QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3mb

192 km WSW of Yakutat, Alaska

· 10 km deep · released about 43 tons 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 4.3 (mb)
Depth
10 km below the surface
Felt
no reports yet
Measured shaking
intensity I (ShakeMap)
Nearest mapped fault
Gulf of Alaska shear zone, 15 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1738 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 43 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 89× 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 58.8758, -142.8284. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.8 196 km WSW of Yakutat, Alaska
  2. 2.5 221 km WSW of Yakutat, Alaska
  3. 1.8 187 km WSW of Yakutat, Alaska
  4. 2.5 200 km WSW of Yakutat, Alaska
  5. 2.4 202 km WSW of Yakutat, Alaska
  6. 2.3 209 km WSW of Yakutat, Alaska
  7. 2.5 182 km WSW of Yakutat, Alaska
  8. 2.8 183 km WSW of Yakutat, Alaska
  9. 2.3 193 km WSW of Yakutat, Alaska
  10. 1.9 229 km WSW of Yakutat, Alaska
  11. 3.0 202 km SW of Yakutat, Alaska
  12. 1.7 192 km WSW of Yakutat, Alaska
  13. 2.1 194 km WSW of Yakutat, Alaska
  14. 1.9 198 km WSW of Yakutat, Alaska
  15. 1.8 174 km WSW of Yakutat, 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.

On USGS

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