · 36 km away
  41. 2.12km W of Rancho Cucamonga, CA · 1734 days ago · 12 km deep · 43 km away
  42. 1.716km S of San Clemente, CA · 1733 days ago · 11 km deep · 87 km away
  43. 1.64km WNW of Pomona, CA · 1731 days ago · 6 km deep · 59 km away
  44. 2.03km NW of Palomar Observatory, CA · 1730 days ago · 5 km deep · 73 km away
  45. 3.23km NW of Palomar Observatory, CA · 1730 days ago · 5 km deep · 73 km away · felt by 67
  46. 1.92km NNW of Palomar Observatory, CA · 1730 days ago · 6 km deep · 73 km away
  47. 2.13km NW of Palomar Observatory, CA · 1730 days ago · 5 km deep · 73 km away
  48. 2.22km NW of Palomar Observatory, CA · 1730 days ago · 5 km deep · 73 km away · felt by 1
  49. 1.610km NW of Anza, CA · 1729 days ago · 16 km deep · 56 km away
  50. 1.91km SE of Loma Linda, CA · 1726 days ago · 15 km deep · 10 km away · felt by 1
  51. 3.923km ESE of Anza, CA · 1726 days ago · 14 km deep · 88 km away · felt by 2,570
  52. 2.424km SSW of La Quinta, CA · 1726 days ago · 15 km deep · 89 km away · felt by 59
  53. 2.224km ESE of Anza, CA · 1726 days ago · 15 km deep · 88 km away
  54. 2.024km SSW of La Quinta, CA · 1726 days ago · 14 km deep · 88 km away
  55. 2.023km SSW of La Quinta, CA · 1726 days ago · 14 km deep · 88 km away · felt by 6
  56. 2.324km ESE of Anza, CA · 1726 days ago · 13 km deep · 88 km away · felt by 4
  57. 1.924km SSW of La Quinta, CA · 1726 days ago · 14 km deep · 88 km away
  58. 1.823km ESE of Anza, CA · 1726 days ago · 14 km deep · 88 km away · felt by 1
  59. 2.923km ESE of Anza, CA · 1726 days ago · 13 km deep · 88 km away · felt by 197
  60. 1.723km ESE of Anza, CA · 1726 days ago · 13 km deep · 88 km away

The first 60 of 139.

Before

  1. 2.13km NNW of Palomar Observatory, CA · 1748 days ago · 5 km deep · 73 km away
  2. 1.86km ESE of Valle Vista, CA · 1748 days ago · 16 km deep · 43 km away
  3. 1.97km ESE of Cabazon, CA · 1748 days ago · 16 km deep · 43 km away
  4. 1.85km WNW of Beaumont, CA · 1749 days ago · 15 km deep · 14 km away
  5. 1.64km N of Fontana, CA · 1749 days ago · 7 km deep · 32 km away
  6. 1.76km NNE of Lake Henshaw, CA · 1750 days ago · 12 km deep · 86 km away
  7. 2.54km SSE of Charter Oak, CA · 1750 days ago · 12 km deep · 62 km away · felt by 24
  8. 1.53km NNW of Palomar Observatory, CA · 1750 days ago · 5 km deep · 73 km away
  9. 1.85km SSW of Idyllwild, CA · 1751 days ago · 16 km deep · 50 km away
  10. 2.92km N of Yucaipa, CA · 1751 days ago · 11 km deep · 13 km away · felt by 37
  11. 2.25km ENE of Calimesa, CA · 1752 days ago · 16 km deep · 16 km away
  12. 1.623km ESE of Anza, CA · 1753 days ago · 13 km deep · 88 km away
  13. 1.63km WSW of Yucca Valley, CA · 1753 days ago · 12 km deep · 66 km away
  14. 2.33km SE of Lake Henshaw, CA · 1753 days ago · 11 km deep · 93 km away · felt by 5
  15. 2.32km SE of Orange, CA · 1755 days ago · 5 km deep · 64 km away · felt by 145
  16. 1.65km NNW of Fontana, CA · 1755 days ago · 6 km deep · 34 km away · felt by 4
  17. 1.79km SSW of Idyllwild, CA · 1756 days ago · 17 km deep · 51 km away
  18. 1.936km WSW of Ludlow, CA · 1756 days ago · 5 km deep · 88 km away
  19. 1.86km SSW of Redlands, CA · 1757 days ago · 16 km deep · 5 km away · felt by 1
  20. 1.68km WSW of Anza, CA · 1759 days ago · 3 km deep · 65 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci39892863. Read Sun, Oct 4, 2026, 7:08 PM UTC.