QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

245 km S of False Pass, Alaska

· 10 km deep · released about 680 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 2.9 (ml)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 783 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 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 52.6694, -162.9316. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 5.0 244 km SSE of False Pass, Alaska
  2. 3.2 228 km S of False Pass, Alaska
  3. 2.7 209 km SE of Akutan, Alaska
  4. 2.8 199 km S of False Pass, Alaska
  5. 3.0 210 km S of False Pass, Alaska
  6. 3.0 269 km S of False Pass, Alaska
  7. 2.5 221 km S of False Pass, Alaska
  8. 2.7 219 km SE of Akutan, Alaska
  9. 2.9 233 km S of False Pass, Alaska
  10. 2.8 206 km SSE of False Pass, Alaska
  11. 3.2 239 km S of False Pass, Alaska
  12. 2.8 221 km S of False Pass, Alaska
  13. 2.9 201 km S of False Pass, Alaska
  14. 3.8 205 km S of False Pass, Alaska
  15. 4.0 201 km S of False Pass, 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 5.0 on 2016-10-01 — 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.