QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km W of Custer City, Oklahoma

· 5.6 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 4 kmDewey County 36 kmWashita County 41 kmBlaine County 53 kmRoger Mills County 71 kmCaddo County 75 kmBeckham County 79 kmKiowa County 82 kmMajor 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
5.6 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Custer County, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2112 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 35.6552, -98.9545. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, OK 4 km (2 mi) ENE of here earthquakes near Custer County
Dewey County, OK 36 km (23 mi) S of here earthquakes near Dewey County
Washita County, OK 41 km (25 mi) N of here earthquakes near Washita County
Blaine County, OK 53 km (33 mi) WSW of here earthquakes near Blaine County
Roger Mills County, OK 71 km (44 mi) E of here earthquakes near Roger Mills County
Caddo County, OK 75 km (47 mi) NW of here earthquakes near Caddo 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. 1.5 10 km WNW of Greenfield, Oklahoma
  2. 1.5 10 km NE of Thomas, Oklahoma
  3. 1.6 6 km NW of Greenfield, Oklahoma
  4. 1.7 14 km W of Greenfield, Oklahoma
  5. 1.8 7 km W of Thomas, Oklahoma
  6. 1.8 6 km WNW of Thomas, Oklahoma
  7. 1.6 6 km WNW of Thomas, Oklahoma
  8. 1.7 15 km ENE of Thomas, Oklahoma
  9. 1.8 16 km ENE of Thomas, Oklahoma
  10. 1.7 16 km ENE of Thomas, Oklahoma
  11. 1.5 15 km ENE of Thomas, Oklahoma
  12. 1.9 13 km ENE of Thomas, Oklahoma
  13. 2.0 15 km WSW of Watonga, Oklahoma
  14. 1.7 15 km ENE of Thomas, Oklahoma
  15. 1.7 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.