QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km NNE of Custer City, Oklahoma

· 7.7 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 17 kmDewey County 33 kmBlaine County 40 kmWashita County 50 kmMajor County 71 kmCaddo County 74 kmCanadian County 80 kmRoger Mills County 82 kmKingfisher County 85 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
7.7 km below the surface
Felt
no reports yet
Nearest
Custer County, 17 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2526 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 35.7242, -98.8355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, OK 17 km (11 mi) ENE of here earthquakes near Custer County
Dewey County, OK 33 km (20 mi) SSE of here earthquakes near Dewey County
Blaine County, OK 40 km (25 mi) WSW of here earthquakes near Blaine County
Washita County, OK 50 km (31 mi) NNE of here earthquakes near Washita County
Major County, OK 71 km (44 mi) SSW of here earthquakes near Major County
Caddo County, OK 74 km (46 mi) NNW of here earthquakes near Caddo County

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

Aftershocks so far

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

  1. 2.3 9 km ESE of Thomas, Oklahoma
  2. 1.6 8 km ESE of Thomas, Oklahoma
  3. 1.6 8 km ESE of Thomas, Oklahoma
  4. 1.7 8 km ESE of Thomas, Oklahoma
  5. 1.5 6 km W of Longdale, Oklahoma
  6. 1.7 12 km NW of Watonga, Oklahoma
  7. 1.5 15 km W of Canton, Oklahoma
  8. 1.7 7 km WSW of Custer City, Oklahoma
  9. 1.8 7 km S of Putnam, Oklahoma
  10. 1.7 6 km N of Arapaho, Oklahoma
  11. 1.6 6 km WSW of Custer City, Oklahoma
  12. 1.8 7 km N of Arapaho, Oklahoma
  13. 1.6 6 km WSW of Custer City, Oklahoma
  14. 2.4 4 km W of Seiling, Oklahoma
  15. 1.8 6 km W of Custer City, 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.