QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mb

117 km S of Sand Point, Alaska

· 40 km deep · released about 85 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 4.5 (mb)
Depth
40 km below the surface
Felt
no reports yet
Measured shaking
intensity I (ShakeMap)
Nearest
Aleutians East Borough, 131 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1095 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 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 54.2979, -160.7892. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 131 km (81 mi) SE 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

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

  1. 2.1 Alaska Peninsula
  2. 2.9 105 km SSW of Sand Point, Alaska
  3. 2.2 Alaska Peninsula
  4. 2.9 107 km S of Sand Point, Alaska
  5. 3.0 92 km SSW of Sand Point, Alaska
  6. 2.2 86 km SSW of Sand Point, Alaska
  7. 3.8 Alaska Peninsula
  8. 2.3 105 km S of Sand Point, Alaska
  9. 2.2 75 km S of Sand Point, Alaska
  10. 3.9 121 km S of Sand Point, Alaska
  11. 3.2 83 km SSW of Sand Point, Alaska
  12. 2.8 88 km S of Sand Point, Alaska
  13. 2.4 115 km S of Sand Point, Alaska
  14. 2.9 129 km S of Sand Point, Alaska
  15. 2.3 Alaska Peninsula

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 7.2 on 2023-07-16 — it released about 11,000 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.