QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km NNW of Velma, Oklahoma

· 14 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stephens County 14 kmGarvin County 42 kmJefferson County 48 kmCarter County 50 kmGrady County 57 kmMurray County 59 kmMcClain County 60 kmCotton County 66 kmComanche County 71 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
14 km below the surface
Felt
no reports yet
Nearest
Stephens County, 14 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1238 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 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 34.5235, -97.7160. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stephens County, OK 14 km (8 mi) ENE of here earthquakes near Stephens County
Garvin County, OK 42 km (26 mi) WSW of here earthquakes near Garvin County
Jefferson County, OK 48 km (30 mi) NNE of here earthquakes near Jefferson County
Carter County, OK 50 km (31 mi) NW of here earthquakes near Carter County
Grady County, OK 57 km (36 mi) SSE of here earthquakes near Grady County
Murray County, OK 59 km (37 mi) W of here earthquakes near Murray County

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

Aftershocks so far

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

  1. 2.8 8 km W of Velma, Oklahoma
  2. 2.0 Oklahoma
  3. 1.6 9 km NW of Velma, Oklahoma
  4. 2.1 10 km NW of Velma, Oklahoma
  5. 1.8 12 km SE of Katie, Oklahoma
  6. 2.9 Oklahoma
  7. 1.7 10 km WNW of Velma, Oklahoma
  8. 2.0 8 km WNW of Velma, Oklahoma
  9. 2.7 9 km W of Velma, Oklahoma
  10. 1.7 10 km WNW of Velma, Oklahoma
  11. 1.7 10 km NW of Velma, Oklahoma
  12. 2.0 10 km W of Velma, Oklahoma
  13. 2.2 10 km WNW of Velma, Oklahoma
  14. 2.3 9 km W of Velma, Oklahoma
  15. 1.5 11 km WNW of Velma, 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.