QuakeIndex

Earthquake · reviewed by a seismologist

M 4.4mb

216 km SE of Akutan, Alaska

· 10 km deep · released about 60 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 4.4 (mb)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1152 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 60 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
  3. Magna, Utah 2020 M 5.7 89× the energy of this one
  4. This earthquake M 4.4 about 60 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 130× 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 52.5978, -163.7921. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 231 km SE of Akutan, Alaska
  2. 3.0 212 km SE of Akutan, Alaska
  3. 2.8 218 km SE of Akutan, Alaska
  4. 2.4 192 km SE of Akutan, Alaska
  5. 3.8 183 km SE of Akutan, Alaska
  6. 2.5 198 km SE of Akutan, Alaska
  7. 2.4 239 km SE of Akutan, Alaska
  8. 2.9 202 km SE of Akutan, Alaska
  9. 3.0 230 km SE of Akutan, Alaska
  10. 3.0 215 km SE of Akutan, Alaska
  11. 2.8 211 km SE of Akutan, Alaska
  12. 2.3 204 km SE of Akutan, Alaska
  13. 2.8 231 km SE of Akutan, Alaska
  14. 3.4 197 km SE of Akutan, Alaska
  15. 2.5 175 km SE of Akutan, 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.