QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

122 km ENE of Kodiak, Alaska

· 11 km deep · released about 43 lb 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 2.1 (ml)
Depth
11 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1192 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 58.0988, -150.4150. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.2 109 km ENE of Ouzinkie, Alaska
  2. 2.9 116 km ENE of Chiniak, Alaska
  3. 2.4 103 km ENE of Ouzinkie, Alaska
  4. 2.1 108 km ENE of Ouzinkie, Alaska
  5. 2.8 113 km SE of Port Graham, Alaska
  6. 2.4 114 km SE of Port Graham, Alaska
  7. 2.3 116 km ENE of Kodiak, Alaska
  8. 2.4 112 km ENE of Ouzinkie, Alaska
  9. 2.2 123 km SE of Port Graham, Alaska
  10. 3.0 99 km ENE of Kodiak, Alaska
  11. 3.3 107 km ENE of Ouzinkie, Alaska
  12. 2.0 121 km SE of Port Graham, Alaska
  13. 1.8 106 km ENE of Ouzinkie, Alaska
  14. 1.8 106 km ENE of Ouzinkie, Alaska
  15. 2.0 108 km ENE of Kodiak, 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.