QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

100 km ENE of Kodiak, Alaska

· 16 km deep · released about 120 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 2.4 (ml)
Depth
16 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1541 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 58.1542, -150.8477. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 98 km ENE of Ouzinkie, Alaska
  2. 1.9 101 km ENE of Ouzinkie, Alaska
  3. 1.7 87 km ENE of Ouzinkie, Alaska
  4. 2.1 94 km ENE of Ouzinkie, Alaska
  5. 2.1 122 km ENE of Kodiak, Alaska
  6. 1.8 121 km SSE of Port Graham, Alaska
  7. 1.9 103 km ENE of Ouzinkie, Alaska
  8. 2.2 75 km ENE of Ouzinkie, Alaska
  9. 2.3 Gulf of Alaska
  10. 2.3 122 km SE of Port Graham, Alaska
  11. 2.4 90 km ENE of Ouzinkie, Alaska
  12. 1.6 115 km ENE of Ouzinkie, Alaska
  13. 1.8 120 km ENE of Ouzinkie, Alaska
  14. 2.0 107 km ENE of Kodiak, Alaska
  15. 1.8 81 km ENE of Ouzinkie, 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 5.0 on 2019-06-07 — it released about 7,900 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.