108 km SSW of False Pass, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 340 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.9 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 500× the energy of this one
2. Mineral, Virginia 2011 M 5.8 22× the energy of this one
3. Magna, Utah 2020 M 5.7 16× the energy of this one
4. This earthquake M 4.9 about 340 tons of TNT
5. Around the size people start to feel M 3.0 this one released 710× 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 53.9618, -164.0795. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.3 113 km ESE of Akutan, Alaska 22:20 UTC
2. 2.8 115 km ESE of Akutan, Alaska 22:13 UTC
3. 2.4 96 km SSW of False Pass, Alaska 04:48 UTC
4. 2.5 102 km S of False Pass, Alaska 11:10 UTC
5. 2.8 93 km S of False Pass, Alaska 18:20 UTC
6. 2.3 110 km ESE of Akutan, Alaska 07:34 UTC
7. 2.0 100 km SSW of False Pass, Alaska 01:51 UTC
8. 2.6 103 km ESE of Akutan, Alaska 06:10 UTC
9. 2.3 Unimak Island region, Alaska 06:14 UTC
10. 2.5 92 km SSW of False Pass, Alaska 09:40 UTC
11. 1.9 108 km SSW of False Pass, Alaska 23:59 UTC
12. 3.3 116 km S of False Pass, Alaska 15:40 UTC
13. 2.5 113 km ESE of Akutan, Alaska 08:23 UTC
14. 1.9 Unimak Island region, Alaska 19:42 UTC
15. 2.1 97 km E of Akutan, Alaska 01:50 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:01 UTC. 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 5.1 on 2021-01-11 — it released about 2 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.