83 km SSW of Unalaska, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 350× the energy of this one
2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
3. Magna, Utah 2020 M 5.7 11× the energy of this one
4. This earthquake M 5.0 about 480 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,000× 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 53.1891, -167.0647. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.3 108 km E of Nikolski, Alaska 14:46 UTC
2. 3.2 87 km S of Unalaska, Alaska 20:57 UTC
3. 2.1 76 km SW of Unalaska, Alaska 03:09 UTC
4. 2.3 99 km SSW of Unalaska, Alaska 08:49 UTC
5. 2.1 98 km SSW of Unalaska, Alaska 07:28 UTC
6. 1.8 57 km SSW of Unalaska, Alaska 00:32 UTC
7. 2.2 38 km SSW of Unalaska, Alaska 02:05 UTC
8. 2.4 106 km E of Nikolski, Alaska 17:50 UTC
9. 2.5 99 km SSW of Unalaska, Alaska 02:03 UTC
10. 1.7 77 km WSW of Unalaska, Alaska 07:35 UTC
11. 2.4 96 km SSW of Unalaska, Alaska 18:36 UTC
12. 2.3 96 km SSW of Unalaska, Alaska 18:27 UTC
13. 2.3 98 km SSW of Unalaska, Alaska 14:32 UTC
14. 2.5 98 km SSW of Unalaska, Alaska 13:43 UTC
15. 1.9 103 km E of Nikolski, Alaska 12:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:59 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 6.2 on 2022-01-22 — it released about 63 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.