QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mwr

10 km NE of Anoka, Nebraska

· 5.0 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boyd County 13 kmCharles Mix County 25 kmGregory County 43 kmDouglas County 52 kmHolt County 61 kmBon Homme County 69 kmKnox County 80 kmAurora County 81 kmKeya Paha 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 (mwr)
Depth
5.0 km below the surface
Felt
64 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Boyd County, 13 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1860 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 64 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 43.0080, -98.7332. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boyd County, NE 13 km (8 mi) NNE of here earthquakes near Boyd County
Charles Mix County, SD 25 km (15 mi) SSW of here earthquakes near Charles Mix County
Gregory County, SD 43 km (27 mi) ESE of here earthquakes near Gregory County
Douglas County, SD 52 km (33 mi) SW of here earthquakes near Douglas County
Holt County, NE 61 km (38 mi) N of here earthquakes near Holt County
Bon Homme County, SD 69 km (43 mi) W of here earthquakes near Bon Homme County

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

Aftershocks so far

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

  1. 2.5 9 km NE of Burke, South Dakota
  2. 3.1 9 km ENE of Anoka, Nebraska

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.