QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

Unimak Island region, Alaska

· 35 km deep · released about 240 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 2.6 (ml)
Depth
35 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1702 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 54.0630, -163.5217. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.5 96 km SSW of False Pass, Alaska
  2. 1.9 93 km S of False Pass, Alaska
  3. 2.2 117 km S of False Pass, Alaska
  4. 1.9 89 km S of False Pass, Alaska
  5. 2.1 113 km SSW of False Pass, Alaska
  6. 2.2 54 km S of False Pass, Alaska
  7. 2.2 106 km SSW of False Pass, Alaska
  8. 2.5 119 km ESE of Akutan, Alaska
  9. 2.0 119 km ESE of Akutan, Alaska
  10. 1.8 70 km S of False Pass, Alaska
  11. 2.0 108 km SSW of False Pass, Alaska
  12. 2.5 123 km ESE of Akutan, Alaska
  13. 3.5 119 km ESE of Akutan, Alaska
  14. 4.3 120 km ESE of Akutan, Alaska
  15. 4.6 117 km ESE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-10-27 — it released about 5,600 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.