QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

17 km NW of Alva, Oklahoma

· 5.2 km deep · released about 82 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woods County 21 kmBarber County 37 kmAlfalfa County 48 kmComanche County 50 kmWoodward County 68 kmMajor County 70 kmHarper County 73 kmHarper County 77 kmPratt County 82 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 2.3 (ml)
Depth
5.2 km below the surface
Felt
no reports yet
Nearest
Woods County, 21 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2328 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 82 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 82 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 36.9087, -98.8092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woods County, OK 21 km (13 mi) NNE of here earthquakes near Woods County
Barber County, KS 37 km (23 mi) SSW of here earthquakes near Barber County
Alfalfa County, OK 48 km (30 mi) WNW of here earthquakes near Alfalfa County
Comanche County, KS 50 km (31 mi) SE of here earthquakes near Comanche County
Woodward County, OK 68 km (42 mi) NE of here earthquakes near Woodward County
Major County, OK 70 km (44 mi) NNW of here earthquakes near Major County

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

Aftershocks so far

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

  1. 1.5 9 km NNE of Quinlan, Oklahoma
  2. 1.8 9 km NNE of Quinlan, Oklahoma
  3. 1.6 10 km NNE of Quinlan, Oklahoma
  4. 1.6 10 km NE of Quinlan, Oklahoma
  5. 2.0 10 km NNE of Quinlan, Oklahoma
  6. 1.8 10 km NNE of Quinlan, Oklahoma
  7. 1.8 9 km NE of Quinlan, Oklahoma
  8. 1.6 9 km NE of Quinlan, Oklahoma
  9. 1.6 1 km N of Lambert, Oklahoma
  10. 1.9 8 km S of Avard, Oklahoma
  11. 2.2 10 km NNE of Quinlan, Oklahoma
  12. 1.6 10 km NE of Quinlan, Oklahoma
  13. 1.9 10 km WSW of Waynoka, Oklahoma
  14. 1.6 10 km NNE of Quinlan, Oklahoma
  15. 1.6 10 km NNE of Quinlan, 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 16,000 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.