Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Madisonville, TN
No earthquake was likely felt in Madisonville in the 24 hours to 6:58 pm EST (23:58 UTC). The last one was M 1.9, 14 km (8 mi) NNE, at 6:50 am EDT on 12 October 2026, estimated intensity II (weak) in town. Every earthquake near Madisonville
This page: a magnitude 1.5 earthquake was recorded 3 km (2 mi) north-northwest of Madisonville, TN, at 12:49 am EST on 21 February 2024 (05:49 UTC), 14 km deep.
USGS: 2 km NNW of Madisonville, Tennessee
61 km (38 mi) SW of Knoxville, TN
- When
- 12:49 am EST on 21 February 2024 ()
- Where
- 3 km (2 mi) north-northwest of Madisonville, TN · earthquakes near Madisonville
- Magnitude
- M 1.5 (md)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Monroe County, 16 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 994 days ago
Earthquake alerts for Madisonville, TN
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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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. In Madisonville, 3 km away, the estimate is intensity II (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: Sweetwater, Vonore, Tellico Village, Loudon, Athens, Greenback.
How big was it?
This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.7 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.
For this area
The largest earthquake within 50 km since 2016 was M 4.4 on 2018-12-12 — about 21,000 times the energy of this one.
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 35.5408, -84.3773. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Monroe County, TN | 16 km (10 mi) | SE | earthquakes near Monroe County |
| Loudon County, TN | 22 km (14 mi) | NNE | earthquakes near Loudon County |
| McMinn County, TN | 25 km (16 mi) | WSW | earthquakes near McMinn County |
| Roane County, TN | 37 km (23 mi) | NNW | earthquakes near Roane County |
| Meigs County, TN | 40 km (25 mi) | W | earthquakes near Meigs County |
| Blount County, TN | 44 km (27 mi) | ENE | earthquakes near Blount County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.8 2 km S of Niota, Tennessee
- 1.8 13 km ESE of Tellico Plains, Tennessee
- 2.1 0 km S of Loudon, Tennessee
- 1.9 2 km NE of Niota, Tennessee
- 4.1 21 km SE of Greenback, Tennessee
- 2.0 5 km NE of Tellico Plains, Tennessee
- 1.6 6 km NW of Madisonville, Tennessee
- 1.6 3 km ENE of Sweetwater, Tennessee
- 2.1 12 km E of Benton, Tennessee
- 1.6 7 km WSW of Tellico Village, Tennessee
- 2.0 6 km SSE of Vonore, Tennessee
- 1.7 7 km ESE of Sweetwater, Tennessee
- 1.8 7 km ESE of Sweetwater, Tennessee
- 1.8 5 km S of Louisville, Tennessee
- 1.8 6 km SSE of Sweetwater, Tennessee
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.