QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

182 km SW of Nikolski, Alaska

· 35 km deep · released about 480 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 2.8 (ml)
Depth
35 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 337 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 51.9406, -170.9855. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.3 157 km SW of Nikolski, Alaska
  2. 3.6 210 km SW of Nikolski, Alaska
  3. 2.9 212 km SW of Nikolski, Alaska
  4. 2.8 189 km WSW of Nikolski, Alaska
  5. 2.9 148 km SW of Nikolski, Alaska
  6. 2.9 141 km SW of Nikolski, Alaska
  7. 2.7 146 km SW of Nikolski, Alaska
  8. 2.8 184 km E of Atka, Alaska
  9. 2.9 182 km SW of Nikolski, Alaska
  10. 2.8 139 km SW of Nikolski, Alaska
  11. 2.6 161 km SW of Nikolski, Alaska
  12. 2.7 170 km SW of Nikolski, Alaska
  13. 3.4 177 km WSW of Nikolski, Alaska
  14. 2.8 188 km E of Atka, Alaska
  15. 2.5 176 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 63,000 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.