California earthquakes

M1.7 earthquake 33km ENE of Hydesville, CA

A magnitude 1.7 earthquake struck 33km ENE of Hydesville, CA on Wed, Jul 21, 2021, 6:25 AM PDT (13:25 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M4.5 10km SW of Petrolia, CA. This one was a foreshock.

Hydesville 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
1.7 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-07-21 13:25:23 UTC
Depth
26.3 km (16.4 mi), shallow
Epicenter
40.652° N, 123.736° 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, 0.9 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
80°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 73 in the 60 days after this one and 27 in the 30 days before it.

After

  1. 2.041km NE of Covelo, CA · 1899 days ago · 4 km deep · 97 km away
  2. 2.733km WNW of Petrolia, CA · 1899 days ago · 23 km deep · 82 km away
  3. 2.77km W of Petrolia, CA · 1899 days ago · 29 km deep · 65 km away · felt by 2
  4. 2.912km WSW of Petrolia, CA · 1897 days ago · 32 km deep · 71 km away · felt by 1
  5. 2.18km W of Petrolia, CA · 1897 days ago · 29 km deep · 65 km away
  6. 2.78km W of Petrolia, CA · 1896 days ago · 29 km deep · 66 km away
  7. 2.412km N of Laytonville, CA · 1896 days ago · 7 km deep · 98 km away
  8. 1.75km W of Petrolia, CA · 1896 days ago · 29 km deep · 63 km away
  9. 1.94km ESE of Redway, CA · 1895 days ago · 21 km deep · 61 km away
  10. 2.38km E of Willow Creek, CA · 1895 days ago · 27 km deep · 36 km away
  11. 2.89km W of Petrolia, CA · 1895 days ago · 28 km deep · 66 km away
  12. 2.56km N of Petrolia, CA · 1894 days ago · 27 km deep · 55 km away
  13. 2.321km W of Petrolia, CA · 1894 days ago · 18 km deep · 78 km away
  14. 3.07km W of Petrolia, CA · 1893 days ago · 29 km deep · 65 km away
  15. 2.547km W of Ferndale, CA · 1892 days ago · 24 km deep · 92 km away
  16. 1.86km W of Petrolia, CA · 1892 days ago · 28 km deep · 64 km away
  17. 1.941km NE of Covelo, CA · 1892 days ago · 4 km deep · 97 km away
  18. 2.020km WSW of Petrolia, CA · 1892 days ago · 18 km deep · 77 km away
  19. 1.910km SSE of Redway, CA · 1891 days ago · 17 km deep · 69 km away
  20. 1.79km WSW of Petrolia, CA · 1890 days ago · 8 km deep · 67 km away
  21. 2.818km W of Petrolia, CA · 1889 days ago · 33 km deep · 75 km away
  22. 2.49km W of Petrolia, CA · 1886 days ago · 29 km deep · 67 km away
  23. 2.66km ENE of Petrolia, CA · 1885 days ago · 29 km deep · 53 km away
  24. 1.718km NNW of Laytonville, CA · 1884 days ago · 5 km deep · 92 km away
  25. 2.35km W of Petrolia, CA · 1884 days ago · 27 km deep · 63 km away
  26. 1.79km W of Petrolia, CA · 1884 days ago · 10 km deep · 67 km away
  27. 2.06km WSW of Petrolia, CA · 1883 days ago · 31 km deep · 65 km away
  28. 1.714km SE of Petrolia, CA · 1883 days ago · 12 km deep · 59 km away
  29. 3.16km W of Petrolia, CA · 1883 days ago · 28 km deep · 64 km away · felt by 5
  30. 2.08km W of Petrolia, CA · 1882 days ago · 28 km deep · 64 km away
  31. 2.98km W of Petrolia, CA · 1881 days ago · 30 km deep · 65 km away
  32. 1.811km WSW of Petrolia, CA · 1879 days ago · 29 km deep · 70 km away
  33. 1.912km NNW of Laytonville, CA · 1879 days ago · 8 km deep · 97 km away
  34. 2.910km WSW of Petrolia, CA · 1879 days ago · 31 km deep · 68 km away · felt by 1
  35. 2.66km WSW of Petrolia, CA · 1878 days ago · 30 km deep · 65 km away · felt by 1
  36. 1.910km NW of Petrolia, CA · 1878 days ago · 23 km deep · 60 km away
  37. 2.28km WSW of Petrolia, CA · 1877 days ago · 29 km deep · 66 km away
  38. 2.036km WNW of Petrolia, CA · 1876 days ago · 8 km deep · 85 km away
  39. 1.816km W of Petrolia, CA · 1875 days ago · 11 km deep · 73 km away
  40. 2.113km ESE of Redway, CA · 1873 days ago · 22 km deep · 64 km away
  41. 2.58km W of Petrolia, CA · 1871 days ago · 28 km deep · 64 km away
  42. 3.16km W of Petrolia, CA · 1871 days ago · 28 km deep · 64 km away · felt by 1
  43. 1.620km W of Petrolia, CA · 1869 days ago · 15 km deep · 74 km away
  44. 1.87km W of Petrolia, CA · 1869 days ago · 29 km deep · 65 km away
  45. 2.44km W of Petrolia, CA · 1866 days ago · 27 km deep · 62 km away
  46. 1.712km SSW of Ferndale, CA · 1865 days ago · 18 km deep · 53 km away
  47. 1.712km SSW of Ferndale, CA · 1865 days ago · 18 km deep · 53 km away
  48. 2.432km W of Hayfork, CA · 1862 days ago · 24 km deep · 16 km away
  49. 2.440km N of Covelo, CA · 1862 days ago · 37 km deep · 75 km away
  50. 2.422km NW of Petrolia, CA · 1861 days ago · 19 km deep · 66 km away
  51. 4.011km WSW of Petrolia, CA · 1860 days ago · 32 km deep · 70 km away · felt by 8
  52. 3.511km WSW of Petrolia, CA · 1860 days ago · 28 km deep · 70 km away
  53. 1.819km NNW of Laytonville, CA · 1858 days ago · 7 km deep · 92 km away
  54. 2.48km W of Petrolia, CA · 1857 days ago · 17 km deep · 65 km away
  55. 2.811km NE of Covelo, CA · 1857 days ago · 6 km deep · 100 km away
  56. 2.315km W of Weaverville, CA · 1857 days ago · 39 km deep · 53 km away
  57. 2.37km W of Petrolia, CA · 1856 days ago · 28 km deep · 65 km away
  58. 1.86km W of Petrolia, CA · 1856 days ago · 28 km deep · 64 km away
  59. 1.96km WSW of Petrolia, CA · 1856 days ago · 28 km deep · 65 km away
  60. 2.58km WSW of Petrolia, CA · 1854 days ago · 29 km deep · 67 km away

The first 60 of 73.

Before

  1. 2.840km WNW of Petrolia, CA · 1901 days ago · 24 km deep · 87 km away
  2. 1.716km SW of Ferndale, CA · 1901 days ago · 25 km deep · 60 km away
  3. 4.312km WSW of Petrolia, CA · 1901 days ago · 35 km deep · 71 km away · felt by 25
  4. 2.519km SE of Bayside, CA · 1901 days ago · 25 km deep · 16 km away
  5. 1.69km SSE of Redway, CA · 1902 days ago · 19 km deep · 68 km away
  6. 2.14km SW of Petrolia, CA · 1904 days ago · 31 km deep · 63 km away
  7. 2.49km W of Petrolia, CA · 1904 days ago · 29 km deep · 66 km away · felt by 7
  8. 5.112km W of Petrolia, CA · 1904 days ago · 31 km deep · 69 km away · felt by 751
  9. 2.421km W of Petrolia, CA · 1907 days ago · 8 km deep · 77 km away
  10. 2.48km WSW of Petrolia, CA · 1909 days ago · 20 km deep · 67 km away
  11. 1.89km SSW of Ferndale, CA · 1910 days ago · 18 km deep · 50 km away
  12. 1.69km SSW of Ferndale, CA · 1910 days ago · 19 km deep · 50 km away
  13. 1.79km SSW of Ferndale, CA · 1910 days ago · 18 km deep · 50 km away
  14. 2.022km W of Petrolia, CA · 1912 days ago · 19 km deep · 79 km away
  15. 2.821km W of Petrolia, CA · 1912 days ago · 20 km deep · 78 km away
  16. 2.011km SSW of Ferndale, CA · 1915 days ago · 19 km deep · 52 km away
  17. 1.722km W of Petrolia, CA · 1918 days ago · 26 km deep · 76 km away
  18. 2.124km WNW of Weaverville, CA · 1918 days ago · 32 km deep · 46 km away · felt by 1
  19. 2.015km SW of Petrolia, CA · 1919 days ago · 7 km deep · 73 km away
  20. 2.311km SSW of Ferndale, CA · 1922 days ago · 19 km deep · 52 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73596871. Read Sun, Oct 4, 2026, 8:08 AM UTC.