QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mb

91 km SSE of Sand Point, Alaska

· 35 km deep · released about 7.6 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 3.8 (mb)
Depth
35 km below the surface
Felt
1 report · strongest reported intensity I
Measured shaking
intensity II (ShakeMap)
Nearest
Aleutians East Borough, 141 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 359 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× 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 54.5381, -160.1758. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 141 km (87 mi) ESE 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

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

  1. 2.4 92 km SSE of Sand Point, Alaska
  2. 1.9 83 km S of Sand Point, Alaska
  3. 2.6 83 km S of Sand Point, Alaska
  4. 2.3 96 km S of Sand Point, Alaska
  5. 2.1 87 km SSE of Sand Point, Alaska
  6. 2.4 80 km S of Sand Point, Alaska
  7. 1.8 87 km S of Sand Point, Alaska
  8. 1.9 85 km SSE of Sand Point, Alaska
  9. 1.6 85 km SSE of Sand Point, Alaska
  10. 1.7 96 km SSE of Sand Point, Alaska
  11. 2.0 92 km SSE of Sand Point, Alaska
  12. 1.8 110 km SSE of Sand Point, Alaska
  13. 1.8 92 km SSE of Sand Point, Alaska
  14. 1.9 86 km SSE of Sand Point, Alaska
  15. 2.0 92 km S 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.

For this area

The largest earthquake within 50 km in our catalogue was M 7.6 on 2020-10-19 — it released about 500,000 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.