Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Massac, KY
No earthquake was likely felt in Massac in the 24 hours to 2:24 am CST (08:24 UTC). The last one was M 2.5, 9 km (6 mi) WNW, at 11:35 pm CDT on 19 August 2026, estimated intensity III (weak) in town; 66 felt reports to USGS. Every earthquake near Massac
This page: a magnitude 2.5 earthquake was recorded 9 km (6 mi) west-northwest of Massac, KY, at 11:35 pm CDT on 19 August 2026 (04:35 UTC), 14 km deep. 66 people have reported feeling it to USGS.
USGS: 6 km NW of Massac, Kentucky
- When
- 11:35 pm CDT on 19 August 2026 ()
- Where
- 9 km (6 mi) west-northwest of Massac, KY · earthquakes near Massac
- Kentucky today
- every earthquake in Kentucky in the last 24 hours
- Magnitude
- M 2.5 (md)
- Depth
- 14 km below the surface
- Felt
- 66 reports · strongest reported intensity IV
- Nearest
- McCracken County, 6 km E
- Nearest mapped fault
- St. Louis-Cape Girardeau liquefaction features, 25 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 62 days ago
Earthquake alerts for Massac, KY
Get a notification in this browser when USGS records an earthquake near Massac, KY. 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 42 km (26 mi) from the epicentre. In Massac, 9 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.
Earthquakes near other towns within 30 km: Metropolis, Hendron, Paducah, La Center, Farley, Reidland.
How big was it?
This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 99,000× the energy of this one
- Magna, Utah 2020 M 5.7 70,000× the energy of this one
- Around the size people start to feel M 3.0 6.2× the energy of this one
- This earthquake M 2.5 about 150 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 37.0568, -88.7798. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| McCracken County, KY | 6 km (4 mi) | E | earthquakes near McCracken County |
| Massac County, IL | 19 km (12 mi) | NNE | earthquakes near Massac County |
| Ballard County, KY | 20 km (13 mi) | W | earthquakes near Ballard County |
| Carlisle County, KY | 28 km (18 mi) | SW | earthquakes near Carlisle County |
| Pulaski County, IL | 36 km (22 mi) | WNW | earthquakes near Pulaski County |
| Graves County, KY | 39 km (24 mi) | SSE | earthquakes near Graves County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.