QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

9 km WSW of Blanchard, Oklahoma

· 2.9 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 15 kmMcClain County 28 kmCleveland County 40 kmCanadian County 54 kmGarvin County 58 kmCaddo County 58 kmOklahoma County 60 kmStephens County 69 kmPottawatomie County 73 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 (ml)
Depth
2.9 km below the surface
Felt
17 reports · strongest reported intensity V
Nearest
Grady County, 15 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3538 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 17 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 35.0947, -97.7460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 15 km (9 mi) ENE of here earthquakes near Grady County
McClain County, OK 28 km (18 mi) WNW of here earthquakes near McClain County
Cleveland County, OK 40 km (25 mi) WSW of here earthquakes near Cleveland County
Canadian County, OK 54 km (34 mi) SSE of here earthquakes near Canadian County
Garvin County, OK 58 km (36 mi) NW of here earthquakes near Garvin County
Caddo County, OK 58 km (36 mi) E of here earthquakes near Caddo County

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

Aftershocks so far

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

  1. 2.5 15 km W of Union City, Oklahoma
  2. 2.6 15 km W of Union City, Oklahoma
  3. 2.2 6 km SSW of Yukon, Oklahoma
  4. 2.5 15 km W of Union City, Oklahoma
  5. 2.5 15 km W of Union City, Oklahoma
  6. 2.7 5 km SSW of Yukon, Oklahoma
  7. 2.4 14 km W of Union City, Oklahoma
  8. 1.9 6 km SSW of Yukon, Oklahoma
  9. 2.1 6 km S of Yukon, Oklahoma
  10. 2.3 6 km SSW of Yukon, Oklahoma
  11. 2.5 Oklahoma
  12. 2.6 16 km W of Union City, Oklahoma
  13. 2.6 6 km SSW of Yukon, Oklahoma
  14. 2.7 15 km W of Union City, Oklahoma
  15. 2.7 15 km W of Union City, 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.