QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3mb_lg

9 km N of Harper, Kansas

· 6.6 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 21 kmKingman County 23 kmSumner County 48 kmSedgwick County 60 kmBarber County 62 kmReno County 64 kmGrant County 68 kmPratt County 71 kmAlfalfa County 76 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 3.3 (mb_lg)
Depth
6.6 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Harper County, 21 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3677 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 37.3709, -98.0114. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 21 km (13 mi) NNE of here earthquakes near Harper County
Kingman County, KS 23 km (15 mi) SSE of here earthquakes near Kingman County
Sumner County, KS 48 km (30 mi) WNW of here earthquakes near Sumner County
Sedgwick County, KS 60 km (37 mi) SW of here earthquakes near Sedgwick County
Barber County, KS 62 km (38 mi) ENE of here earthquakes near Barber County
Reno County, KS 64 km (40 mi) S of here earthquakes near Reno County

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

Aftershocks so far

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

  1. 2.1 3 km ENE of Freeport, Kansas
  2. 2.1 3 km ENE of Freeport, Kansas
  3. 1.6 6 km ENE of Milan, Kansas
  4. 1.6 6 km ENE of Milan, Kansas
  5. 1.9 6 km WNW of Mayfield, Kansas
  6. 1.6 11 km ENE of Bluff City, Kansas
  7. 1.7 5 km E of Manchester, Oklahoma
  8. 1.8 5 km NNE of Bluff City, Kansas
  9. 2.0 5 km NNE of Bluff City, Kansas
  10. 2.0 1 km NNE of Manchester, Oklahoma
  11. 1.8 9 km SE of Bluff City, Kansas
  12. 2.3 9 km SE of Bluff City, Kansas
  13. 1.6 2 km E of Anthony, Kansas
  14. 2.2 2 km SE of Milan, Kansas
  15. 2.6 6 km N 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.

On USGS

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