155 km ESE of Akutan, Alaska

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
4. This earthquake M 3.1 about 1,300 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.4× 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 53.4442, -163.7173. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.8 128 km ESE of Akutan, Alaska 18:58 UTC
2. 2.9 143 km SE of Akutan, Alaska 23:46 UTC
3. 2.9 142 km SE of Akutan, Alaska 23:42 UTC
4. 2.7 115 km ESE of Akutan, Alaska 22:42 UTC
5. 2.8 136 km SE of Akutan, Alaska 06:08 UTC
6. 2.7 159 km ESE of Akutan, Alaska 07:02 UTC
7. 2.9 148 km ESE of Akutan, Alaska 06:59 UTC
8. 2.8 133 km SE of Akutan, Alaska 19:48 UTC
9. 2.8 134 km SE of Akutan, Alaska 19:14 UTC
10. 2.9 147 km S of False Pass, Alaska 18:44 UTC
11. 2.4 122 km S of False Pass, Alaska 04:34 UTC
12. 2.6 121 km S of False Pass, Alaska 05:02 UTC
13. 2.9 128 km S of False Pass, Alaska 16:01 UTC
14. 3.2 134 km S of False Pass, Alaska 22:35 UTC
15. 2.6 112 km S of False Pass, Alaska 23:47 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:09 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 16,000 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.