California earthquakes

M2.1 earthquake 13km ESE of Redway, CA

A magnitude 2.1 earthquake struck 13km ESE of Redway, CA on Wed, Aug 18, 2021, 6:04 AM PDT (13:04 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M4.5 10km SW of Petrolia, 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
2.1 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-08-18 13:04:52 UTC
Depth
22.2 km (13.8 mi), shallow
Epicenter
40.078° N, 123.686° 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, 0.5 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
97°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 84 in the 60 days after this one and 140 in the 30 days before it.

After

  1. 2.58km W of Petrolia, CA · 1871 days ago · 28 km deep · 65 km away
  2. 2.112km WNW of Alder Springs, CA · 1871 days ago · 3 km deep · 83 km away
  3. 3.16km W of Petrolia, CA · 1870 days ago · 28 km deep · 62 km away · felt by 1
  4. 1.620km W of Petrolia, CA · 1869 days ago · 15 km deep · 77 km away
  5. 1.87km W of Petrolia, CA · 1869 days ago · 29 km deep · 64 km away
  6. 1.813km W of Alder Springs, CA · 1867 days ago · 2 km deep · 83 km away · felt by 1
  7. 2.44km W of Petrolia, CA · 1866 days ago · 27 km deep · 62 km away
  8. 1.67km NNW of Laytonville, CA · 1865 days ago · 8 km deep · 40 km away
  9. 1.712km SSW of Ferndale, CA · 1864 days ago · 18 km deep · 70 km away
  10. 1.712km SSW of Ferndale, CA · 1864 days ago · 18 km deep · 70 km away
  11. 2.432km W of Hayfork, CA · 1862 days ago · 24 km deep · 60 km away
  12. 2.440km N of Covelo, CA · 1862 days ago · 37 km deep · 46 km away
  13. 1.69km E of Willits, CA · 1862 days ago · 8 km deep · 84 km away
  14. 1.714km NNE of Brooktrails, CA · 1861 days ago · 9 km deep · 64 km away
  15. 2.422km NW of Petrolia, CA · 1861 days ago · 19 km deep · 79 km away
  16. 4.011km WSW of Petrolia, CA · 1860 days ago · 32 km deep · 65 km away · felt by 8
  17. 3.511km WSW of Petrolia, CA · 1860 days ago · 28 km deep · 64 km away
  18. 1.819km NNW of Laytonville, CA · 1858 days ago · 7 km deep · 28 km away
  19. 2.48km W of Petrolia, CA · 1857 days ago · 17 km deep · 65 km away
  20. 2.811km NE of Covelo, CA · 1857 days ago · 6 km deep · 50 km away
  21. 2.315km W of Weaverville, CA · 1857 days ago · 39 km deep · 87 km away
  22. 1.813km WNW of Alder Springs, CA · 1856 days ago · 3 km deep · 82 km away
  23. 2.37km W of Petrolia, CA · 1856 days ago · 28 km deep · 64 km away
  24. 1.513km N of Brooktrails, CA · 1856 days ago · 8 km deep · 63 km away
  25. 1.86km W of Petrolia, CA · 1856 days ago · 28 km deep · 63 km away
  26. 1.96km WSW of Petrolia, CA · 1856 days ago · 28 km deep · 63 km away
  27. 2.58km WSW of Petrolia, CA · 1854 days ago · 29 km deep · 62 km away
  28. 1.80km SW of Laytonville, CA · 1854 days ago · 5 km deep · 47 km away
  29. 2.536km W of Petrolia, CA · 1853 days ago · 18 km deep · 92 km away
  30. 1.97km NW of Laytonville, CA · 1852 days ago · 8 km deep · 40 km away
  31. 1.87km ENE of Brooktrails, CA · 1852 days ago · 6 km deep · 75 km away
  32. 1.59km WSW of Petrolia, CA · 1850 days ago · 21 km deep · 62 km away
  33. 4.510km SW of Petrolia, CA · 1850 days ago · 33 km deep · 63 km away · felt by 39
  34. 2.28km WSW of Petrolia, CA · 1850 days ago · 31 km deep · 63 km away
  35. 1.612km ENE of Hydesville, CA · 1850 days ago · 25 km deep · 64 km away
  36. 2.48km WSW of Petrolia, CA · 1850 days ago · 29 km deep · 64 km away
  37. 2.433km WNW of Petrolia, CA · 1849 days ago · 22 km deep · 90 km away
  38. 2.422km N of Laytonville, CA · 1849 days ago · 6 km deep · 26 km away · felt by 1
  39. 2.38km NW of Laytonville, CA · 1849 days ago · 8 km deep · 39 km away
  40. 1.714km W of Redwood Valley, CA · 1848 days ago · 5 km deep · 93 km away
  41. 1.58km NNW of Laytonville, CA · 1848 days ago · 10 km deep · 39 km away
  42. 2.58km SW of Petrolia, CA · 1848 days ago · 31 km deep · 62 km away
  43. 2.325km WSW of Petrolia, CA · 1847 days ago · 21 km deep · 77 km away · felt by 1
  44. 1.710km NNW of Redwood Valley, CA · 1847 days ago · 8 km deep · 90 km away
  45. 1.612km SE of Petrolia, CA · 1846 days ago · 11 km deep · 46 km away
  46. 2.68km WSW of Petrolia, CA · 1844 days ago · 30 km deep · 63 km away · felt by 1
  47. 1.510km W of Redwood Valley, CA · 1843 days ago · 5 km deep · 95 km away
  48. 1.614km NNE of Brooktrails, CA · 1843 days ago · 8 km deep · 64 km away
  49. 3.06km SSW of Petrolia, CA · 1842 days ago · 20 km deep · 59 km away · felt by 7
  50. 1.913km W of Alder Springs, CA · 1842 days ago · 0 km deep · 83 km away
  51. 2.08km WSW of Petrolia, CA · 1838 days ago · 29 km deep · 64 km away
  52. 2.510km W of Petrolia, CA · 1838 days ago · 28 km deep · 66 km away
  53. 2.517km WSW of Petrolia, CA · 1837 days ago · 21 km deep · 71 km away
  54. 2.16km SW of Laytonville, CA · 1836 days ago · 3 km deep · 50 km away
  55. 2.57km WSW of Petrolia, CA · 1835 days ago · 21 km deep · 61 km away
  56. 2.021km WSW of Petrolia, CA · 1834 days ago · 20 km deep · 75 km away
  57. 2.322km N of Lake Pillsbury, CA · 1834 days ago · 13 km deep · 79 km away · felt by 2
  58. 3.613km SE of Petrolia, CA · 1834 days ago · 12 km deep · 45 km away · felt by 12
  59. 1.917km W of Humboldt Hill, CA · 1834 days ago · 21 km deep · 92 km away
  60. 2.713km SE of Petrolia, CA · 1832 days ago · 12 km deep · 45 km away

The first 60 of 84.

Before

  1. 1.88km NNW of Redwood Valley, CA · 1873 days ago · 1 km deep · 91 km away
  2. 1.816km W of Petrolia, CA · 1875 days ago · 11 km deep · 71 km away
  3. 1.610km N of Lake Pillsbury, CA · 1875 days ago · 7 km deep · 91 km away · felt by 1
  4. 2.910km N of Lake Pillsbury, CA · 1875 days ago · 10 km deep · 90 km away · felt by 1
  5. 2.036km WNW of Petrolia, CA · 1876 days ago · 8 km deep · 93 km away
  6. 2.111km W of Alder Springs, CA · 1876 days ago · 3 km deep · 84 km away
  7. 1.710km SSE of Laytonville, CA · 1876 days ago · 6 km deep · 56 km away
  8. 2.112km W of Alder Springs, CA · 1877 days ago · 8 km deep · 84 km away
  9. 2.28km WSW of Petrolia, CA · 1877 days ago · 29 km deep · 64 km away
  10. 1.910km NW of Petrolia, CA · 1877 days ago · 23 km deep · 67 km away
  11. 2.710km WNW of Alder Springs, CA · 1878 days ago · 3 km deep · 85 km away · felt by 1
  12. 2.66km WSW of Petrolia, CA · 1878 days ago · 30 km deep · 63 km away · felt by 1
  13. 2.910km WSW of Petrolia, CA · 1879 days ago · 31 km deep · 64 km away · felt by 1
  14. 1.912km NNW of Laytonville, CA · 1879 days ago · 8 km deep · 35 km away
  15. 1.811km WSW of Petrolia, CA · 1879 days ago · 29 km deep · 64 km away
  16. 1.76km E of Willits, CA · 1880 days ago · 6 km deep · 82 km away
  17. 1.710km N of Lake Pillsbury, CA · 1881 days ago · 8 km deep · 91 km away
  18. 2.98km W of Petrolia, CA · 1881 days ago · 30 km deep · 65 km away
  19. 2.08km W of Petrolia, CA · 1882 days ago · 28 km deep · 65 km away
  20. 2.012km W of Alder Springs, CA · 1882 days ago · 7 km deep · 84 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73611556. Read Sun, Oct 4, 2026, 4:48 AM UTC.