QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

130 km SW of Akhiok, Alaska

· 66 km deep · released about 170 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 2.5 (ml)
Depth
66 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2031 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 56.0299, -155.4820. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.5 151 km SSW of Akhiok, Alaska
  2. 2.8 163 km SSW of Akhiok, Alaska
  3. 2.5 154 km SSW of Akhiok, Alaska
  4. 3.0 156 km SSW of Akhiok, Alaska
  5. 2.8 156 km SSW of Akhiok, Alaska
  6. 3.0 159 km SSW of Akhiok, Alaska
  7. 1.9 116 km WSW of Akhiok, Alaska
  8. 2.4 103 km SW of Akhiok, Alaska
  9. 3.4 150 km SSW of Akhiok, Alaska
  10. 2.5 151 km SW of Akhiok, Alaska
  11. 2.5 114 km WSW of Akhiok, Alaska
  12. 1.9 167 km SW of Akhiok, Alaska
  13. 2.0 157 km SW of Akhiok, Alaska
  14. 2.3 160 km SSW of Akhiok, Alaska
  15. 2.5 147 km SW of Akhiok, 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 4.4 on 2017-12-04 — it released about 710 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.