QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

190 km SE of Chiniak, Alaska

· 21 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
21 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 56.2594, -150.3594. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.4 194 km SE of Chiniak, Alaska
  2. 3.0 206 km SE of Chiniak, Alaska
  3. 3.0 180 km SE of Chiniak, Alaska
  4. 3.6 172 km SE of Chiniak, Alaska
  5. 3.2 225 km SE of Chiniak, Alaska
  6. 3.1 219 km SE of Chiniak, Alaska
  7. 3.5 212 km SE of Chiniak, Alaska
  8. 2.7 221 km SE of Chiniak, Alaska
  9. 4.4 235 km SE of Chiniak, Alaska
  10. 3.2 234 km SSE of Chiniak, Alaska
  11. 2.9 210 km SE of Chiniak, Alaska
  12. 3.0 182 km SE of Chiniak, Alaska
  13. 3.1 229 km SE of Chiniak, Alaska
  14. 2.9 190 km SE of Chiniak, Alaska
  15. 3.1 207 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 4.6 on 2018-01-23 — 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.