Earthquake · reviewed by a seismologist
M 2.4md
Earthquake near Harrison, TN
USGS: 3 km WNW of Harrison, Tennessee
10 km (6 mi) NE of Chattanooga, TN
- When
- 7:12 am EDT on 18 June 2017 ()
- Where
- 3 km (2 mi) WNW of Harrison, TN · earthquakes near Harrison
- Magnitude
- M 2.4 (md)
- Depth
- 18 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Hamilton County, 5 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3393 days ago
A magnitude 2.4 earthquake was recorded 3 km (2 mi) WNW of Harrison, TN, at 7:12 am EDT on 18 June 2017 (11:12 UTC). 1 person has reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Middle Valley, East Chattanooga, Lakesite, Falling Water, Red Bank, Soddy-Daisy.
How big was it?
This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 120,000× the energy of this one
- Magna, Utah 2020 M 5.7 83,000× the energy of this one
- Around the size people start to feel M 3.0 7.4× the energy of this one
- This earthquake M 2.4 about 130 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 35.1275, -85.1715. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Hamilton County, TN | 5 km (3 mi) | NW | earthquakes near Hamilton County |
| Catoosa County, GA | 25 km (16 mi) | S | earthquakes near Catoosa County |
| Bradley County, TN | 29 km (18 mi) | E | earthquakes near Bradley County |
| Sequatchie County, TN | 35 km (22 mi) | NW | earthquakes near Sequatchie County |
| Marion County, TN | 40 km (25 mi) | W | earthquakes near Marion County |
| Whitfield County, GA | 41 km (25 mi) | SSE | earthquakes near Whitfield 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.
- 2.4 10 km NNW of Kimball, Tennessee
- 2.4 9 km SW of Tunnel Hill, Georgia
- 1.9 11 km SSW of Decatur, Tennessee
- 2.3 4 km N of Ooltewah, Tennessee
- 2.0 5 km S of Tunnel Hill, Georgia
- 2.1 11 km SSW of Benton, Tennessee
- 2.2 11 km SSW of Benton, Tennessee
- 2.2 7 km SE of Dayton, Tennessee
- 2.5 9 km SW of Wildwood Lake, TN
- 1.5 8.3 km NE of Wildwood Lake, TN
- 2.3 4 km NNW of Flat Top Mountain, Tennessee
- 2.2 5 km WSW of Chickamauga, Georgia
- 2.4 7 km N of Benton, Tennessee
- 2.3 2 km WSW of Indian Springs, Georgia
- 2.5 5 km S of Tunnel Hill, Georgia
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.