QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

3 km NNW of Freeport, Kansas

· 4.3 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 18 kmSumner County 33 kmKingman County 44 kmGrant County 49 kmSedgwick County 62 kmAlfalfa County 68 kmBarber County 72 kmKay County 79 kmReno County 82 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 3.7 (ml)
Depth
4.3 km below the surface
Felt
14 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Harper County, 18 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3348 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 37.2278, -97.8698. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 18 km (11 mi) ENE of here earthquakes near Harper County
Sumner County, KS 33 km (21 mi) W of here earthquakes near Sumner County
Kingman County, KS 44 km (27 mi) SE of here earthquakes near Kingman County
Grant County, OK 49 km (31 mi) N of here earthquakes near Grant County
Sedgwick County, KS 62 km (39 mi) SW of here earthquakes near Sedgwick County
Alfalfa County, OK 68 km (43 mi) NE of here earthquakes near Alfalfa 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. 3.7 6 km SSE of Harper, Kansas
  2. 1.6 2 km NNE of Bluff City, Kansas
  3. 2.0 10 km WNW of Caldwell, Kansas
  4. 1.6 10 km WNW of Caldwell, Kansas
  5. 1.7 5 km E of Caldwell, Kansas
  6. 2.0 7 km SSE of Harper, Kansas
  7. 1.7 9 km W of Bluff City, Kansas
  8. 1.9 3 km WSW of Anthony, Kansas
  9. 2.7 4 km W of Renfrow, Oklahoma
  10. 2.5 6 km SSE of Harper, Kansas
  11. 1.5 7 km SE of Conway Springs, Kansas
  12. 1.6 6 km SSE of Harper, Kansas
  13. 2.3 11 km SSW of Wellington, Kansas
  14. 2.5 9 km WNW of Belle Plaine, Kansas
  15. 2.4 8 km WNW of Belle Plaine, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-11-25 — it released about 2.8 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.