QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

3 km E of Freeport, Kansas

· 5.6 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Harper County 23 kmSumner County 29 kmGrant County 46 kmKingman County 49 kmSedgwick County 62 kmAlfalfa County 69 kmKay County 73 kmBarber County 77 kmReno County 86 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 (ml)
Depth
5.6 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Harper County, 23 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2984 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

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 37.2028, -97.8128. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Harper County, KS 23 km (14 mi) E of here earthquakes near Harper County
Sumner County, KS 29 km (18 mi) W of here earthquakes near Sumner County
Grant County, OK 46 km (29 mi) N of here earthquakes near Grant County
Kingman County, KS 49 km (30 mi) SE of here earthquakes near Kingman County
Sedgwick County, KS 62 km (38 mi) SSW of here earthquakes near Sedgwick County
Alfalfa County, OK 69 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

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

  1. 1.6 3 km SSE of Milan, Kansas
  2. 2.8 5 km NE of Medford, Oklahoma
  3. 3.3 5 km NE of Medford, Oklahoma
  4. 1.6 Kansas
  5. 1.9 12 km SSE of Milan, Kansas
  6. 2.0 5 km SE of Freeport, Kansas
  7. 1.9 3 km WSW of Bluff City, Kansas
  8. 1.5 3 km WSW of Bluff City, Kansas
  9. 1.9 6 km ENE of Harper, Kansas
  10. 1.6 4 km NNW of Bluff City, Kansas
  11. 1.6 6 km WNW of Danville, Kansas
  12. 3.1 5 km NE of Medford, Oklahoma
  13. 3.4 8 km WSW of Hunnewell, Kansas
  14. 1.6 2 km SSE of Freeport, Kansas
  15. 2.0 3 km WSW of Bluff City, 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 4.1 on 2017-03-29 — it released about 89 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.