QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

4 km S of Alva, Oklahoma

· 7.2 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woods County 18 kmAlfalfa County 31 kmBarber County 51 kmMajor County 52 kmWoodward County 66 kmComanche County 69 kmHarper County 71 kmGrant County 78 kmHarper County 89 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 1.5 (ml)
Depth
7.2 km below the surface
Felt
no reports yet
Nearest
Woods County, 18 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2470 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 36.7668, -98.6680. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woods County, OK 18 km (11 mi) ENE of here earthquakes near Woods County
Alfalfa County, OK 31 km (19 mi) W of here earthquakes near Alfalfa County
Barber County, KS 51 km (32 mi) S of here earthquakes near Barber County
Major County, OK 52 km (32 mi) NNW of here earthquakes near Major County
Woodward County, OK 66 km (41 mi) NE of here earthquakes near Woodward County
Comanche County, KS 69 km (43 mi) SE of here earthquakes near Comanche County

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

Aftershocks so far

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

  1. 1.7 9 km NNE of Quinlan, Oklahoma
  2. 1.6 13 km SSE of Waynoka, Oklahoma
  3. 2.1 14 km WNW of Alva, Oklahoma
  4. 1.6 14 km WNW of Alva, Oklahoma
  5. 1.6 16 km SSE of Waynoka, Oklahoma
  6. 1.7 16 km SE of Waynoka, Oklahoma
  7. 1.6 7 km WSW of Carmen, Oklahoma
  8. 1.9 Oklahoma
  9. 1.9 14 km SSW of Dacoma, Oklahoma
  10. 1.7 9 km SW of Aline, Oklahoma
  11. 1.6 10 km NE of Quinlan, Oklahoma
  12. 2.1 16 km SE of Waynoka, Oklahoma
  13. 2.0 10 km WSW of Waynoka, Oklahoma
  14. 2.2 10 km NNE of Quinlan, Oklahoma
  15. 1.7 10 km NE 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 220,000 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.