QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

18 km ENE of Fort Supply, Oklahoma

· 4.7 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 28 kmWoodward County 29 kmWoods County 48 kmEllis County 58 kmComanche County 59 kmClark County 73 kmDewey County 84 kmMajor County 86 kmBarber 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 1.5 (ml)
Depth
4.7 km below the surface
Felt
no reports yet
Nearest
Harper County, 28 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 998 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 5.7 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 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 36.6665, -99.3978. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, OK 28 km (17 mi) ESE of here earthquakes near Harper County
Woodward County, OK 29 km (18 mi) NNW of here earthquakes near Woodward County
Woods County, OK 48 km (30 mi) W of here earthquakes near Woods County
Ellis County, OK 58 km (36 mi) NNE of here earthquakes near Ellis County
Comanche County, KS 59 km (36 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

13 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 10 km NNE of Freedom, Oklahoma
  7. 1.6 20 km NNW of Mooreland, Oklahoma
  8. 1.8 7 km NNW of Waynoka, Oklahoma
  9. 1.5 23 km NE of Fort Supply, Oklahoma
  10. 1.9 23 km NE of Fort Supply, Oklahoma
  11. 1.8 22 km WSW of Freedom, Oklahoma
  12. 1.8 23 km NE of Fort Supply, Oklahoma
  13. 1.7 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.