QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

15 km WNW of Alva, Oklahoma

· 4.1 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woods County 16 kmBarber County 41 kmAlfalfa County 47 kmComanche County 52 kmWoodward County 64 kmMajor County 67 kmHarper County 75 kmHarper County 76 kmPratt County 87 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 2.7 (ml)
Depth
4.1 km below the surface
Felt
no reports yet
Nearest
Woods County, 16 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3383 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 36.8706, -98.8206. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woods County, OK 16 km (10 mi) NNE of here earthquakes near Woods County
Barber County, KS 41 km (25 mi) SSW of here earthquakes near Barber County
Alfalfa County, OK 47 km (29 mi) WNW of here earthquakes near Alfalfa County
Comanche County, KS 52 km (32 mi) SE of here earthquakes near Comanche County
Woodward County, OK 64 km (40 mi) NE of here earthquakes near Woodward County
Major County, OK 67 km (42 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

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

  1. 2.6 Oklahoma
  2. 2.8 Oklahoma
  3. 2.8 9 km SW of Waynoka, Oklahoma
  4. 3.5 9 km SW of Waynoka, Oklahoma
  5. 2.3 10 km NNE of Quinlan, Oklahoma
  6. 2.4 1 km NNW of Lambert, Oklahoma
  7. 2.9 17 km SSE of Waynoka, Oklahoma
  8. 2.1 7 km SW of Waynoka, Oklahoma
  9. 2.5 5 km W of Alva, Oklahoma
  10. 3.4 Oklahoma
  11. 2.5 16 km SE of Waynoka, Oklahoma
  12. 3.1 15 km WNW of Alva, Oklahoma
  13. 3.1 15 km SSE of Waynoka, Oklahoma
  14. 2.8 9 km WSW of Waynoka, Oklahoma
  15. 2.7 13 km SE 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 4,000 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.