147 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 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 11,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
3. Magna, Utah 2020 M 5.7 350× the energy of this one
4. This earthquake M 4.0 about 15 tons of TNT
5. Around the size people start to feel M 3.0 this one released 32× 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 53.5353, -163.5522. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.1 103 km S of False Pass, Alaska 05:14 UTC
2. 2.8 98 km S of False Pass, Alaska 10:02 UTC
3. 1.9 117 km ESE of Akutan, Alaska 11:27 UTC
4. 2.5 98 km S of False Pass, Alaska 17:42 UTC
5. 2.0 107 km SSW of False Pass, Alaska 08:01 UTC
6. 2.1 116 km SSW of False Pass, Alaska 01:31 UTC
7. 2.2 134 km S of False Pass, Alaska 19:00 UTC
8. 1.9 160 km S of False Pass, Alaska 01:10 UTC
9. 1.8 145 km ESE of Akutan, Alaska 15:17 UTC
10. 2.5 103 km S of False Pass, Alaska 04:38 UTC
11. 2.0 158 km S of False Pass, Alaska 18:19 UTC
12. 2.6 167 km S of False Pass, Alaska 01:32 UTC
13. 2.5 101 km S of False Pass, Alaska 09:00 UTC
14. 2.9 108 km S of False Pass, Alaska 08:48 UTC
15. 3.0 157 km S of False Pass, Alaska 00:15 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:24 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 710 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.