QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

9 km SW of Shamrock, Oklahoma

· 7.3 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Creek County 26 kmLincoln County 26 kmPayne County 39 kmOkfuskee County 52 kmPawnee County 52 kmOkmulgee County 66 kmTulsa County 71 kmLogan County 72 kmOklahoma County 75 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
7.3 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Creek County, 26 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2607 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 35.8475, -96.6558. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Creek County, OK 26 km (16 mi) WSW of here earthquakes near Creek County
Lincoln County, OK 26 km (16 mi) NE of here earthquakes near Lincoln County
Payne County, OK 39 km (24 mi) SE of here earthquakes near Payne County
Okfuskee County, OK 52 km (32 mi) NW of here earthquakes near Okfuskee County
Pawnee County, OK 52 km (32 mi) S of here earthquakes near Pawnee County
Okmulgee County, OK 66 km (41 mi) WNW of here earthquakes near Okmulgee County

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

Aftershocks so far

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

  1. 2.9 8 km NW of Prague, Oklahoma
  2. 1.8 7 km E of Meeker, Oklahoma
  3. 1.7 5 km SW of Drumright, Oklahoma
  4. 1.7 5 km N of Stroud, Oklahoma
  5. 1.8 2 km SE of Carney, Oklahoma
  6. 1.7 6 km SE of Cushing, Oklahoma
  7. 1.6 9 km SW of Shamrock, Oklahoma
  8. 1.5 6 km SE of Cushing, Oklahoma
  9. 1.9 3 km SE of Carney, OK
  10. 1.8 3 km WNW of Cushing, Oklahoma
  11. 2.7 2 km WNW of Cushing, Oklahoma
  12. 1.8 3 km WNW of Cushing, Oklahoma
  13. 1.6 2 km SE of Carney, Oklahoma
  14. 1.5 5 km N of Stroud, Oklahoma
  15. 1.7 5 km N of Stroud, 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 5.0 on 2016-11-07 — it released about 24,000 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.