59 km SSE of Chiniak, Alaska

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 32,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
4. This earthquake M 3.7 about 5.4 tons of TNT
5. Around the size people start to feel M 3.0 this one released 11× 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 57.1624, -151.7522. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 29 km ESE of Chiniak, Alaska 04:45 UTC
2. 2.1 57 km SE of Chiniak, Alaska 01:03 UTC
3. 2.1 17 km SSE of Chiniak, Alaska 12:21 UTC
4. 2.7 22 km S of Chiniak, Alaska 17:21 UTC
5. 2.5 24 km E of Chiniak, Alaska 22:56 UTC
6. 2.6 37 km SE of Chiniak, Alaska 09:22 UTC
7. 2.8 22 km SSE of Chiniak, Alaska 16:41 UTC
8. 2.7 36 km SSE of Chiniak, Alaska 10:54 UTC
9. 2.5 25 km S of Chiniak, Alaska 18:29 UTC
10. 2.1 18 km SE of Chiniak, Alaska 21:26 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:59 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.