QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5mb_lg

10 km N of Platte, South Dakota

· 5.0 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Brule County 34 kmAurora County 34 kmCharles Mix County 37 kmDouglas County 41 kmGregory County 45 kmDavison County 60 kmBoyd County 66 kmJerauld County 67 kmBuffalo County 69 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 2.5 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Brule County, 34 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2157 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 43.4836, -98.8464. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Brule County, SD 34 km (21 mi) SE of here earthquakes near Brule County
Aurora County, SD 34 km (21 mi) SW of here earthquakes near Aurora County
Charles Mix County, SD 37 km (23 mi) NNW of here earthquakes near Charles Mix County
Douglas County, SD 41 km (25 mi) WNW of here earthquakes near Douglas County
Gregory County, SD 45 km (28 mi) NE of here earthquakes near Gregory County
Davison County, SD 60 km (37 mi) WSW of here earthquakes near Davison 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. 2.5 9 km NE of Plankinton, South Dakota

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.