QuakeIndex

Earthquake · reviewed by a seismologist

M 5.4mww

93 km SE of False Pass, Alaska

· 49 km deep · released about 1.9 kilotons 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 5.4 (mww)
Depth
49 km below the surface
Felt
7 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 5 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.9 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4× the energy of this one
  3. Magna, Utah 2020 M 5.7 2.8× the energy of this one
  4. This earthquake M 5.4 about 1.9 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 4,000× 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 54.1633, -162.5848. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 59 km S of King Cove, Alaska
  2. 2.4 104 km SSE of False Pass, Alaska
  3. 3.0 54 km SSW of King Cove, Alaska
  4. 2.5 107 km SSE of False Pass, Alaska
  5. 2.8 106 km SSE of False Pass, Alaska
  6. 2.2 50 km SE of False Pass, Alaska
  7. 2.7 95 km SE of False Pass, Alaska
  8. 3.0 103 km SE of False Pass, Alaska
  9. 3.3 74 km SSE of False Pass, Alaska
  10. 2.8 107 km SE of False Pass, Alaska
  11. 2.7 67 km SSE of King Cove, Alaska
  12. 2.5 103 km SSE of False Pass, Alaska
  13. 2.6 104 km SSE of False Pass, Alaska
  14. 2.2 96 km S of King Cove, Alaska
  15. 2.3 97 km S of King Cove, 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 5.2 on 2026-07-14.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.