QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1mb_lg

3 km WNW of Alex, Oklahoma

· 5.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 12 kmMcClain County 35 kmStephens County 50 kmGarvin County 52 kmCleveland County 54 kmCaddo County 58 kmComanche County 68 kmCanadian County 69 kmOklahoma County 78 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 2.1 (mb_lg)
Depth
5.0 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Grady County, 12 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2712 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 lb of TNT

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 34.9334, -97.8148. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 12 km (7 mi) SE of here earthquakes near Grady County
McClain County, OK 35 km (21 mi) WSW of here earthquakes near McClain County
Stephens County, OK 50 km (31 mi) N of here earthquakes near Stephens County
Garvin County, OK 52 km (32 mi) WNW of here earthquakes near Garvin County
Cleveland County, OK 54 km (34 mi) SW of here earthquakes near Cleveland County
Caddo County, OK 58 km (36 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. 1.6 3 km SE of Minco, Oklahoma
  2. 2.2 Oklahoma
  3. 2.2 6 km W of Wayne, Oklahoma
  4. 2.3 6 km W of Wayne, Oklahoma
  5. 1.6 2 km S of Blanchard, Oklahoma
  6. 1.7 10 km W of Dibble, Oklahoma
  7. 2.5 2 km WNW of Bridge Creek, Oklahoma
  8. 2.2 6 km W of Bridge Creek, Oklahoma
  9. 2.1 1 km NW of Bridge Creek, Oklahoma
  10. 2.6 2 km WSW of Bridge Creek, Oklahoma
  11. 2.5 2 km NW of Bridge Creek, Oklahoma
  12. 2.0 1 km WNW of Bridge Creek, Oklahoma
  13. 1.6 1 km NW of Bridge Creek, Oklahoma
  14. 2.1 2 km WNW of Bridge Creek, Oklahoma
  15. 1.8 1 km WNW of Bridge Creek, 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.