124 km ESE of Nikolski, 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 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 2,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
3. Magna, Utah 2020 M 5.7 63× the energy of this one
4. This earthquake M 4.5 about 85 tons of TNT
5. Around the size people start to feel M 3.0 this one released 180× 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 52.7221, -167.0504. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.9 94 km E of Nikolski, Alaska 12:04 UTC
2. 2.0 115 km S of Unalaska, Alaska 20:29 UTC
3. 1.9 110 km S of Unalaska, Alaska 20:15 UTC
4. 2.7 125 km S of Unalaska, Alaska 14:42 UTC
5. 3.0 129 km S of Unalaska, Alaska 11:44 UTC
6. 2.0 130 km S of Unalaska, Alaska 07:45 UTC
7. 2.0 140 km S of Unalaska, Alaska 07:26 UTC
8. 4.3 121 km S of Unalaska, Alaska 07:04 UTC
9. 3.6 126 km S of Unalaska, Alaska 07:00 UTC
10. 2.2 91 km SSW of Unalaska, Alaska 00:37 UTC
11. 1.8 97 km E of Nikolski, Alaska 19:38 UTC
12. 2.2 94 km E of Nikolski, Alaska 15:43 UTC
13. 2.2 104 km E of Nikolski, Alaska 00:42 UTC
14. 2.0 93 km SSW of Unalaska, Alaska 09:26 UTC
15. 2.0 100 km E of Nikolski, Alaska 14:32 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:47 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 5.6 on 2023-11-28 — it released about 45 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.