Earthquake · reviewed by a seismologist
M 2.7mb_lg
12 km S of Martin, South Dakota
- When
- Magnitude
- M 2.7 (mb_lg)
- Depth
- 9.4 km below the surface
- Felt
- no reports yet
- Nearest
- Bennett County, 14 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 942 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
- Magna, Utah 2020 M 5.7 32,000× the energy of this one
- Around the size people start to feel M 3.0 2.8× the energy of this one
- This earthquake M 2.7 about 340 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 43.0622, -101.7177. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Bennett County, SD | 14 km (9 mi) | SSW of here | earthquakes near Bennett County |
| Jackson County, SD | 69 km (43 mi) | S of here | earthquakes near Jackson County |
| Oglala Lakota County, SD | 75 km (46 mi) | ESE of here | earthquakes near Oglala Lakota County |
| Cherry County, NE | 77 km (48 mi) | NW of here | earthquakes near Cherry County |
| Sheridan County, NE | 81 km (50 mi) | NE of here | earthquakes near Sheridan County |
| Todd County, SD | 84 km (52 mi) | W of here | earthquakes near Todd 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.
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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.