QuakeIndex

other event · reviewed by a seismologist

M 3.0mb_lg

5 km S of Knoxville, Iowa

· 0.0 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 7 kmLucas County 33 kmMonroe County 33 kmMahaska County 39 kmWarren County 40 kmJasper County 47 kmPolk County 61 kmAppanoose County 61 kmWayne County 62 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 3.0 (mb_lg)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Marion County, 7 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 52 days ago

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

USGS catalogues this as other event, not an earthquake.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 41.2675, -93.0986. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, IA 7 km (4 mi) S of here earthquakes near Marion County
Lucas County, IA 33 km (20 mi) NE of here earthquakes near Lucas County
Monroe County, IA 33 km (20 mi) NW of here earthquakes near Monroe County
Mahaska County, IA 39 km (24 mi) W of here earthquakes near Mahaska County
Warren County, IA 40 km (25 mi) E of here earthquakes near Warren County
Jasper County, IA 47 km (29 mi) S of here earthquakes near Jasper County

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

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

  1. 2.5 10 km WNW of Marysville, Iowa

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.