QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8mb_lg

5 km SSW of Norwich, Kansas

· 5.0 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kingman County 29 kmHarper County 30 kmSumner County 39 kmSedgwick County 47 kmReno County 62 kmGrant County 70 kmBarber County 75 kmHarvey County 81 kmPratt County 81 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 2.8 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Kingman County, 29 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2881 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 37.4110, -97.8707. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kingman County, KS 29 km (18 mi) ESE of here earthquakes near Kingman County
Harper County, KS 30 km (19 mi) NE of here earthquakes near Harper County
Sumner County, KS 39 km (24 mi) WNW of here earthquakes near Sumner County
Sedgwick County, KS 47 km (29 mi) SW of here earthquakes near Sedgwick County
Reno County, KS 62 km (39 mi) SSE of here earthquakes near Reno County
Grant County, OK 70 km (43 mi) N of here earthquakes near Grant County

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

Aftershocks so far

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

  1. 1.7 11 km SE of Mayfield, Kansas
  2. 2.8 11 km SE of Mayfield, Kansas
  3. 2.8 11 km SE of Mayfield, Kansas
  4. 2.2 11 km SE of Mayfield, Kansas
  5. 1.7 11 km SE of Mayfield, Kansas
  6. 2.3 11 km SE of Mayfield, Kansas
  7. 2.1 5 km W of Danville, Kansas
  8. 2.0 5 km W of Danville, Kansas
  9. 2.3 6 km NNE of Danville, Kansas
  10. 1.6 6 km NNW of Argonia, Kansas
  11. 2.1 2 km SSE of Bluff City, Kansas
  12. 2.4 8 km NNE of Harper, Kansas
  13. 3.1 7 km NE of Harper, Kansas
  14. 1.6 11 km N of Caldwell, Kansas
  15. 1.5 7 km S of Argonia, 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

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