QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

8 km W of Velma, Oklahoma

· 18 km deep · released about 550 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stephens County 9 kmJefferson County 42 kmGarvin County 49 kmCarter County 50 kmCotton County 60 kmGrady County 62 kmMurray County 63 kmMcClain County 67 kmComanche County 69 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 2.8 (ml)
Depth
18 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Stephens County, 9 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1030 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 34.4735, -97.7612. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stephens County, OK 9 km (5 mi) E of here earthquakes near Stephens County
Jefferson County, OK 42 km (26 mi) N of here earthquakes near Jefferson County
Garvin County, OK 49 km (30 mi) WSW of here earthquakes near Garvin County
Carter County, OK 50 km (31 mi) WNW of here earthquakes near Carter County
Cotton County, OK 60 km (37 mi) ENE of here earthquakes near Cotton County
Grady County, OK 62 km (39 mi) S of here earthquakes near Grady County

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

Aftershocks so far

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

  1. 2.0 9 km WNW of Velma, Oklahoma
  2. 1.8 9 km WNW of Velma, Oklahoma
  3. 1.7 10 km WNW of Velma, Oklahoma
  4. 1.8 8 km WNW of Velma, Oklahoma
  5. 1.8 9 km WNW of Velma, Oklahoma
  6. 1.6 9 km WNW of Velma, Oklahoma
  7. 1.6 7 km WNW of Velma, Oklahoma
  8. 1.6 10 km WNW of Velma, Oklahoma
  9. 2.0 8 km N of Foster, Oklahoma
  10. 2.2 6 km NNE of Lindsay, Oklahoma
  11. 1.8 10 km NNW of Healdton, Oklahoma
  12. 1.5 7 km N of Velma, Oklahoma
  13. 1.6 5 km NNW of Tatums, Oklahoma
  14. 1.5 6 km NNW of Tatums, Oklahoma
  15. 1.6 5 km NNW of Tatums, 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.