QuakeIndex

Earthquake · reviewed by a seismologist

M 4.4ml

149 km SSE of Chignik, Alaska

· 37 km deep · released about 60 tons 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 4.4 (ml)
Depth
37 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1145 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 60 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
  3. Magna, Utah 2020 M 5.7 89× the energy of this one
  4. This earthquake M 4.4 about 60 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 130× more

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 55.1699, -157.1119. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.5 106 km SSE of Chignik, Alaska
  2. 4.2 159 km SE of Chignik, Alaska
  3. 5.9 127 km SE of Chignik, Alaska
  4. 2.8 135 km SE of Chignik, Alaska
  5. 3.3 141 km SE of Perryville, Alaska
  6. 2.9 141 km SE of Perryville, Alaska
  7. 3.2 194 km SE of Perryville, Alaska
  8. 2.4 147 km SE of Perryville, Alaska
  9. 2.8 Alaska Peninsula
  10. 3.9 138 km SE of Perryville, Alaska
  11. 2.1 154 km SE of Perryville, Alaska
  12. 3.3 164 km SE of Perryville, Alaska
  13. 4.1 160 km SE of Perryville, Alaska
  14. 2.6 159 km SE of Perryville, Alaska
  15. 2.7 161 km SE of Perryville, 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 4.2 on 2016-09-21.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.