QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mb

84 km NW of Cold Bay, Alaska

· 183 km deep · released about 21 tons of TNT

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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 4.1 (mb)
Depth
183 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 121 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1154 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 55.6426, -163.7812. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 121 km (75 mi) WNW of here earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 2.2 53 km NW of Cold Bay, Alaska
  2. 2.8 76 km WNW of Cold Bay, Alaska
  3. 2.4 50 km NW of Cold Bay, Alaska
  4. 2.1 44 km WNW of Cold Bay, Alaska
  5. 3.1 105 km NW of Cold Bay, Alaska
  6. 4.0 77 km NNW of False Pass, Alaska
  7. 2.1 53 km N of False Pass, Alaska
  8. 2.9 85 km NW of Cold Bay, Alaska
  9. 3.1 60 km NW of Cold Bay, Alaska
  10. 2.6 91 km NW of False Pass, Alaska
  11. 2.6 100 km NNW of False Pass, Alaska
  12. 4.5 58 km WNW of Cold Bay, Alaska
  13. 3.1 47 km WNW of Cold Bay, Alaska
  14. 2.9 57 km NW of False Pass, Alaska
  15. 1.9 36 km WNW of Cold Bay, 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.