QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

5 km N of Alex, Oklahoma

· 7.1 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grady County 12 kmMcClain County 30 kmCleveland County 49 kmGarvin County 51 kmStephens County 54 kmCaddo County 59 kmCanadian County 67 kmComanche County 72 kmOklahoma 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 1.9 (ml)
Depth
7.1 km below the surface
Felt
no reports yet
Nearest
Grady County, 12 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2526 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 34.9663, -97.7778. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grady County, OK 12 km (7 mi) ESE of here earthquakes near Grady County
McClain County, OK 30 km (19 mi) W of here earthquakes near McClain County
Cleveland County, OK 49 km (31 mi) WSW of here earthquakes near Cleveland County
Garvin County, OK 51 km (32 mi) NW of here earthquakes near Garvin County
Stephens County, OK 54 km (34 mi) N of here earthquakes near Stephens County
Caddo County, OK 59 km (37 mi) ESE of here earthquakes near Caddo County

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

Aftershocks so far

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

  1. 1.8 10 km WSW of Blanchard, Oklahoma
  2. 2.1 10 km WSW of Blanchard, Oklahoma
  3. 1.8 8 km NE of Alex, Oklahoma
  4. 2.1 6 km WSW of Minco, Oklahoma
  5. 2.2 8 km NE of Alex, Oklahoma
  6. 3.0 8 km NE of Alex, Oklahoma
  7. 2.1 9 km NE of Alex, Oklahoma
  8. 1.5 8 km NE of Alex, Oklahoma
  9. 1.8 Oklahoma
  10. 2.0 10 km WSW of Blanchard, Oklahoma
  11. 1.6 7 km NE of Alex, Oklahoma
  12. 2.0 8 km NE of Alex, Oklahoma
  13. 2.1 8 km NE of Alex, Oklahoma
  14. 2.3 8 km NE of Alex, Oklahoma
  15. 1.8 8 km NE of Alex, 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.