Earthquake · reviewed by a seismologist
M 2.3md
Earthquake near Herculaneum, MO
No earthquake was likely felt in Herculaneum in the 24 hours to 4:31 am CST (10:31 UTC). The last one was M 3.5, 213 km (133 mi) E, at 2:05 am CDT on 29 June 2026, estimated intensity II (weak) in town; 392 felt reports to USGS. Every earthquake near Herculaneum
This page: a magnitude 2.3 earthquake was recorded 5 km (3 mi) east of Herculaneum, MO, at 5:37 pm CST on 8 January 2025 (23:37 UTC), 9.2 km deep. 14 people have reported feeling it to USGS.
USGS: 4 km E of Herculaneum, Missouri
41 km (25 mi) S of St. Louis, MO
- When
- 5:37 pm CST on 8 January 2025 ()
- Where
- 5 km (3 mi) east of Herculaneum, MO · earthquakes near Herculaneum
- Missouri today
- every earthquake in Missouri in the last 24 hours
- Magnitude
- M 2.3 (md)
- Depth
- 9.2 km below the surface
- Felt
- 14 reports · strongest reported intensity III
- Nearest
- Monroe County, 13 km E
- Nearest mapped fault
- St. Louis-Cape Girardeau liquefaction features, 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 166 days ago
Earthquake alerts for Herculaneum, MO
Get a notification in this browser when USGS records an earthquake near Herculaneum, MO. 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 37 km (23 mi) from the epicentre. In Herculaneum, 5 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: Valmeyer, Pevely, Crystal City, Festus, Barnhart, Imperial.
How big was it?
This earthquake released about 91 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
- Magna, Utah 2020 M 5.7 120,000× the energy of this one
- Around the size people start to feel M 3.0 10× the energy of this one
- This earthquake M 2.3 about 91 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 lists one earthquake of M5 or more within 50 km:
- 5.1 Southwestern Illinois · 23 km SSE of this epicentre
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 38.2762, -90.3283. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Monroe County, IL | 13 km (8 mi) | E | earthquakes near Monroe County |
| Jefferson County, MO | 19 km (12 mi) | W | earthquakes near Jefferson County |
| St. Louis city, MO | 41 km (25 mi) | N | earthquakes near St. Louis city |
| St. Clair County, IL | 41 km (25 mi) | ENE | earthquakes near St. Clair County |
| St. Louis County, MO | 42 km (26 mi) | NNW | earthquakes near St. Louis County |
| Ste. Genevieve County, MO | 46 km (28 mi) | SSE | earthquakes near Ste. Genevieve County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 2.0 6 km SSW of Valmeyer, Illinois
- 2.4 3 km ESE of Fenton, Missouri
- 1.7 3 km WNW of Olympian Village, Missouri
- 2.3 4 km S of Valmeyer, Illinois
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.