Oklahoma earthquakes

M3.8 earthquake 9 km SSW of Helena, Oklahoma

A magnitude 3.8 earthquake struck 9 km SSW of Helena, Oklahoma on Fri, Oct 21, 2016, 3:25 PM CDT (20:25 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.1 17 km SE of Waynoka, Oklahoma. This one was a foreshock.

Helena forecastMore in Oklahoma

Map

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

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The earthquake

Magnitude
3.8 (mb_lg), minor
Local time
UTC
2016-10-21 20:25:35 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
36.464° N, 98.304° W
Region
Oklahoma
Strongest shaking
IV, light shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
IV, light shaking
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

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 1.0 km horizontally, 1.6 km in depth
Magnitude uncertainty
±0.05
Depth from
Operator assigned
Station coverage gap
88°
Stations used
52

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 3.117 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 42 km away
  2. 3.417 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 43 km away · felt by 1
  3. 2.717 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 43 km away
  4. 3.017 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 43 km away
  5. 3.217 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 43 km away
  6. 2.817 km SSE of Waynoka, Oklahoma · 3623 days ago · 7 km deep · 43 km away
  7. 2.517 km SSE of Waynoka, Oklahoma · 3623 days ago · 8 km deep · 43 km away
  8. 2.8Oklahoma · 3622 days ago · 8 km deep · 42 km away
  9. 2.617 km SSE of Waynoka, Oklahoma · 3622 days ago · 8 km deep · 43 km away
  10. 1.78 km WSW of Hunnewell, Kansas · 3622 days ago · 5 km deep · 92 km away
  11. 2.517 km SSE of Waynoka, Oklahoma · 3622 days ago · 7 km deep · 43 km away
  12. 2.517 km SSE of Waynoka, Oklahoma · 3622 days ago · 7 km deep · 43 km away
  13. 2.73 km ENE of Medford, Oklahoma · 3622 days ago · 8 km deep · 67 km away
  14. 3.113 km SSE of Freedom, Oklahoma · 3622 days ago · 5 km deep · 72 km away
  15. 2.617 km SSE of Waynoka, Oklahoma · 3622 days ago · 8 km deep · 42 km away
  16. 2.20 km N of Manchester, Oklahoma · 3622 days ago · 6 km deep · 64 km away
  17. 2.817 km SSE of Waynoka, Oklahoma · 3621 days ago · 7 km deep · 43 km away · felt by 4
  18. 2.617 km SSE of Waynoka, Oklahoma · 3621 days ago · 6 km deep · 42 km away
  19. 3.32 km WNW of Deer Creek, Oklahoma · 3621 days ago · 8 km deep · 78 km away · felt by 2
  20. 3.55 km SSE of Freeport, Kansas · 3620 days ago · 5 km deep · 88 km away · felt by 6
  21. 2.75 km SSE of Freeport, Kansas · 3620 days ago · 5 km deep · 88 km away
  22. 1.69 km W of Bluff City, Kansas · 3620 days ago · 8 km deep · 73 km away
  23. 2.56 km NE of Avard, Oklahoma · 3620 days ago · 3 km deep · 49 km away
  24. 1.65 km SSE of Freeport, Kansas · 3620 days ago · 5 km deep · 88 km away
  25. 1.59 km ESE of Bluff City, KS · 3619 days ago · 4 km deep · 79 km away
  26. 1.79 km ESE of Bluff City, Kansas · 3619 days ago · 4 km deep · 79 km away
  27. 1.79 km W of Bluff City, Kansas · 3619 days ago · 7 km deep · 74 km away
  28. 2.55 km SSE of Freeport, Kansas · 3619 days ago · 5 km deep · 88 km away · felt by 2
  29. 2.617 km SSE of Waynoka, Oklahoma · 3619 days ago · 8 km deep · 42 km away · felt by 1
  30. 1.95 km SSE of Freeport, Kansas · 3619 days ago · 5 km deep · 88 km away
  31. 2.15 km SSE of Freeport, Kansas · 3619 days ago · 5 km deep · 88 km away
  32. 1.7Kansas · 3619 days ago · 5 km deep · 88 km away
  33. 1.97 km ESE of Bluff City, Kansas · 3619 days ago · 5 km deep · 79 km away
  34. 3.56 km ENE of Covington, Oklahoma · 3618 days ago · 8 km deep · 72 km away · felt by 3
  35. 2.617 km ESE of Waynoka, Oklahoma · 3618 days ago · 5 km deep · 36 km away
  36. 1.56 km ENE of Caldwell, Kansas · 3617 days ago · 6 km deep · 94 km away
  37. 2.75 km NE of Avard, Oklahoma · 3617 days ago · 5 km deep · 49 km away
  38. 2.517 km SSE of Waynoka, Oklahoma · 3617 days ago · 7 km deep · 43 km away
  39. 2.617 km SSE of Waynoka, Oklahoma · 3617 days ago · 6 km deep · 43 km away
  40. 2.04 km SW of Harper, Kansas · 3616 days ago · 3 km deep · 90 km away
  41. 2.9Oklahoma · 3616 days ago · 8 km deep · 40 km away
  42. 1.75 km SE of Freeport, Kansas · 3616 days ago · 4 km deep · 89 km away
  43. 3.08 km E of Nescatunga, Oklahoma · 3616 days ago · 7 km deep · 39 km away
  44. 2.29 km ESE of Bluff City, Kansas · 3616 days ago · 4 km deep · 79 km away
  45. 1.85 km ESE of Caldwell, Kansas · 3616 days ago · 6 km deep · 90 km away
  46. 2.43 km SW of Red Rock, Oklahoma · 3616 days ago · 6 km deep · 98 km away · felt by 1
  47. 3.16 km NE of Billings, Oklahoma · 3615 days ago · 6 km deep · 83 km away · felt by 1
  48. 2.56 km NE of Billings, Oklahoma · 3615 days ago · 7 km deep · 82 km away
  49. 3.27 km NE of Billings, Oklahoma · 3615 days ago · 8 km deep · 83 km away · felt by 3
  50. 2.57 km NE of Billings, Oklahoma · 3615 days ago · 8 km deep · 83 km away
  51. 2.76 km NE of Billings, Oklahoma · 3615 days ago · 8 km deep · 83 km away · felt by 1
  52. 2.34 km ESE of Caldwell, Kansas · 3615 days ago · 6 km deep · 90 km away
  53. 1.64 km SE of Freeport, Kansas · 3615 days ago · 2 km deep · 89 km away
  54. 1.88 km ESE of Bluff City, Kansas · 3614 days ago · 4 km deep · 79 km away
  55. 1.8Kansas · 3614 days ago · 4 km deep · 96 km away
  56. 2.63 km SSE of Meno, Oklahoma · 3614 days ago · 8 km deep · 17 km away · felt by 3
  57. 1.84 km ESE of Caldwell, Kansas · 3614 days ago · 5 km deep · 90 km away
  58. 3.37 km SE of Perry, Oklahoma · 3614 days ago · 8 km deep · 100 km away · felt by 7
  59. 2.24 km ESE of Caldwell, Kansas · 3614 days ago · 5 km deep · 90 km away
  60. 3.44 km WNW of Lucien, Oklahoma · 3614 days ago · 8 km deep · 74 km away · felt by 11

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20007g00. Read Tue, Sep 22, 2026, 3:50 PM UTC.