QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mb

55 km SW of Nelson Lagoon, Alaska

· 165 km deep · released about 85 tons of TNT

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10 km30 km60 km120 km N Aleutians East Borough 47 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 4.5 (mb)
Depth
165 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Aleutians East Borough, 47 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2262 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
  3. Magna, Utah 2020 M 5.7 63× the energy of this one
  4. This earthquake M 4.5 about 85 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 180× 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 55.6562, -161.8460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 47 km (29 mi) NNE 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

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

  1. 2.9 27 km SW of Nelson Lagoon, Alaska
  2. 2.9 63 km WSW of Nelson Lagoon, Alaska
  3. 2.2 37 km SW of Nelson Lagoon, Alaska
  4. 1.8 35 km SW of Nelson Lagoon, Alaska
  5. 1.5 56 km NNE of King Cove, Alaska
  6. 2.4 55 km NE of King Cove, Alaska
  7. 2.8 31 km N of King Cove, Alaska
  8. 2.8 35 km SW of Nelson Lagoon, Alaska
  9. 2.4 35 km NE of King Cove, Alaska
  10. 1.7 39 km NE of King Cove, Alaska
  11. 1.7 53 km SW of Nelson Lagoon, Alaska
  12. 2.0 57 km NNE of King Cove, Alaska
  13. 2.2 14 km W of Nelson Lagoon, Alaska
  14. 2.7 60 km NNE of King Cove, Alaska
  15. 1.6 51 km SW of Nelson Lagoon, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2016-09-06 — it released about 2 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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