QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

162 km SSE of Akutan, Alaska

· 21 km deep · released about 950 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 3.0 (ml)
Depth
21 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1140 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 52.7888, -164.8348. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 147 km SE of Akutan, Alaska
  2. 3.3 136 km SE of Akutan, Alaska
  3. 3.5 132 km SE of Akutan, Alaska
  4. 4.1 129 km SE of Akutan, Alaska
  5. 2.7 129 km SE of Akutan, Alaska
  6. 3.3 135 km SSE of Akutan, Alaska
  7. 2.8 146 km SE of Akutan, Alaska
  8. 2.3 171 km SSE of Akutan, Alaska
  9. 3.2 210 km SSE of Akutan, Alaska
  10. 2.0 146 km SSE of Akutan, Alaska
  11. 2.2 132 km SE of Akutan, Alaska
  12. 2.4 132 km SE of Akutan, Alaska
  13. 2.9 211 km SSE of Akutan, Alaska
  14. 3.0 135 km SE of Akutan, Alaska
  15. 2.2 145 km SE of Unalaska, 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.