QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

150 km S of False Pass, Alaska

· 2.2 km deep · released about 1,900 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 3.2 (ml)
Depth
2.2 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 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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 53.5090, -163.2444. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 164 km S of False Pass, Alaska
  2. 2.5 136 km S of False Pass, Alaska
  3. 2.8 112 km S of False Pass, Alaska
  4. 2.4 143 km SSE of False Pass, Alaska
  5. 2.4 173 km SE of Akutan, Alaska
  6. 2.4 157 km ESE of Akutan, Alaska
  7. 2.7 147 km S of False Pass, Alaska
  8. 2.8 146 km S of False Pass, Alaska
  9. 2.4 112 km S of False Pass, Alaska
  10. 2.5 162 km S of False Pass, Alaska
  11. 4.7 Unimak Island region, Alaska
  12. 3.2 151 km SSE of False Pass, Alaska
  13. 2.6 149 km S of False Pass, Alaska
  14. 2.4 south of Alaska
  15. 3.3 160 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 5.9 on 2016-10-27 — it released about 11,000 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.