QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

5 km NNE of Fort Supply, Oklahoma

· 17 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 23 kmWoodward County 32 kmEllis County 47 kmWoods County 62 kmComanche County 68 kmClark County 73 kmLipscomb County 75 kmBeaver County 85 kmDewey County 86 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
17 km below the surface
Felt
no reports yet
Nearest
Harper County, 23 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1466 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 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 36.6170, -99.5452. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, OK 23 km (14 mi) SSE of here earthquakes near Harper County
Woodward County, OK 32 km (20 mi) NW of here earthquakes near Woodward County
Ellis County, OK 47 km (29 mi) NNE of here earthquakes near Ellis County
Woods County, OK 62 km (39 mi) W of here earthquakes near Woods County
Comanche County, KS 68 km (42 mi) SSW of here earthquakes near Comanche County
Clark County, KS 73 km (45 mi) SSE of here earthquakes near Clark County

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

Aftershocks so far

17 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. 1.7 4 km NNE of Quinlan, Oklahoma
  13. 1.6 5 km NW of Fort Supply, Oklahoma
  14. 1.6 14 km NE of Fort Supply, Oklahoma
  15. 2.2 4 km NNE of Quinlan, 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 4.0 on 2021-05-25 — it released about 5,600 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.