QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km NE of Velma, Oklahoma

· 6.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stephens County 23 kmGarvin County 34 kmCarter County 43 kmMurray County 50 kmJefferson County 51 kmMcClain County 57 kmGrady County 60 kmLove County 72 kmCotton 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 1.8 (ml)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Stephens County, 23 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2677 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× 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 34.5250, -97.6150. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stephens County, OK 23 km (14 mi) ENE of here earthquakes near Stephens County
Garvin County, OK 34 km (21 mi) SW of here earthquakes near Garvin County
Carter County, OK 43 km (27 mi) NW of here earthquakes near Carter County
Murray County, OK 50 km (31 mi) W of here earthquakes near Murray County
Jefferson County, OK 51 km (32 mi) NNE of here earthquakes near Jefferson County
McClain County, OK 57 km (35 mi) SSW of here earthquakes near McClain County

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

Aftershocks so far

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

  1. 2.0 5 km NNE of Velma, Oklahoma
  2. 2.5 3 km NNE of Velma, Oklahoma
  3. 2.3 2 km NNE of Velma, Oklahoma
  4. 1.8 8 km NE of Alex, Oklahoma
  5. 2.2 8 km NE of Alex, Oklahoma
  6. 3.0 8 km NE of Alex, Oklahoma
  7. 2.1 9 km NE of Alex, Oklahoma
  8. 1.8 Oklahoma
  9. 2.0 8 km NE of Alex, Oklahoma
  10. 2.1 8 km NE of Alex, Oklahoma
  11. 2.3 8 km NE of Alex, Oklahoma
  12. 2.4 1 km E of Katie, Oklahoma
  13. 2.0 9 km NE of Alex, Oklahoma
  14. 1.8 7 km NE of Alex, Oklahoma
  15. 1.6 9 km NE of Alex, 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.