QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1mb_lg

28 km SSE of Protection, Kansas

· 5.0 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Comanche County 25 kmHarper County 34 kmWoods County 51 kmClark County 51 kmWoodward County 61 kmBarber County 65 kmKiowa County 66 kmEllis County 90 kmPratt County 93 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 3.1 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Comanche County, 25 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3239 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 36.9692, -99.3456. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Comanche County, KS 25 km (16 mi) SSW of here earthquakes near Comanche County
Harper County, OK 34 km (21 mi) ENE of here earthquakes near Harper County
Woods County, OK 51 km (31 mi) WNW of here earthquakes near Woods County
Clark County, KS 51 km (32 mi) SE of here earthquakes near Clark County
Woodward County, OK 61 km (38 mi) N of here earthquakes near Woodward County
Barber County, KS 65 km (40 mi) WSW of here earthquakes near Barber County

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

Aftershocks so far

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

  1. 2.7 16 km SSW of Freedom, Oklahoma
  2. 2.4 14 km SSE of Freedom, Oklahoma
  3. 2.8 14 km SSE of Freedom, Oklahoma
  4. 2.9 14 km SSE of Freedom, Oklahoma
  5. 2.8 23 km NE of Fort Supply, Oklahoma
  6. 2.6 15 km SSW of Freedom, Oklahoma
  7. 2.5 14 km WNW of Waynoka, Oklahoma
  8. 2.6 14 km WNW of Waynoka, Oklahoma
  9. 2.9 14 km SSE of Freedom, Oklahoma
  10. 2.1 6 km WNW of Buffalo, Oklahoma
  11. 2.3 8 km W of Buffalo, Oklahoma
  12. 2.8 22 km NE of Fort Supply, Oklahoma
  13. 2.7 27 km SSE of Protection, Kansas
  14. 3.0 22 km NE of Fort Supply, Oklahoma
  15. 2.4 12 km NNE of Woodward, 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.