Earthquake · reviewed by a seismologist
M 3.1mb_lg
Earthquake near Tyndall, SD
No earthquake was likely felt in Tyndall in the 24 hours to 7:50 am CST (13:50 UTC). The last one was M 3.7, 286 km (178 mi) NW, at 2:39 pm CDT on 30 May 2024, estimated intensity II (weak) in town; 485 felt reports to USGS. Every earthquake near Tyndall
This page: a magnitude 3.1 earthquake was recorded 6 km (3 mi) north of Tyndall, SD, at 8:55 am CST on 4 January 2021 (14:55 UTC), 5.0 km deep. 55 people have reported feeling it to USGS.
USGS: 5 km N of Tyndall, South Dakota
- When
- 8:55 am CST on 4 January 2021 ()
- Where
- 6 km (3 mi) north of Tyndall, SD · earthquakes near Tyndall
- Magnitude
- M 3.1 (mb_lg)
- Depth
- 5.0 km below the surface
- Felt
- 55 reports · strongest reported intensity III
- Nearest
- Bon Homme County, 7 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2071 days ago
Earthquake alerts for Tyndall, SD
Get a notification in this browser when USGS records an earthquake near Tyndall, SD. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 128 km (80 mi) from the epicentre. In Tyndall, 6 km away, the estimate is intensity III (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Springfield.
How big was it?
This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 250,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,900× the energy of this one
- This earthquake M 3.1 about 1,300 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.4× 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.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 43.0433, -97.8633. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Bon Homme County, SD | 7 km (4 mi) | SSW | earthquakes near Bon Homme County |
| Hutchinson County, SD | 34 km (21 mi) | NNE | earthquakes near Hutchinson County |
| Yankton County, SD | 39 km (24 mi) | E | earthquakes near Yankton County |
| Knox County, NE | 46 km (28 mi) | S | earthquakes near Knox County |
| Douglas County, SD | 56 km (35 mi) | NW | earthquakes near Douglas County |
| Charles Mix County, SD | 62 km (39 mi) | WNW | earthquakes near Charles Mix 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.