QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km SW of Manchester, Oklahoma

· 7.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 26 kmGrant County 32 kmAlfalfa County 33 kmSumner County 60 kmBarber County 62 kmKingman County 67 kmGarfield County 69 kmWoods County 75 kmMajor County 83 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
7.0 km below the surface
Felt
no reports yet
Nearest
Harper County, 26 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2043 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 36.9568, -98.0763. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 26 km (16 mi) S of here earthquakes near Harper County
Grant County, OK 32 km (20 mi) NW of here earthquakes near Grant County
Alfalfa County, OK 33 km (21 mi) NE of here earthquakes near Alfalfa County
Sumner County, KS 60 km (37 mi) WSW of here earthquakes near Sumner County
Barber County, KS 62 km (38 mi) ESE of here earthquakes near Barber County
Kingman County, KS 67 km (41 mi) S of here earthquakes near Kingman 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. 1.7 7 km E of Pond Creek, Oklahoma
  2. 1.9 1 km NW of Kremlin, Oklahoma
  3. 1.5 8 km E of Nescatunga, Oklahoma
  4. 1.8 10 km W of Lamont, Oklahoma
  5. 2.0 3 km E of Jet, Oklahoma
  6. 1.6 9 km W of Lamont, Oklahoma
  7. 1.8 10 km W of Lamont, Oklahoma
  8. 2.0 10 km W of Lamont, Oklahoma
  9. 1.7 10 km W of Lamont, Oklahoma
  10. 1.5 10 km W of Lamont, Oklahoma
  11. 1.5 8 km SSE of Byron, Oklahoma
  12. 3.0 7 km NNE of Manchester, Oklahoma
  13. 1.7 4 km SW of Lambert, Oklahoma
  14. 1.6 4 km SW of Lambert, Oklahoma
  15. 1.7 4 km SW of Lambert, 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 4.4 on 2019-05-17 — it released about 7,200 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.