QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4 km WSW of Aline, Oklahoma

· 9.1 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Major County 20 kmAlfalfa County 31 kmWoods County 42 kmGarfield County 64 kmBlaine County 68 kmWoodward County 70 kmGrant County 71 kmDewey County 74 kmKingfisher County 78 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 2.1 (ml)
Depth
9.1 km below the surface
Felt
no reports yet
Nearest
Major County, 20 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1846 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 36.4905, -98.4945. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Major County, OK 20 km (13 mi) NNE of here earthquakes near Major County
Alfalfa County, OK 31 km (19 mi) SSW of here earthquakes near Alfalfa County
Woods County, OK 42 km (26 mi) SE of here earthquakes near Woods County
Garfield County, OK 64 km (40 mi) WNW of here earthquakes near Garfield County
Blaine County, OK 68 km (42 mi) N of here earthquakes near Blaine County
Woodward County, OK 70 km (44 mi) E of here earthquakes near Woodward 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. 1.9 21 km NE of Chester, Oklahoma
  2. 1.9 16 km SE of Waynoka, Oklahoma
  3. 1.7 17 km SSE of Waynoka, Oklahoma
  4. 1.6 7 km NNE of Ames, Oklahoma
  5. 1.7 17 km SSE of Waynoka, Oklahoma
  6. 1.5 16 km SE of Waynoka, Oklahoma
  7. 1.7 7 km E of Nescatunga, Oklahoma
  8. 1.8 4 km WSW of Aline, Oklahoma
  9. 1.7 7 km SW of Goltry, Oklahoma
  10. 1.7 6 km W of Ringwood, Oklahoma
  11. 2.3 7 km ENE of Nescatunga, Oklahoma
  12. 1.9 16 km SSE of Waynoka, Oklahoma
  13. 1.8 16 km SSE of Waynoka, Oklahoma
  14. 2.2 15 km SSE of Waynoka, Oklahoma
  15. 2.5 15 km SSE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-02-13 — it released about 34,000 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.