QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km NW of Greenfield, Oklahoma

· 7.1 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Blaine County 11 kmKingfisher County 48 kmCanadian County 48 kmCuster County 54 kmDewey County 58 kmMajor County 60 kmCaddo County 68 kmWashita County 75 kmGarfield County 87 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
7.1 km below the surface
Felt
no reports yet
Nearest
Blaine County, 11 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 622 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 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 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× 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 35.7805, -98.4218. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Blaine County, OK 11 km (7 mi) S of here earthquakes near Blaine County
Kingfisher County, OK 48 km (30 mi) WSW of here earthquakes near Kingfisher County
Canadian County, OK 48 km (30 mi) WNW of here earthquakes near Canadian County
Custer County, OK 54 km (34 mi) ENE of here earthquakes near Custer County
Dewey County, OK 58 km (36 mi) ESE of here earthquakes near Dewey County
Major County, OK 60 km (37 mi) S of here earthquakes near Major County

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

Aftershocks so far

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

  1. 1.6 8 km ENE of Calumet, Oklahoma
  2. 2.0 8 km ENE of Calumet, Oklahoma
  3. 2.0 9 km ENE of Calumet, Oklahoma
  4. 1.6 5 km E of Calumet, Oklahoma
  5. 1.7 7 km ENE of Calumet, Oklahoma
  6. 1.9 7 km ENE of Calumet, Oklahoma
  7. 2.0 6 km E of Calumet, Oklahoma
  8. 1.5 6 km ENE of Calumet, Oklahoma
  9. 1.9 4 km WSW of Dover, Oklahoma
  10. 1.8 8 km ENE of Calumet, Oklahoma
  11. 1.5 7 km ENE of Calumet, Oklahoma
  12. 1.6 8 km ENE of Calumet, Oklahoma
  13. 1.9 6 km WSW of Calumet, Oklahoma
  14. 1.5 6 km ENE of Calumet, Oklahoma
  15. 1.6 9 km NE of Calumet, 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

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