QuakeIndex

Earthquake · reviewed by a seismologist

M 5.3mww

57 km WNW of Akhiok, Alaska

· 50 km deep · released about 1.3 kilotons of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 91 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 5.3 (mww)
Depth
50 km below the surface
Felt
9 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kodiak Island Borough, 91 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 278 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5.6× the energy of this one
  3. Magna, Utah 2020 M 5.7 4× the energy of this one
  4. This earthquake M 5.3 about 1.3 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 2,800× 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 57.1463, -155.0386. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 91 km (57 mi) SW of here earthquakes near Kodiak Island Borough
Lake and Peninsula Borough, AK 135 km (84 mi) SE of here earthquakes near Lake and Peninsula Borough

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

Aftershocks so far

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

  1. 2.4 58 km WNW of Akhiok, Alaska
  2. 1.8 55 km WNW of Akhiok, Alaska
  3. 2.8 35 km SW of Karluk, Alaska
  4. 2.0 84 km W of Akhiok, Alaska
  5. 2.6 85 km W of Akhiok, Alaska
  6. 1.9 57 km WSW of Akhiok, Alaska
  7. 1.8 36 km WSW of Karluk, Alaska
  8. 1.8 65 km SW of Karluk, Alaska
  9. 1.7 54 km SW of Karluk, Alaska
  10. 2.0 57 km WNW of Akhiok, Alaska
  11. 1.6 Alaska Peninsula
  12. 1.9 55 km WNW of Akhiok, Alaska
  13. 1.6 56 km SW of Karluk, Alaska
  14. 1.8 30 km WSW of Karluk, Alaska
  15. 1.9 23 km SSW of Karluk, 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 4.9 on 2019-06-30.

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

On USGS

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