QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

150 km S of False Pass, Alaska

· 33 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
33 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1151 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 53.5142, -163.1663. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.1 107 km S of False Pass, Alaska
  2. 2.4 105 km S of False Pass, Alaska
  3. 4.0 104 km S of False Pass, Alaska
  4. 2.3 159 km S of False Pass, Alaska
  5. 3.6 161 km S of False Pass, Alaska
  6. 2.4 126 km S of False Pass, Alaska
  7. 3.8 130 km SSE of False Pass, Alaska
  8. 2.8 157 km S of False Pass, Alaska
  9. 2.3 154 km S of False Pass, Alaska
  10. 2.2 142 km S of False Pass, Alaska
  11. 2.6 158 km S of False Pass, Alaska
  12. 2.4 185 km SE of Akutan, Alaska
  13. 2.6 147 km S of False Pass, Alaska
  14. 2.4 108 km S of False Pass, Alaska
  15. 2.8 140 km SSE 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 5.9 on 2016-10-27 — it released about 22,000 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.