QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

175 km ESE of Chiniak, Alaska

· 12 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
12 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1867 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 57.0406, -149.5720. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.7 184 km ESE of Chiniak, Alaska
  2. 2.9 156 km ESE of Chiniak, Alaska
  3. 2.9 163 km ESE of Chiniak, Alaska
  4. 3.1 184 km ESE of Chiniak, Alaska
  5. 2.9 143 km ESE of Chiniak, Alaska
  6. 3.3 203 km ESE of Chiniak, Alaska
  7. 3.1 195 km ESE of Chiniak, Alaska
  8. 2.7 157 km ESE of Chiniak, Alaska
  9. 2.3 202 km ESE of Chiniak, Alaska
  10. 2.6 147 km ESE of Chiniak, Alaska
  11. 2.5 168 km ESE of Chiniak, Alaska
  12. 3.1 213 km ESE of Chiniak, Alaska
  13. 2.8 167 km ESE of Chiniak, Alaska
  14. 2.8 208 km ESE of Chiniak, Alaska
  15. 4.7 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 4.0 on 2020-09-21 — it released about 250 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.