101 km S 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 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 5,600× the energy of this one
2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
3. Magna, Utah 2020 M 5.7 180× the energy of this one
4. This earthquake M 4.2 about 30 tons of TNT
5. Around the size people start to feel M 3.0 this one released 63× 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 53.9462, -163.5297. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.8 109 km SSW of False Pass, Alaska 10:15 UTC
2. 4.5 117 km SSW of False Pass, Alaska 09:30 UTC
3. 1.8 87 km S of False Pass, Alaska 01:56 UTC
4. 4.5 84 km S of False Pass, Alaska 13:33 UTC
5. 3.0 99 km S of False Pass, Alaska 07:50 UTC
6. 2.3 96 km S of False Pass, Alaska 13:48 UTC
7. 2.1 51 km S of False Pass, Alaska 02:29 UTC
8. 2.1 99 km S of False Pass, Alaska 03:45 UTC
9. 3.2 115 km SSW of False Pass, Alaska 10:04 UTC
10. 2.9 104 km S of False Pass, Alaska 04:08 UTC
11. 2.1 85 km S of False Pass, Alaska 14:45 UTC
12. 2.3 104 km SSE of False Pass, Alaska 00:06 UTC
13. 2.2 123 km S of False Pass, Alaska 04:25 UTC
14. 2.1 82 km S of False Pass, Alaska 10:00 UTC
15. 2.1 121 km S of False Pass, Alaska 06:27 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:09 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 5.9 on 2016-10-27 — it released about 350 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.