QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

200 km SE of Chiniak, Alaska

· 32 km deep · released about 950 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 3.0 (ml)
Depth
32 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1143 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 56.2429, -150.1436. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 Gulf of Alaska
  2. 3.4 228 km SE of Chiniak, Alaska
  3. 3.5 231 km SE of Chiniak, Alaska
  4. 3.2 221 km SE of Chiniak, Alaska
  5. 3.2 228 km SE of Chiniak, Alaska
  6. 2.9 197 km SE of Chiniak, Alaska
  7. 3.2 226 km SE of Chiniak, Alaska
  8. 3.1 212 km SE of Chiniak, Alaska
  9. 3.2 208 km SE of Chiniak, Alaska
  10. 3.3 214 km SE of Chiniak, Alaska
  11. 3.2 215 km SE of Chiniak, Alaska
  12. 3.1 204 km SE of Chiniak, Alaska
  13. 3.9 212 km SE of Chiniak, Alaska
  14. 3.0 213 km SE of Chiniak, Alaska
  15. 2.8 205 km SE of Chiniak, 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 2018-01-23 — it released about 1,000 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.