QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

3 km SW of Armstrong, Oklahoma

· 5.0 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bryan County 12 kmMarshall County 37 kmJohnston County 41 kmAtoka County 51 kmGrayson County 53 kmFannin County 54 kmCoal County 62 kmChoctaw County 75 kmLove County 81 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 1.7 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Bryan County, 12 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 339 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 34.0278, -96.3668. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bryan County, OK 12 km (7 mi) NW of here earthquakes near Bryan County
Marshall County, OK 37 km (23 mi) E of here earthquakes near Marshall County
Johnston County, OK 41 km (26 mi) SE of here earthquakes near Johnston County
Atoka County, OK 51 km (31 mi) SW of here earthquakes near Atoka County
Grayson County, TX 53 km (33 mi) NNE of here earthquakes near Grayson County
Fannin County, TX 54 km (34 mi) NNW of here earthquakes near Fannin County

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

Aftershocks so far

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

  1. 1.5 9 km SSE of Wapanucka, Oklahoma
  2. 1.5 6 km SSE of Tishomingo, Oklahoma
  3. 1.6 10 km SSE of Wapanucka, Oklahoma
  4. 1.5 9 km SSE of Wapanucka, Oklahoma
  5. 1.5 4 km W of Durant, Oklahoma
  6. 1.6 2 km NNW of Durant, Oklahoma
  7. 1.7 1 km WSW of Durant, Oklahoma
  8. 2.0 2 km SW of Durant, Oklahoma
  9. 2.4 4 km WSW of Durant, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.