QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

171 km SSE of Akutan, Alaska

· 10 km deep · released about 85 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 2.3 (ml)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2381 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 52.7882, -164.5038. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.1 150 km SSE of Akutan, Alaska
  2. 2.5 133 km SE of Akutan, Alaska
  3. 1.9 139 km SE of Akutan, Alaska
  4. 2.4 138 km SE of Akutan, Alaska
  5. 2.5 128 km SE of Akutan, Alaska
  6. 2.7 172 km SSE of Akutan, Alaska
  7. 2.8 194 km SE of Unalaska, Alaska
  8. 2.9 188 km SSE of Unalaska, Alaska
  9. 2.6 197 km SE of Akutan, Alaska
  10. 1.9 151 km SSE of Akutan, Alaska
  11. 1.9 123 km SSE of Akutan, Alaska
  12. 1.7 137 km SSE of Akutan, Alaska
  13. 2.2 171 km SE of Unalaska, Alaska
  14. 2.9 194 km SSE of Akutan, Alaska
  15. 2.6 169 km SSE of Akutan, 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 4.1 on 2018-12-23 — it released about 500 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.