QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8mb_lg

4 km E of Blanchard, Oklahoma

· 6.8 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N McClain County 20 kmCleveland County 27 kmGrady County 29 kmOklahoma County 50 kmGarvin County 55 kmCanadian County 56 kmPottawatomie County 60 kmCaddo County 70 kmStephens County 77 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 2.8 (mb_lg)
Depth
6.8 km below the surface
Felt
11 reports · strongest reported intensity II
Nearest
McClain County, 20 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2683 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 35.1395, -97.6069. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
McClain County, OK 20 km (12 mi) NW of here earthquakes near McClain County
Cleveland County, OK 27 km (17 mi) WSW of here earthquakes near Cleveland County
Grady County, OK 29 km (18 mi) ENE of here earthquakes near Grady County
Oklahoma County, OK 50 km (31 mi) SSW of here earthquakes near Oklahoma County
Garvin County, OK 55 km (34 mi) NNW of here earthquakes near Garvin County
Canadian County, OK 56 km (35 mi) SE of here earthquakes near Canadian County

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

Aftershocks so far

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

  1. 1.9 5 km SE of Chickasha, Oklahoma
  2. 1.5 3 km WNW of Bridge Creek, Oklahoma
  3. 1.9 1 km W of Bridge Creek, Oklahoma
  4. 1.6 1 km WNW of Bridge Creek, Oklahoma
  5. 1.7 6 km SW of Minco, Oklahoma
  6. 2.2 6 km NNE of Bridge Creek, Oklahoma
  7. 2.0 1 km WNW of Bridge Creek, Oklahoma
  8. 1.6 0 km N of Bridge Creek, Oklahoma
  9. 2.3 0 km WNW of Bridge Creek, Oklahoma
  10. 1.7 0 km N of Bridge Creek, Oklahoma
  11. 1.7 6 km WNW of Dibble, Oklahoma
  12. 1.6 3 km SE of Minco, Oklahoma
  13. 2.2 Oklahoma
  14. 2.2 6 km W of Wayne, Oklahoma
  15. 2.3 6 km W of Wayne, 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.