QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11 km SW of Blanchard, Oklahoma

· 7.6 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 13 kmMcClain County 28 kmCleveland County 42 kmCanadian County 56 kmGarvin County 57 kmCaddo County 58 kmOklahoma County 62 kmStephens County 66 kmPottawatomie County 74 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 1.8 (ml)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Grady County, 13 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2407 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 35.0700, -97.7542. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 13 km (8 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 42 km (26 mi) WSW of here earthquakes near Cleveland County
Canadian County, OK 56 km (35 mi) SSE of here earthquakes near Canadian County
Garvin County, OK 57 km (35 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

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

  1. 1.8 4 km WNW of Minco, Oklahoma
  2. 1.9 2 km WSW of Minco, Oklahoma
  3. 1.7 4 km WNW of Minco, Oklahoma
  4. 2.3 3 km W of Minco, Oklahoma
  5. 1.5 4 km WNW of Minco, Oklahoma
  6. 1.8 6 km SW of Blanchard, Oklahoma
  7. 1.8 6 km WSW of Blanchard, Oklahoma
  8. 1.6 8 km WSW of Blanchard, Oklahoma
  9. 1.6 6 km SW of Blanchard, Oklahoma
  10. 1.6 6 km WSW of Blanchard, Oklahoma
  11. 1.5 6 km WSW of Blanchard, Oklahoma
  12. 1.6 7 km WSW of Blanchard, Oklahoma
  13. 1.6 8 km SW of Dibble, Oklahoma
  14. 1.9 7 km NE of Alex, Oklahoma
  15. 1.6 10 km NNW of Maysville, 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

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