QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km SSE of Manchester, Oklahoma

· 6.4 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 26 kmHarper County 29 kmAlfalfa County 36 kmSumner County 57 kmGarfield County 65 kmBarber County 68 kmKingman County 70 kmKay County 78 kmWoods County 79 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
6.4 km below the surface
Felt
no reports yet
Nearest
Grant County, 26 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 915 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 36.9343, -98.0125. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 26 km (16 mi) NW of here earthquakes near Grant County
Harper County, KS 29 km (18 mi) S of here earthquakes near Harper County
Alfalfa County, OK 36 km (22 mi) NE of here earthquakes near Alfalfa County
Sumner County, KS 57 km (35 mi) SW of here earthquakes near Sumner County
Garfield County, OK 65 km (40 mi) NNW of here earthquakes near Garfield County
Barber County, KS 68 km (42 mi) ESE of here earthquakes near Barber County

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

Aftershocks so far

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

  1. 1.5 8 km NNE of Nash, Oklahoma
  2. 2.4 3 km ENE of Medford, Oklahoma
  3. 1.5 4 km NE of Medford, Oklahoma
  4. 1.9 8 km NNW of Deer Creek, Oklahoma
  5. 1.8 9 km SSE of Byron, Oklahoma
  6. 2.4 1 km SE of Danville, Kansas
  7. 2.6 5 km WSW of Danville, Kansas
  8. 1.8 4 km NE of Cherokee, Oklahoma
  9. 1.7 5 km N of Cherokee, Oklahoma
  10. 2.0 5 km WSW of Kremlin, Oklahoma
  11. 2.3 8 km E of Nescatunga, Oklahoma
  12. 1.9 9 km ESE of Jefferson, Oklahoma
  13. 1.6 12 km SSE of Waldron, Kansas
  14. 2.2 12 km ENE of Nescatunga, Oklahoma
  15. 2.3 8 km SE of Wakita, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2022-01-31 — it released about 10,000 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.