QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km W of Ninnekah, Oklahoma

· 5.0 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 10 kmCaddo County 46 kmMcClain County 47 kmStephens County 52 kmComanche County 57 kmGarvin County 64 kmCleveland County 64 kmCanadian County 67 kmCotton County 82 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 1.8 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Grady County, 10 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2669 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 34.9455, -97.9538. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 10 km (6 mi) SW of here earthquakes near Grady County
Caddo County, OK 46 km (29 mi) ESE of here earthquakes near Caddo County
McClain County, OK 47 km (29 mi) W of here earthquakes near McClain County
Stephens County, OK 52 km (33 mi) N of here earthquakes near Stephens County
Comanche County, OK 57 km (36 mi) ENE of here earthquakes near Comanche County
Garvin County, OK 64 km (40 mi) WNW of here earthquakes near Garvin County

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

Aftershocks so far

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

  1. 1.9 5 km NNW of Bridge Creek, Oklahoma
  2. 1.6 8 km NW of Newcastle, Oklahoma
  3. 1.9 7 km NW of Newcastle, Oklahoma
  4. 2.2 6 km NW of Newcastle, Oklahoma
  5. 2.1 7 km NW of Newcastle, Oklahoma
  6. 1.8 8 km NW of Newcastle, Oklahoma
  7. 1.9 8 km NW of Newcastle, Oklahoma
  8. 2.0 8 km W of Dibble, Oklahoma
  9. 1.9 5 km WNW of Dibble, Oklahoma
  10. 1.9 5 km WNW of Dibble, Oklahoma
  11. 1.9 4 km E of Tuttle, Oklahoma
  12. 2.0 5 km E of Tuttle, Oklahoma
  13. 1.8 0 km WNW of Bridge Creek, Oklahoma
  14. 2.0 3 km ESE of Blanchard, Oklahoma
  15. 1.9 5 km SE of Chickasha, 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.