QuakeIndex

ice quake · reviewed by a seismologist

M 3.2ml

69 km ENE of Wrangell, Alaska

· 1.0 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wrangell City and Borough 74 kmPetersburg Borough 109 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 3.2 (ml)
Depth
1.0 km below the surface
Felt
no reports yet
Nearest
Wrangell City and Borough, 74 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1464 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

USGS catalogues this as ice quake, not an earthquake.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× more

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 56.7329, -131.3574. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wrangell City and Borough, AK 74 km (46 mi) NNE of here earthquakes near Wrangell City and Borough
Petersburg Borough, AK 109 km (68 mi) ESE of here earthquakes near Petersburg Borough
Prince of Wales-Hyder Census Area, AK 162 km (100 mi) NE of here earthquakes near Prince of Wales-Hyder Census Area

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

Aftershocks so far

3 earthquakes have been recorded within 50 km since this one.

  1. 1.9 70 km ENE of Wrangell, Alaska
  2. 1.7 65 km NE of Wrangell, Alaska
  3. 2.9 Southeastern Alaska

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.