QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

5 km NW of Fort Supply, Oklahoma

· 20 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 21 kmWoodward County 37 kmEllis County 45 kmWoods County 68 kmLipscomb County 70 kmComanche County 71 kmClark County 71 kmBeaver County 79 kmDewey County 89 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 1.6 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Harper County, 21 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1021 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 7.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 36.6152, -99.6107. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, OK 21 km (13 mi) SSE of here earthquakes near Harper County
Woodward County, OK 37 km (23 mi) NW of here earthquakes near Woodward County
Ellis County, OK 45 km (28 mi) NNE of here earthquakes near Ellis County
Woods County, OK 68 km (42 mi) W of here earthquakes near Woods County
Lipscomb County, TX 70 km (43 mi) ENE of here earthquakes near Lipscomb County
Comanche County, KS 71 km (44 mi) SSW of here earthquakes near Comanche County

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

Aftershocks so far

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

  1. 1.7 14 km SSE of Freedom, Oklahoma
  2. 1.8 15 km S of Freedom, Oklahoma
  3. 2.0 11 km NE of May, Oklahoma
  4. 1.6 10 km NE of May, Oklahoma
  5. 2.0 18 km SW of May, Oklahoma
  6. 1.6 20 km NNW of Mooreland, Oklahoma
  7. 1.5 23 km NE of Fort Supply, Oklahoma
  8. 1.9 23 km NE of Fort Supply, Oklahoma
  9. 1.8 22 km WSW of Freedom, Oklahoma
  10. 1.8 23 km NE of Fort Supply, Oklahoma
  11. 1.5 18 km ENE of Fort Supply, Oklahoma
  12. 2.9 6 km NE of Follett, Texas

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 4.0 on 2021-05-25 — it released about 5,100 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.