QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km NNW of Harper, Kansas

· 8.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 17 kmKingman County 25 kmSumner County 51 kmBarber County 57 kmSedgwick County 65 kmGrant County 66 kmReno County 68 kmPratt County 69 kmAlfalfa County 72 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
8.0 km below the surface
Felt
no reports yet
Nearest
Harper County, 17 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2903 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 37.3412, -98.0575. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 17 km (11 mi) N of here earthquakes near Harper County
Kingman County, KS 25 km (15 mi) SSE of here earthquakes near Kingman County
Sumner County, KS 51 km (32 mi) WNW of here earthquakes near Sumner County
Barber County, KS 57 km (35 mi) ENE of here earthquakes near Barber County
Sedgwick County, KS 65 km (40 mi) SW of here earthquakes near Sedgwick County
Grant County, OK 66 km (41 mi) NNW of here earthquakes near Grant 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. 2.5 6 km NW of Danville, Kansas
  2. 1.6 4 km ENE of Freeport, Kansas
  3. 1.9 5 km NNW of Mayfield, Kansas
  4. 1.8 4 km NW of Danville, Kansas
  5. 2.8 2 km WNW of Danville, Kansas
  6. 1.6 6 km SE of Freeport, Kansas
  7. 2.1 1 km WNW of Argonia, Kansas
  8. 1.5 7 km ENE of Bluff City, Kansas
  9. 1.9 2 km SSE of Bluff City, Kansas
  10. 1.6 3 km ENE of Freeport, Kansas
  11. 1.8 3 km E of Freeport, Kansas
  12. 2.2 7 km N of Wakita, Oklahoma
  13. 1.5 7 km ENE of Bluff City, Kansas
  14. 1.8 4 km WNW of Danville, Kansas
  15. 2.1 1 km ESE of Hazelton, 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.

On USGS

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