Earthquake · reviewed by a seismologist
M 3.6ml
7 km W of Fairburn, South Dakota
- When
- Magnitude
- M 3.6 (ml)
- Depth
- 5.0 km below the surface
- Felt
- 7 reports · strongest reported intensity III
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Custer County, 13 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 499 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.
How big was it?
This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 45,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400× the energy of this one
- This earthquake M 3.6 about 3.8 tons of TNT
- Around the size people start to feel M 3.0 this one released 7.9× 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 43.6761, -103.3000. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Custer County, SD | 13 km (8 mi) | E of here | earthquakes near Custer County |
| Pennington County, SD | 53 km (33 mi) | SW of here | earthquakes near Pennington County |
| Fall River County, SD | 53 km (33 mi) | NNE of here | earthquakes near Fall River County |
| Oglala Lakota County, SD | 71 km (44 mi) | WNW of here | earthquakes near Oglala Lakota County |
| Lawrence County, SD | 85 km (53 mi) | SSE of here | earthquakes near Lawrence County |
| Weston County, WY | 104 km (64 mi) | E of here | earthquakes near Weston County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have 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.