QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14 km SE of Buffalo, Oklahoma

· 7.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 15 kmWoodward County 41 kmComanche County 55 kmWoods County 58 kmEllis County 61 kmClark County 61 kmLipscomb County 85 kmBeaver County 86 kmBarber County 91 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
7.0 km below the surface
Felt
no reports yet
Nearest
Harper County, 15 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1329 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 36.7385, -99.5143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, OK 15 km (9 mi) ESE of here earthquakes near Harper County
Woodward County, OK 41 km (25 mi) NNW of here earthquakes near Woodward County
Comanche County, KS 55 km (34 mi) SSW of here earthquakes near Comanche County
Woods County, OK 58 km (36 mi) W of here earthquakes near Woods County
Ellis County, OK 61 km (38 mi) NNE of here earthquakes near Ellis County
Clark County, KS 61 km (38 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

14 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. 1.5 23 km NE of Fort Supply, Oklahoma
  9. 1.9 23 km NE of Fort Supply, Oklahoma
  10. 1.8 22 km WSW of Freedom, Oklahoma
  11. 1.8 23 km NE of Fort Supply, Oklahoma
  12. 1.5 18 km ENE of Fort Supply, Oklahoma
  13. 1.6 5 km NW of Fort Supply, Oklahoma
  14. 1.6 14 km NE of Fort Supply, 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.