QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mb

38 km NE of Sand Point, Alaska

· 90 km deep · released about 15 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 4.0 (mb)
Depth
90 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 125 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2369 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 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 55.6180, -160.1357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 125 km (77 mi) ENE 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

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

  1. 1.7 22 km NNW of Sand Point, Alaska
  2. 1.8 38 km ENE of Sand Point, Alaska
  3. 1.5 39 km NNW of Sand Point, Alaska
  4. 1.9 39 km N of Sand Point, Alaska
  5. 1.8 46 km SE of Nelson Lagoon, Alaska
  6. 1.9 45 km E of Nelson Lagoon, Alaska
  7. 1.8 28 km WNW of Ivanof Bay, Alaska
  8. 2.1 38 km WSW of Ivanof Bay, Alaska
  9. 1.5 10 km W of Ivanof Bay, Alaska
  10. 2.0 51 km WSW of Ivanof Bay, Alaska
  11. 1.9 29 km SW of Ivanof Bay, Alaska
  12. 1.7 19 km W of Ivanof Bay, Alaska
  13. 1.9 46 km WSW of Ivanof Bay, Alaska
  14. 1.6 16 km ESE of Sand Point, Alaska
  15. 2.9 51 km E of Sand Point, 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.