QuakeIndex

Earthquake · reviewed by a seismologist

M 4.4mwr

33 km W of Akhiok, Alaska

· 0.9 km deep · released about 60 tons of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 93 km
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 4.4 (mwr)
Depth
0.9 km below the surface
Felt
111 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kodiak Island Borough, 93 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 643 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 111 people have reported feeling it to USGS.

How big was it?

This earthquake released about 60 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
  3. Magna, Utah 2020 M 5.7 89× the energy of this one
  4. This earthquake M 4.4 about 60 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 130× 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 56.9819, -154.7131. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 93 km (58 mi) SSW of here earthquakes near Kodiak Island Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.6 30 km WNW of Akhiok, Alaska
  2. 1.9 38 km WSW of Akhiok, Alaska
  3. 2.5 21 km S of Karluk, Alaska
  4. 2.2 46 km SW of Akhiok, Alaska
  5. 2.1 45 km WSW of Akhiok, Alaska
  6. 2.6 29 km SSE of Karluk, Alaska
  7. 1.5 46 km SW of Karluk, Alaska
  8. 1.5 57 km WNW of Akhiok, Alaska
  9. 2.9 24 km WNW of Akhiok, Alaska
  10. 2.0 12 km W of Akhiok, Alaska
  11. 1.8 17 km W of Akhiok, Alaska
  12. 1.8 15 km WNW of Akhiok, Alaska
  13. 1.9 45 km W of Akhiok, Alaska
  14. 2.0 24 km SSW of Karluk, Alaska
  15. 1.6 62 km W of Akhiok, 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 5.3 on 2021-02-13 — it released about 22 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.