QuakeIndex

mining explosion · reviewed by a seismologist

M 2.4ml

4 km ENE of Alpena, Michigan

· 0.0 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Presque Isle County 19 kmAlpena County 21 kmAlcona County 48 kmMontmorency County 59 kmOscoda County 73 kmIosco County 77 kmOtsego County 94 kmCheboygan County 98 kmOgemaw County 102 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.4 (ml)
Depth
0.0 km below the surface
Felt
no reports yet
Nearest
Presque Isle County, 19 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3119 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as mining explosion, not an earthquake.

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.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. 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 45.0828, -83.3808. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Presque Isle County, MI 19 km (12 mi) SSE of here earthquakes near Presque Isle County
Alpena County, MI 21 km (13 mi) N of here earthquakes near Alpena County
Alcona County, MI 48 km (30 mi) N of here earthquakes near Alcona County
Montmorency County, MI 59 km (37 mi) E of here earthquakes near Montmorency County
Oscoda County, MI 73 km (46 mi) NE of here earthquakes near Oscoda County
Iosco County, MI 77 km (48 mi) N of here earthquakes near Iosco County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

  1. 2.4 7 km NE of Alpena, Michigan

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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.