QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km ENE of Hennessey, Oklahoma

· 6.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kingfisher County 22 kmGarfield County 28 kmLogan County 41 kmNoble County 60 kmBlaine County 61 kmCanadian County 66 kmMajor County 67 kmGrant County 74 kmOklahoma 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
6.3 km below the surface
Felt
no reports yet
Nearest
Kingfisher County, 22 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2536 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 5.7 760,000× 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 36.1265, -97.8300. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kingfisher County, OK 22 km (14 mi) NNE of here earthquakes near Kingfisher County
Garfield County, OK 28 km (18 mi) S of here earthquakes near Garfield County
Logan County, OK 41 km (26 mi) NW of here earthquakes near Logan County
Noble County, OK 60 km (38 mi) WSW of here earthquakes near Noble County
Blaine County, OK 61 km (38 mi) ENE of here earthquakes near Blaine County
Canadian County, OK 66 km (41 mi) NNE of here earthquakes near Canadian County

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

Aftershocks so far

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

  1. 3.6 5 km N of Ames, Oklahoma
  2. 2.5 Oklahoma
  3. 3.6 1 km N of Fairmont, Oklahoma
  4. 2.3 1 km N of Fairmont, Oklahoma
  5. 2.0 1 km N of Fairmont, Oklahoma
  6. 2.2 3 km NE of Fairmont, Oklahoma
  7. 1.6 6 km ENE of Hennessey, Oklahoma
  8. 2.5 8 km S of Goltry, Oklahoma
  9. 2.5 3 km ENE of Douglas, Oklahoma
  10. 1.6 2 km ENE of Douglas, Oklahoma
  11. 1.6 5 km NW of Mulhall, Oklahoma
  12. 1.6 6 km NW of North Enid, Oklahoma
  13. 2.5 3 km ENE of Douglas, Oklahoma
  14. 1.9 6 km NNE of Ames, Oklahoma
  15. 1.6 6 km NNE of Ames, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2018-04-09 — it released about 17,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.