138 km SSE of False Pass, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 670 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11× the energy of this one
3. Magna, Utah 2020 M 5.7 7.9× the energy of this one
4. This earthquake M 5.1 about 670 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,400× 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 53.6466, -162.9300. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.9 131 km SSE of False Pass, Alaska 16:54 UTC
2. 4.1 111 km S of False Pass, Alaska 14:42 UTC
3. 2.2 93 km SSE of False Pass, Alaska 19:06 UTC
4. 2.9 107 km SSE of False Pass, Alaska 10:45 UTC
5. 2.8 Unimak Island region, Alaska 07:21 UTC
6. 2.2 108 km S of False Pass, Alaska 21:20 UTC
7. 2.5 101 km S of False Pass, Alaska 19:31 UTC
8. 2.0 107 km SSE of False Pass, Alaska 09:54 UTC
9. 2.6 102 km S of False Pass, Alaska 09:10 UTC
10. 2.2 96 km S of False Pass, Alaska 06:37 UTC
11. 2.5 156 km S of False Pass, Alaska 09:25 UTC
12. 2.4 118 km SSE of False Pass, Alaska 07:57 UTC
13. 2.8 139 km S of False Pass, Alaska 19:49 UTC
14. 2.3 111 km S of False Pass, Alaska 11:47 UTC
15. 3.9 106 km S of False Pass, Alaska 22:57 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:32 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 16 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.