QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

21 km NE of Fort Supply, Oklahoma

· 4.6 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 26 kmWoodward County 33 kmWoods County 47 kmComanche County 54 kmEllis County 62 kmClark County 70 kmBarber County 85 kmMajor County 88 kmDewey County 88 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 2.6 (ml)
Depth
4.6 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Harper County, 26 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3119 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 36.7065, -99.3925. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, OK 26 km (16 mi) ESE of here earthquakes near Harper County
Woodward County, OK 33 km (20 mi) NNW of here earthquakes near Woodward County
Woods County, OK 47 km (29 mi) W of here earthquakes near Woods County
Comanche County, KS 54 km (34 mi) SSW of here earthquakes near Comanche County
Ellis County, OK 62 km (39 mi) NNE of here earthquakes near Ellis County
Clark County, KS 70 km (43 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

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

  1. 2.9 10 km WSW of Waynoka, Oklahoma
  2. 2.5 9 km SW of Waynoka, Oklahoma
  3. 2.4 7 km NNE of Quinlan, Oklahoma
  4. 3.0 7 km NNE of Quinlan, Oklahoma
  5. 2.4 8 km NNE of Quinlan, Oklahoma
  6. 2.3 8 km NNE of Quinlan, Oklahoma
  7. 2.4 8 km NNE of Quinlan, Oklahoma
  8. 2.5 8 km NNE of Quinlan, Oklahoma
  9. 2.8 8 km NNE of Quinlan, Oklahoma
  10. 2.5 8 km NNE of Quinlan, Oklahoma
  11. 2.9 9 km WSW of Waynoka, Oklahoma
  12. 2.7 9 km SW of Waynoka, Oklahoma
  13. 2.7 8 km WSW of Waynoka, Oklahoma
  14. 2.9 7 km WSW of Waynoka, Oklahoma
  15. 2.6 8 km WSW of Waynoka, 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.