Oklahoma earthquakes

M1.7 earthquake 7 km NE of Alex, Oklahoma

A magnitude 1.7 earthquake struck 7 km NE of Alex, Oklahoma on Tue, Sep 7, 2021, 2:47 AM CDT (07:47 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.6 2 km ESE of Luther, Oklahoma. This one was a foreshock.

Alex 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
1.7 (ml), micro
Local time
UTC
2021-09-07 07:47:20 UTC
Depth
9.0 km (5.6 mi), shallow
Epicenter
34.959° N, 97.713° W
Region
Oklahoma
Felt reports
1
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

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.

Magnitude uncertainty
±0.26
Station coverage gap
40°
Stations used
74

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.64 km ESE of El Reno, Oklahoma · 1847 days ago · 23 km deep · 64 km away
  2. 2.27 km SSE of Erin Springs, Oklahoma · 1836 days ago · 7 km deep · 27 km away · felt by 1
  3. 1.87 km SSE of Erin Springs, Oklahoma · 1836 days ago · 7 km deep · 27 km away
  4. 1.93 km S of Blanchard, Oklahoma · 1835 days ago · 4 km deep · 17 km away · felt by 11
  5. 1.87 km SSE of Erin Springs, Oklahoma · 1833 days ago · 7 km deep · 27 km away
  6. 1.77 km SSE of Erin Springs, Oklahoma · 1833 days ago · 7 km deep · 26 km away
  7. 2.211 km E of Comanche, Oklahoma · 1824 days ago · 9 km deep · 66 km away
  8. 1.73 km E of Bradley, Oklahoma · 1822 days ago · 13 km deep · 10 km away
  9. 1.63 km E of Bradley, Oklahoma · 1821 days ago · 13 km deep · 9 km away
  10. 2.13 km E of Bradley, Oklahoma · 1817 days ago · 5 km deep · 9 km away · felt by 4
  11. 1.83 km E of Bradley, Oklahoma · 1816 days ago · 5 km deep · 10 km away
  12. 2.62 km ESE of Luther, Oklahoma · 1816 days ago · 7 km deep · 92 km away · felt by 3
  13. 1.65 km W of Yukon, Oklahoma · 1814 days ago · 4 km deep · 61 km away
  14. 1.62 km ESE of Luther, Oklahoma · 1809 days ago · 7 km deep · 92 km away
  15. 1.813 km WSW of El Reno, Oklahoma · 1795 days ago · 5 km deep · 66 km away · felt by 1
  16. 1.611 km WSW of El Reno, Oklahoma · 1793 days ago · 6 km deep · 67 km away
  17. 1.811 km WSW of El Reno, Oklahoma · 1793 days ago · 6 km deep · 66 km away
  18. 1.57 km NE of Harrah, Oklahoma · 1793 days ago · 7 km deep · 85 km away

Before

  1. 2.76 km NNE of Alex, Oklahoma · 1850 days ago · 8 km deep · 4 km away · felt by 4
  2. 1.66 km S of Ratliff City, Oklahoma · 1850 days ago · 10 km deep · 66 km away
  3. 1.55 km ESE of Union City, Oklahoma · 1855 days ago · 4 km deep · 49 km away
  4. 1.68 km SW of Dibble, Oklahoma · 1857 days ago · 8 km deep · 3 km away
  5. 2.05 km ENE of Edmond, Oklahoma · 1862 days ago · 7 km deep · 84 km away · felt by 10
  6. 2.11 km SSW of Verden, Oklahoma · 1871 days ago · 9 km deep · 37 km away · felt by 1
  7. 2.15 km ENE of Edmond, Oklahoma · 1873 days ago · 7 km deep · 84 km away · felt by 48

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ok2021rnnr (also filed as us7000f8sn). Read Mon, Sep 28, 2026, 5:43 PM UTC.