Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Madisonville, TN
No earthquake was likely felt in Madisonville in the 24 hours to 8:11 am EST (13:11 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 1.9 earthquake was recorded 14 km (9 mi) south-southeast of Madisonville, TN, at 2:32 am EST on 28 December 2017 (07:32 UTC), 13 km deep.
USGS: 4 km NW of Tellico Plains, Tennessee
72 km (45 mi) SSW of Knoxville, TN · 55 km (34 mi) ENE of Cleveland, TN
- When
- 2:32 am EST on 28 December 2017 ()
- Where
- 14 km (9 mi) south-southeast of Madisonville, TN · earthquakes near Madisonville
- Magnitude
- M 1.9 (md)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Monroe County, 9 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3240 days ago
Earthquake alerts for Madisonville, TN
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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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 18 km (11 mi) from the epicentre. In Madisonville, 14 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: Etowah, Vonore, Athens, Sweetwater.
How big was it?
This earthquake released about 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
- Magna, Utah 2020 M 5.7 440,000× the energy of this one
- Around the size people start to feel M 3.0 39× the energy of this one
- This earthquake M 1.9 about 25 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
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 35.3963, -84.3228. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Monroe County, TN | 9 km (5 mi) | NE | earthquakes near Monroe County |
| McMinn County, TN | 27 km (17 mi) | W | earthquakes near McMinn County |
| Cherokee County, NC | 37 km (23 mi) | SE | earthquakes near Cherokee County |
| Polk County, TN | 38 km (23 mi) | SSW | earthquakes near Polk County |
| Loudon County, TN | 38 km (23 mi) | N | earthquakes near Loudon County |
| Graham County, NC | 45 km (28 mi) | E | earthquakes near Graham County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.7 2 km NE of Tellico Village, Tennessee
- 2.1 2 km ESE of Tellico Village, Tennessee
- 2.2 2 km ESE of Tellico Village, Tennessee
- 2.3 1 km E of Tellico Village, Tennessee
- 1.7 3 km S of Huntsville, Tennessee
- 1.7 1 km N of Decatur, Tennessee
- 2.3 2 km NE of Tellico Village, Tennessee
- 1.7 1 km N of Huntsville, Tennessee
- 1.7 11 km NNE of Decatur, Tennessee
- 2.8 13 km SE of Vonore, Tennessee
- 2.2 2 km SSE of Englewood, Tennessee
- 2.1 2 km SSE of Englewood, Tennessee
- 2.1 12 km NNE of Decatur, TN
- 2.1 11 km NNE of Decatur, Tennessee
- 1.8 10 km NNE of Decatur, 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.