Earthquake · reviewed by a seismologist
M 2.4mb_lg
4 km WSW of Ridgetown, Canada
Yes. A magnitude 2.4 earthquake was recorded 4 km WSW of Ridgetown, Canada, 95 km (59 mi) E of Detroit, MI, at 5:40 pm EST on 21 February 2025 (22:40 UTC), 8.5 km deep.
95 km (59 mi) E of Detroit, MI
- When
- Magnitude
- M 2.4 (mb_lg)
- Depth
- 8.5 km below the surface
- Felt
- no reports yet
- Nearest
- St. Clair County, 82 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 555 days ago
Earthquake alerts for Algonac, MI
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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 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 41 km (25 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.
How big was it?
This earthquake released about 120 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 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 89,000× the energy of this one
- Around the size people start to feel M 3.0 7.9× the energy of this one
- This earthquake M 2.4 about 120 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 42.4213, -81.9420. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| St. Clair County, MI | 82 km (51 mi) | NW | earthquakes near St. Clair County |
| Macomb County, MI | 84 km (52 mi) | WNW | earthquakes near Macomb County |
| Lake County, OH | 94 km (59 mi) | SE | earthquakes near Lake County |
| Cuyahoga County, OH | 100 km (62 mi) | SSE | earthquakes near Cuyahoga County |
| Wayne County, MI | 110 km (68 mi) | W | earthquakes near Wayne County |
| Lorain County, OH | 111 km (69 mi) | S | earthquakes near Lorain 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.