QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km WNW of Renfrow, Oklahoma

· 2.8 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 20 kmSumner County 37 kmHarper County 41 kmKay County 53 kmAlfalfa County 60 kmGarfield County 64 kmNoble County 76 kmKingman County 77 kmCowley County 84 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
2.8 km below the surface
Felt
no reports yet
Nearest
Grant County, 20 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2774 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 36.9542, -97.7143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 20 km (12 mi) NNE of here earthquakes near Grant County
Sumner County, KS 37 km (23 mi) SSW of here earthquakes near Sumner County
Harper County, KS 41 km (25 mi) SE of here earthquakes near Harper County
Kay County, OK 53 km (33 mi) WNW of here earthquakes near Kay County
Alfalfa County, OK 60 km (37 mi) ENE of here earthquakes near Alfalfa County
Garfield County, OK 64 km (40 mi) N of here earthquakes near Garfield 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 2 km SE of Milan, Kansas
  2. 1.8 7 km N of Nardin, Oklahoma
  3. 1.9 7 km N of Nardin, Oklahoma
  4. 1.6 6 km NNW of Nardin, Oklahoma
  5. 1.9 8 km N of Nardin, Oklahoma
  6. 2.6 7 km NNW of Medford, Oklahoma
  7. 2.0 8 km N of Nardin, Oklahoma
  8. 1.5 4 km WNW of Danville, Kansas
  9. 2.5 7 km NNW of Medford, Oklahoma
  10. 1.8 9 km W of Bluff City, Kansas
  11. 1.7 7 km ENE of Bluff City, Kansas
  12. 2.4 2 km ENE of Medford, Oklahoma
  13. 1.8 9 km W of Bluff City, Kansas
  14. 2.1 5 km NNE of Medford, Oklahoma
  15. 2.5 9 km W of Bluff City, Kansas

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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2018-06-09 — it released about 9,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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