Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Spring City, TN
No earthquake was likely felt in Spring City in the 24 hours to 10:28 am EST (15:28 UTC). The last one was M 1.8, 15 km (9 mi) SE, at 7:25 pm EDT on 2 September 2026, estimated intensity II (weak) in town. Every earthquake near Spring City
This page: a magnitude 1.9 earthquake was recorded 10 km (6 mi) south of Spring City, TN, at 2:27 am EDT on 27 September 2023 (06:27 UTC), 20 km deep. 1 person has reported feeling it to USGS.
USGS: 10 km S of Spring City, Tennessee
69 km (43 mi) NNE of Chattanooga, TN · 47 km (29 mi) N of Cleveland, TN
- When
- 2:27 am EDT on 27 September 2023 ()
- Where
- 10 km (6 mi) south of Spring City, TN · earthquakes near Spring City
- Magnitude
- M 1.9 (md)
- Depth
- 20 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Rhea County, 7 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1141 days ago
Earthquake alerts for Spring City, TN
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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 7 km (4 mi) from the epicentre. In Spring City, 10 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: Decatur, Dayton, Graysville, Pikeville.
How big was it?
This earthquake released about 22 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 5.8 680,000× the energy of this one
- Magna, Utah 2020 M 5.7 480,000× the energy of this one
- Around the size people start to feel M 3.0 43× the energy of this one
- This earthquake M 1.9 about 22 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 5,400 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 35.6023, -84.8737. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Rhea County, TN | 7 km (4 mi) | W | earthquakes near Rhea County |
| Meigs County, TN | 11 km (7 mi) | SSE | earthquakes near Meigs County |
| Bledsoe County, TN | 30 km (19 mi) | W | earthquakes near Bledsoe County |
| McMinn County, TN | 30 km (19 mi) | SE | earthquakes near McMinn County |
| Cumberland County, TN | 40 km (25 mi) | NNW | earthquakes near Cumberland County |
| Roane County, TN | 42 km (26 mi) | NE | earthquakes near Roane County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
49 earthquakes have been recorded within 50 km since this one.
- 1.8 6 km WSW of Etowah, Tennessee
- 2.2 10 km WNW of Philadelphia, Tennessee
- 2.0 6 km ENE of Niota, Tennessee
- 2.2 2 km W of Dayton, Tennessee
- 2.1 4 km NNW of Dayton, Tennessee
- 1.8 3 km E of Philadelphia, Tennessee
- 2.2 13 km S of Midtown, Tennessee
- 1.7 5 km ENE of Niota, Tennessee
- 1.8 6 km SW of Decatur, Tennessee
- 2.1 3 km NE of Niota, Tennessee
- 1.9 5 km SSW of Sweetwater, Tennessee
- 2.3 7 km SSE of Charleston, Tennessee
- 2.4 4 km E of Athens, Tennessee
- 2.2 10 km SSE of Dayton, Tennessee
- 1.8 2 km S of Niota, 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.