QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

110 km NE of Yakutat, Alaska

· 15 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
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 1.8 (ml)
Depth
15 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 943 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 60.1894, -138.2140. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.0 106 km ENE of Yakutat, Alaska
  2. 2.0 100 km ENE of Yakutat, Alaska
  3. 3.2 83 km NE of Yakutat, Alaska
  4. 1.6 115 km NE of Yakutat, Alaska
  5. 1.5 107 km ENE of Yakutat, Alaska
  6. 2.3 116 km ENE of Yakutat, Alaska
  7. 2.7 114 km ENE of Yakutat, Alaska
  8. 1.5 115 km NE of Yakutat, Alaska
  9. 3.1 123 km NW of Mosquito Lake, Alaska
  10. 2.0 114 km WNW of Mosquito Lake, Alaska
  11. 1.9 98 km ENE of Yakutat, Alaska
  12. 2.2 118 km WNW of Mosquito Lake, Alaska
  13. 2.2 127 km NE of Yakutat, Alaska
  14. 2.7 106 km ENE of Yakutat, Alaska
  15. 1.5 110 km NE 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.