QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

115 km WSW of Akhiok, Alaska

· 5.4 km deep · released about 170 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 2.5 (ml)
Depth
5.4 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 925 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 56.4284, -155.8132. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.2 125 km SSE of Ugashik, Alaska
  2. 2.4 101 km SW of Akhiok, Alaska
  3. 1.9 122 km WSW of Akhiok, Alaska
  4. 1.9 101 km W of Akhiok, Alaska
  5. 2.2 112 km WSW of Akhiok, Alaska
  6. 1.5 85 km WSW of Akhiok, Alaska
  7. 1.7 79 km WSW of Akhiok, Alaska
  8. 2.4 109 km W of Akhiok, Alaska
  9. 2.0 108 km W of Akhiok, Alaska
  10. 2.1 126 km WSW of Akhiok, Alaska
  11. 1.5 110 km W of Akhiok, Alaska
  12. 2.6 128 km E of Chignik, Alaska
  13. 2.2 130 km WSW of Akhiok, Alaska
  14. 1.6 105 km W of Akhiok, Alaska
  15. 1.9 87 km WSW of Akhiok, 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 4.6 on 2023-07-28 — it released about 1,400 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.