QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

18 km N of Chignik Lake, Alaska

· 116 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
116 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2043 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 56.4214, -158.8076. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 33 km W of Chignik Lake, Alaska
  2. 1.9 21 km SSE of Chignik Lake, Alaska
  3. 1.5 20 km SSW of Chignik Lake, Alaska
  4. 1.9 19 km WNW of Chignik Lake, Alaska
  5. 2.3 40 km NW of Chignik Lake, Alaska
  6. 1.7 27 km NNW of Chignik Lake, Alaska
  7. 2.5 17 km WNW of Chignik Lake, Alaska
  8. 2.5 46 km WSW of Port Heiden, Alaska
  9. 2.5 55 km SW of Port Heiden, Alaska
  10. 1.5 32 km N of Chignik Lagoon, Alaska
  11. 1.8 20 km SSE of Port Heiden, Alaska
  12. 1.7 14 km N of Chignik Lagoon, Alaska
  13. 2.0 25 km WSW of Chignik Lake, Alaska
  14. 2.3 9 km NNW of Chignik Lagoon, Alaska
  15. 2.2 16 km W of Chignik Lake, 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.