California earthquakes

M1.8 earthquake 8km ENE of Petrolia, CA

A magnitude 1.8 earthquake struck 8km ENE of Petrolia, CA on Mon, Dec 20, 2021, 12:58 PM PST (20:58 UTC), 30 km (19 mi) below the surface.

A larger quake followed: M4.6 50km W of Petrolia, CA. This one was a foreshock.

Scotia 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-12-20 20:58:30 UTC
Depth
29.9 km (18.5 mi), shallow
Epicenter
40.354° N, 124.192° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.6 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
101°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 63 in the 30 days before it.

After

  1. 3.08km SSW of Rio Dell, CA · 1749 days ago · 27 km deep · 10 km away · felt by 1
  2. 2.213km N of Petrolia, CA · 1749 days ago · 23 km deep · 13 km away
  3. 3.114km NNE of Petrolia, CA · 1749 days ago · 28 km deep · 11 km away · felt by 3
  4. 2.813km WSW of Petrolia, CA · 1749 days ago · 22 km deep · 22 km away
  5. 2.914km SSW of Ferndale, CA · 1749 days ago · 26 km deep · 17 km away
  6. 2.57km NNE of Petrolia, CA · 1749 days ago · 24 km deep · 7 km away
  7. 2.514km N of Petrolia, CA · 1749 days ago · 29 km deep · 11 km away
  8. 2.38km SSW of Ferndale, CA · 1749 days ago · 19 km deep · 19 km away
  9. 2.412km S of Ferndale, CA · 1749 days ago · 25 km deep · 14 km away
  10. 3.313km SSW of Ferndale, CA · 1749 days ago · 24 km deep · 15 km away · felt by 7
  11. 2.614km N of Petrolia, CA · 1749 days ago · 27 km deep · 15 km away
  12. 2.715km SW of Ferndale, CA · 1749 days ago · 26 km deep · 20 km away
  13. 2.612km SSW of Ferndale, CA · 1749 days ago · 25 km deep · 16 km away
  14. 2.04km ENE of Petrolia, CA · 1749 days ago · 21 km deep · 5 km away
  15. 3.211km NNE of Petrolia, CA · 1749 days ago · 23 km deep · 8 km away · felt by 1
  16. 2.414km NNW of Petrolia, CA · 1749 days ago · 22 km deep · 15 km away
  17. 2.411km NNE of Petrolia, CA · 1749 days ago · 28 km deep · 8 km away
  18. 2.411km SSW of Ferndale, CA · 1749 days ago · 21 km deep · 18 km away
  19. 2.312km SW of Rio Dell, CA · 1749 days ago · 29 km deep · 9 km away
  20. 2.212km SSW of Ferndale, CA · 1749 days ago · 21 km deep · 18 km away
  21. 3.318km SW of Ferndale, CA · 1749 days ago · 25 km deep · 24 km away · felt by 2
  22. 3.96km NE of Petrolia, CA · 1749 days ago · 27 km deep · 3 km away · felt by 1
  23. 1.94km NNE of Petrolia, CA · 1749 days ago · 28 km deep · 6 km away
  24. 2.68km W of Petrolia, CA · 1749 days ago · 31 km deep · 15 km away · felt by 2
  25. 2.410km NNE of Petrolia, CA · 1749 days ago · 24 km deep · 8 km away
  26. 2.37km NNE of Petrolia, CA · 1749 days ago · 23 km deep · 7 km away · felt by 4
  27. 2.012km S of Ferndale, CA · 1749 days ago · 24 km deep · 14 km away
  28. 2.320km NNE of Redway, CA · 1749 days ago · 26 km deep · 37 km away · felt by 3
  29. 2.610km NNW of Petrolia, CA · 1749 days ago · 26 km deep · 12 km away
  30. 2.833km W of Petrolia, CA · 1749 days ago · 19 km deep · 41 km away
  31. 2.829km W of Petrolia, CA · 1749 days ago · 19 km deep · 37 km away · felt by 3
  32. 2.622km SW of Ferndale, CA · 1749 days ago · 27 km deep · 27 km away
  33. 2.011km NNE of Petrolia, CA · 1749 days ago · 28 km deep · 8 km away
  34. 2.512km SW of Rio Dell, CA · 1749 days ago · 28 km deep · 9 km away
  35. 2.47km NNW of Petrolia, CA · 1749 days ago · 26 km deep · 10 km away
  36. 2.621km W of Petrolia, CA · 1749 days ago · 21 km deep · 29 km away
  37. 1.920km SSE of Rio Dell, CA · 1749 days ago · 31 km deep · 13 km away
  38. 2.729km W of Petrolia, CA · 1749 days ago · 21 km deep · 37 km away · felt by 1
  39. 2.28km N of Petrolia, CA · 1749 days ago · 26 km deep · 8 km away
  40. 2.311km SSW of Ferndale, CA · 1749 days ago · 19 km deep · 17 km away
  41. 2.814km N of Petrolia, CA · 1749 days ago · 23 km deep · 14 km away
  42. 1.97km N of Petrolia, CA · 1749 days ago · 26 km deep · 8 km away
  43. 1.814km N of Petrolia, CA · 1749 days ago · 23 km deep · 15 km away
  44. 1.79km SSW of Ferndale, CA · 1749 days ago · 18 km deep · 19 km away
  45. 3.08km SSW of Ferndale, CA · 1749 days ago · 18 km deep · 19 km away · felt by 1
  46. 2.311km SSW of Ferndale, CA · 1749 days ago · 19 km deep · 17 km away
  47. 2.88km NNE of Petrolia, CA · 1749 days ago · 23 km deep · 6 km away
  48. 2.627km W of Petrolia, CA · 1749 days ago · 19 km deep · 35 km away
  49. 2.66km SE of Ferndale, CA · 1749 days ago · 26 km deep · 21 km away
  50. 2.557km WNW of Petrolia, CA · 1749 days ago · 8 km deep · 64 km away
  51. 2.28km NNE of Petrolia, CA · 1749 days ago · 25 km deep · 8 km away
  52. 1.98km N of Petrolia, CA · 1749 days ago · 24 km deep · 9 km away
  53. 2.38km NNE of Petrolia, CA · 1749 days ago · 24 km deep · 7 km away
  54. 1.820km SSE of Rio Dell, CA · 1749 days ago · 29 km deep · 12 km away
  55. 2.46km N of Petrolia, CA · 1749 days ago · 25 km deep · 9 km away
  56. 2.815km WSW of Petrolia, CA · 1749 days ago · 20 km deep · 24 km away
  57. 1.69km NNE of Petrolia, CA · 1749 days ago · 23 km deep · 7 km away
  58. 2.89km NNE of Petrolia, CA · 1749 days ago · 23 km deep · 7 km away
  59. 2.57km N of Petrolia, CA · 1749 days ago · 25 km deep · 9 km away
  60. 2.69km N of Petrolia, CA · 1749 days ago · 27 km deep · 8 km away

The first 60 of at least 199.

Before

  1. 2.59km N of Petrolia, CA · 1749 days ago · 29 km deep · 9 km away
  2. 3.07km NW of Petrolia, CA · 1749 days ago · 28 km deep · 13 km away
  3. 3.111km N of Petrolia, CA · 1749 days ago · 25 km deep · 12 km away · felt by 2
  4. 2.94km NE of Petrolia, CA · 1749 days ago · 22 km deep · 5 km away
  5. 3.327km W of Petrolia, CA · 1749 days ago · 18 km deep · 35 km away · felt by 13
  6. 2.67km N of Petrolia, CA · 1749 days ago · 26 km deep · 8 km away
  7. 2.16km ENE of Petrolia, CA · 1749 days ago · 28 km deep · 3 km away
  8. 2.19km NNE of Petrolia, CA · 1749 days ago · 25 km deep · 7 km away
  9. 2.39km NNE of Petrolia, CA · 1749 days ago · 24 km deep · 7 km away
  10. 1.86km NE of Petrolia, CA · 1749 days ago · 23 km deep · 3 km away
  11. 2.518km W of Petrolia, CA · 1749 days ago · 20 km deep · 26 km away
  12. 2.611km WSW of Rio Dell, CA · 1749 days ago · 25 km deep · 13 km away
  13. 2.65km NNW of Petrolia, CA · 1749 days ago · 28 km deep · 10 km away
  14. 2.810km SSE of Ferndale, CA · 1749 days ago · 25 km deep · 15 km away
  15. 1.915km NNW of Petrolia, CA · 1749 days ago · 26 km deep · 17 km away
  16. 2.812km NNW of Petrolia, CA · 1749 days ago · 26 km deep · 13 km away · felt by 1
  17. 2.99km N of Petrolia, CA · 1749 days ago · 25 km deep · 10 km away · felt by 5
  18. 1.86km NNW of Petrolia, CA · 1749 days ago · 26 km deep · 9 km away
  19. 2.312km SW of Rio Dell, CA · 1749 days ago · 27 km deep · 8 km away
  20. 2.711km N of Petrolia, CA · 1749 days ago · 25 km deep · 12 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73666391. Read Sun, Oct 4, 2026, 3:08 PM UTC.