QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3mwr

170 km SW of Nikolski, Alaska

· 35 km deep · released about 43 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 4.3 (mwr)
Depth
35 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 745 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 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 43 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 89× 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 52.0423, -170.9011. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 160 km SW of Nikolski, Alaska
  2. 2.9 130 km SW of Nikolski, Alaska
  3. 5.0 174 km SW of Nikolski, Alaska
  4. 2.8 171 km WSW of Nikolski, Alaska
  5. 3.6 136 km WSW of Nikolski, Alaska
  6. 2.9 129 km SW of Nikolski, Alaska
  7. 2.8 170 km SW of Nikolski, Alaska
  8. 3.6 176 km WSW of Nikolski, Alaska
  9. 3.2 168 km SW of Nikolski, Alaska
  10. 3.2 188 km SW of Nikolski, Alaska
  11. 3.4 176 km WSW of Nikolski, Alaska
  12. 3.1 151 km SW of Nikolski, Alaska
  13. 3.6 132 km SW of Nikolski, Alaska
  14. 3.1 196 km SW of Nikolski, Alaska
  15. 3.0 171 km SW of Nikolski, 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 6.0 on 2024-05-19 — it released about 350 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.