QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5mb_lg

9 km N of Nash, Oklahoma

· 5.4 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 23 kmAlfalfa County 25 kmGarfield County 48 kmHarper County 48 kmMajor County 66 kmSumner County 73 kmWoods County 73 kmBarber County 77 kmKay County 80 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 2.5 (mb_lg)
Depth
5.4 km below the surface
Felt
no reports yet
Nearest
Grant County, 23 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2915 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 36.7540, -98.0429. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 23 km (14 mi) W of here earthquakes near Grant County
Alfalfa County, OK 25 km (16 mi) E of here earthquakes near Alfalfa County
Garfield County, OK 48 km (30 mi) NNW of here earthquakes near Garfield County
Harper County, KS 48 km (30 mi) S of here earthquakes near Harper County
Major County, OK 66 km (41 mi) NE of here earthquakes near Major County
Sumner County, KS 73 km (45 mi) SW of here earthquakes near Sumner County

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

Aftershocks so far

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

  1. 1.7 5 km E of Bluff City, Kansas
  2. 2.9 5 km E of Bluff City, Kansas
  3. 2.7 6 km NE of Medford, Oklahoma
  4. 1.7 5 km E of Bluff City, Kansas
  5. 2.2 5 km E of Bluff City, Kansas
  6. 1.7 4 km E of Bluff City, Kansas
  7. 1.8 4 km E of Bluff City, Kansas
  8. 1.9 4 km E of Bluff City, Kansas
  9. 2.7 9 km ENE of Nash, Oklahoma
  10. 2.2 Kansas
  11. 2.8 5 km E of Bluff City, Kansas
  12. 2.8 6 km NE of Medford, Oklahoma
  13. 3.5 5 km NE of Medford, Oklahoma
  14. 2.7 10 km ESE of Jefferson, Oklahoma
  15. 2.6 10 km W of Lamont, 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 4.4 on 2018-06-09 — it released about 710 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.