QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

Gulf of Alaska

· 10 km deep · released about 950 lb of TNT

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10 km30 km60 km120 km N
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 3.0 (ml)
Depth
10 km below the surface
Felt
no reports yet
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 1171 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 lb of TNT

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 57.3062, -143.1195. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.4 Gulf of Alaska
  2. 2.8 287 km SW of Yakutat, Alaska
  3. 4.2 285 km SW of Yakutat, Alaska
  4. 2.7 Gulf of Alaska
  5. 2.5 292 km SW of Yakutat, Alaska
  6. 3.1 Gulf of Alaska
  7. 2.7 Gulf of Alaska
  8. 2.4 270 km SW of Yakutat, Alaska
  9. 3.4 282 km SW of Yakutat, Alaska
  10. 2.6 284 km SW of Yakutat, Alaska
  11. 2.7 Gulf of Alaska
  12. 2.4 274 km SW of Yakutat, Alaska
  13. 2.3 283 km SW of Yakutat, Alaska
  14. 2.7 277 km SW of Yakutat, Alaska
  15. 2.6 Gulf of 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 4.2 on 2016-02-15 — it released about 63 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.