QuakeIndex

Earthquake · automatic estimate, may change

M 3.0ml

113 km SSE of Akhiok, Alaska

· 23 km deep · released about 950 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 3.0 (ml)
Depth
23 km below the surface
Felt
no reports yet
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 301 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 56.0845, -153.1921. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 104 km SSE of Old Harbor, Alaska
  2. 2.6 121 km SSE of Old Harbor, Alaska
  3. 3.2 103 km SSE of Old Harbor, Alaska
  4. 2.4 104 km SSE of Akhiok, Alaska
  5. 2.7 109 km SSE of Akhiok, Alaska
  6. 3.1 107 km SSE of Akhiok, Alaska
  7. 2.9 91 km SSE of Akhiok, Alaska
  8. 2.8 103 km SSE of Akhiok, Alaska
  9. 4.9 96 km SSE of Akhiok, Alaska
  10. 2.5 130 km SSE of Akhiok, Alaska
  11. 4.0 102 km SSE of Akhiok, Alaska
  12. 4.3 104 km SSE of Akhiok, Alaska
  13. 3.1 109 km SSE of Akhiok, Alaska
  14. 3.4 136 km SSE of Akhiok, Alaska
  15. 2.8 104 km SSE 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 5.2 on 2020-04-17 — it released about 2,000 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.