Earthquake · reviewed by a seismologist
M 4.1mw
Earthquake near Greenback, TN
No earthquake was likely felt in Greenback in the 24 hours to 3:25 am EST (08:25 UTC). The last one was M 2.4, 27 km (17 mi) NW, at 1:54 am EDT on 30 October 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Greenback
This page: a magnitude 4.1 earthquake was recorded 21 km (13 mi) southeast of Greenback, TN, at 9:04 am EDT on 10 May 2025 (13:04 UTC), 25 km deep. 45,935 people have reported feeling it to USGS.
USGS: 21 km SE of Greenback, Tennessee
47 km (29 mi) S of Knoxville, TN
- When
- 9:04 am EDT on 10 May 2025 ()
- Where
- 21 km (13 mi) southeast of Greenback, TN · earthquakes near Greenback
- Magnitude
- M 4.1 (mw)
- Depth
- 25 km below the surface
- Felt
- 45,935 reports · strongest reported intensity V
- Measured shaking
- intensity V (ShakeMap)
- USGS impact alert
- green
- Nearest
- Blount County, 17 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 96 days ago
Earthquake alerts for Greenback, TN
Get a notification in this browser when USGS records an earthquake near Greenback, TN. 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 490 km (304 mi) from the epicentre. In Greenback, 21 km away, the estimate is intensity IV (light). 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.
Likely felt in: Maryville 24 km, intensity IV · Farragut 41 km, intensity III · Seymour 45 km, intensity III · Knoxville 47 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 7,900× the energy of this one
- Mineral, Virginia 2011 M 5.8 350× the energy of this one
- Magna, Utah 2020 M 5.7 250× the energy of this one
- This earthquake M 4.1 about 21 tons of TNT
- Around the size people start to feel M 3.0 this one released 45× 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
The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.
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 35.5450, -83.9868. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Blount County, TN | 17 km (11 mi) | NNE | earthquakes near Blount County |
| Graham County, NC | 26 km (16 mi) | SSE | earthquakes near Graham County |
| Monroe County, TN | 26 km (16 mi) | WSW | earthquakes near Monroe County |
| Loudon County, TN | 36 km (23 mi) | NW | earthquakes near Loudon County |
| Cherokee County, NC | 46 km (28 mi) | S | earthquakes near Cherokee County |
| Swain County, NC | 47 km (29 mi) | E | earthquakes near Swain County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 2.0 2 km SW of Vonore, Tennessee
- 2.4 2 km SW of Vonore, Tennessee
- 1.5 12 km SE of Greenback, Tennessee
- 2.0 3 km ESE of Tellico Village, Tennessee
- 1.8 0 km SE of Farragut, Tennessee
- 2.4 5 km E of Etowah, Tennessee
- 2.3 1 km S of Friendsville, Tennessee
- 1.8 5 km SSE of Friendsville, Tennessee
- 2.4 5 km SSE of Friendsville, Tennessee
- 1.7 4 km NE of Louisville, Tennessee
- 2.0 3 km WSW of Alcoa, Tennessee
- 2.2 3 km WSW of Alcoa, Tennessee
- 2.2 10 km WNW of Lake Santeetlah, North Carolina
- 1.8 11 km S of Tellico Plains, Tennessee
- 2.1 5 km S 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.