Earthquake · reviewed by a seismologist
M 1.8md
6 km SSE of Ridgely, TN
Yes. A magnitude 1.8 earthquake was recorded 6 km SSE of Ridgely, TN, at 10:40 am CDT on 18 June 2021 (15:40 UTC), 7.5 km deep.
- When
- Magnitude
- M 1.8 (md)
- Depth
- 7.5 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 14 km N
- Nearest mapped fault
- Reelfoot scarp and New Madrid seismic zone, under 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1969 days ago
Earthquake alerts for Ridgely, TN
Get a notification in this browser when USGS records an earthquake near Ridgely, 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 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 16 km (10 mi) from the epicentre. 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: Ridgely, Caruthersville, Tiptonville, Dyersburg, Newbern, Obion.
How big was it?
This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
- Magna, Utah 2020 M 5.7 660,000× the energy of this one
- Around the size people start to feel M 3.0 59× the energy of this one
- This earthquake M 1.8 about 16 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.
Where
Epicentre 36.2133, -89.4662. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, TN | 14 km (8 mi) | N | earthquakes near Lake County |
| Dyer County, TN | 19 km (12 mi) | SSE | earthquakes near Dyer County |
| Pemiscot County, MO | 29 km (18 mi) | W | earthquakes near Pemiscot County |
| Obion County, TN | 33 km (20 mi) | ENE | earthquakes near Obion County |
| Fulton County, KY | 45 km (28 mi) | NNE | earthquakes near Fulton County |
| New Madrid County, MO | 46 km (28 mi) | NNW | earthquakes near New Madrid County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.7 2 km NE of Marston, Missouri
- 1.6 2 km NNE of Marston, Missouri
- 1.7 5 km SE of Ridgely, Tennessee
- 2.8 8 km ENE of Steele, Missouri
- 1.8 4 km ESE of Ridgely, Tennessee
- 1.8 3 km S of Holland, Missouri
- 1.8 11 km S of Ridgely, Tennessee
- 2.1 7 km ENE of Steele, Missouri
- 1.8 4 km WNW of Marston, Missouri
- 1.7 4 km N of Ridgely, Tennessee
- 1.6 6 km SSE of Ridgely, Tennessee
- 2.1 3 km E of Marston, Missouri
- 1.9 7 km SW of Tiptonville, Tennessee
- 1.7 4 km SE of Ridgely, Tennessee
- 1.7 5 km ESE of Marston, Missouri
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.