QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

43 km NNE of Sand Point, Alaska

· 4.9 km deep · released about 43 lb 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 2.1 (ml)
Depth
4.9 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 127 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1920 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 lb of TNT

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 55.6724, -160.1318. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 127 km (79 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

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

  1. 2.0 16 km W of Ivanof Bay, Alaska
  2. 1.6 47 km SSW of Ivanof Bay, Alaska
  3. 1.5 39 km SW of Ivanof Bay, Alaska
  4. 1.5 42 km ESE of Nelson Lagoon, Alaska
  5. 2.2 30 km WNW of Ivanof Bay, Alaska
  6. 3.1 31 km ENE of Sand Point, Alaska
  7. 2.2 14 km WNW of Ivanof Bay, Alaska
  8. 1.9 15 km E of Sand Point, Alaska
  9. 2.2 49 km E of Nelson Lagoon, Alaska
  10. 2.0 1 km ESE of Sand Point, Alaska
  11. 2.3 11 km SW of Ivanof Bay, Alaska
  12. 2.1 7 km NNW of Sand Point, Alaska
  13. 1.7 28 km NNE of Sand Point, Alaska
  14. 2.0 51 km E of Nelson Lagoon, Alaska
  15. 2.0 28 km ENE 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.