QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3ml

83 km ESE 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 (ml)
Depth
10 km below the surface
Felt
7 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.
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1984 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 7 people have reported feeling it to USGS.

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 59.3894, -138.2800. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.1 102 km WSW of Mosquito Lake, Alaska
  2. 2.0 112 km ESE of Yakutat, Alaska
  3. 1.6 92 km E of Yakutat, Alaska
  4. 1.5 83 km E of Yakutat, Alaska
  5. 2.2 109 km ESE of Yakutat, Alaska
  6. 1.5 101 km ESE of Yakutat, Alaska
  7. 1.7 102 km ESE of Yakutat, Alaska
  8. 2.4 117 km WSW of Covenant Life, Alaska
  9. 1.5 106 km WSW of Mosquito Lake, Alaska
  10. 1.5 99 km ESE of Yakutat, Alaska
  11. 1.6 51 km E of Yakutat, Alaska
  12. 1.5 60 km E of Yakutat, Alaska
  13. 1.6 91 km E of Yakutat, Alaska
  14. 1.5 54 km E of Yakutat, Alaska
  15. 1.5 65 km ESE 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.