QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

8 km NE of Alex, Oklahoma

· 10 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 17 kmMcClain County 24 kmCleveland County 44 kmGarvin County 46 kmStephens County 56 kmCaddo County 65 kmCanadian County 69 kmOklahoma County 71 kmPottawatomie County 74 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 3.4 (ml)
Depth
10 km below the surface
Felt
54 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
Nearest
Grady County, 17 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2318 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 54 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 34.9668, -97.7080. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 17 km (11 mi) ESE of here earthquakes near Grady County
McClain County, OK 24 km (15 mi) WSW of here earthquakes near McClain County
Cleveland County, OK 44 km (27 mi) SW of here earthquakes near Cleveland County
Garvin County, OK 46 km (29 mi) NW of here earthquakes near Garvin County
Stephens County, OK 56 km (35 mi) NNE of here earthquakes near Stephens County
Caddo County, OK 65 km (41 mi) ESE of here earthquakes near Caddo County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 1.5 7 km WSW of Blanchard, Oklahoma
  2. 1.8 3 km WNW of Minco, Oklahoma
  3. 1.6 3 km W of Minco, Oklahoma
  4. 1.6 7 km SW of Blanchard, Oklahoma
  5. 1.6 7 km WSW of Blanchard, Oklahoma
  6. 1.7 6 km WNW of Minco, Oklahoma
  7. 1.6 7 km SW of Blanchard, Oklahoma
  8. 1.6 6 km SW of Blanchard, Oklahoma
  9. 2.3 4 km WNW of Minco, Oklahoma
  10. 1.6 3 km WNW of Minco, Oklahoma
  11. 1.6 4 km WNW of Minco, Oklahoma
  12. 1.6 4 km WNW of Minco, Oklahoma
  13. 1.8 4 km WNW of Minco, Oklahoma
  14. 1.9 2 km WSW of Minco, Oklahoma
  15. 1.7 4 km WNW of Minco, Oklahoma

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.