Earthquake · reviewed by a seismologist
M 3.0md
Earthquake near Decatur, TN
No earthquake was likely felt in Decatur in the 24 hours to 3:29 am EST (08:29 UTC). The last one was M 1.9, 18 km (11 mi) SE, at 6:30 am EDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Decatur
This page: a magnitude 3.0 earthquake was recorded 11 km (7 mi) north-northeast of Decatur, TN, at 4:27 am EST on 12 December 2018 (09:27 UTC), 5.8 km deep. 761 people have reported feeling it to USGS.
USGS: 10 km NNE of Decatur, Tennessee
76 km (47 mi) NE of Chattanooga, TN · 49 km (30 mi) NNE of Cleveland, TN
- When
- 4:27 am EST on 12 December 2018 ()
- Where
- 11 km (7 mi) north-northeast of Decatur, TN · earthquakes near Decatur
- Magnitude
- M 3.0 (md)
- Depth
- 5.8 km below the surface
- Felt
- 761 reports · strongest reported intensity V
- Nearest
- Meigs County, 12 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1487 days ago
Earthquake alerts for Decatur, 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 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 71 km (44 mi) from the epicentre. In Decatur, 11 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.
Likely felt in: Decatur 11 km, intensity III · Athens 22 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 830 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 410,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 18,000× the energy of this one
- Magna, Utah 2020 M 5.7 13,000× the energy of this one
- This earthquake M 3.0 about 830 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 140 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 35.6025, -84.7360. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Meigs County, TN | 12 km (8 mi) | SW | earthquakes near Meigs County |
| Rhea County, TN | 19 km (12 mi) | W | earthquakes near Rhea County |
| McMinn County, TN | 22 km (14 mi) | SSE | earthquakes near McMinn County |
| Roane County, TN | 33 km (21 mi) | NE | earthquakes near Roane County |
| Loudon County, TN | 41 km (25 mi) | ENE | earthquakes near Loudon County |
| Bledsoe County, TN | 42 km (26 mi) | W | earthquakes near Bledsoe County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.6 8 km N of Madisonville, Tennessee
- 2.3 8 km E of Pikeville, Tennessee
- 1.8 6 km SW of Tellico Plains, Tennessee
- 2.5 6 km ENE of Decatur, Tennessee
- 2.0 3 km WNW of Madisonville, Tennessee
- 2.1 6 km WNW of Vonore, Tennessee
- 2.0 4 km ESE of Huntsville, Tennessee
- 2.1 2 km WNW of Tellico Village, Tennessee
- 1.8 4 km WSW of Graysville, Tennessee
- 2.3 6 km SE of Englewood, Tennessee
- 1.7 10 km SSE of Vonore, Tennessee
- 1.6 8 km SSE of Vonore, Tennessee
- 1.7 6 km WSW of Tellico Village, Tennessee
- 1.7 11 km WNW of Loudon, Tennessee
- 2.1 2 km W of Hopewell, 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.