101 km ESE of Akutan, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

How big was it?

This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 350× the energy of this one
2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
3. Magna, Utah 2020 M 5.7 11× the energy of this one
4. This earthquake M 5.0 about 480 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,000× 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 53.7138, -164.4125. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.8 103 km ESE of Akutan, Alaska 03:34 UTC
2. 2.2 114 km ESE of Akutan, Alaska 01:33 UTC
3. 2.3 97 km E of Akutan, Alaska 11:24 UTC
4. 2.9 99 km SE of Akutan, Alaska 22:43 UTC
5. 2.0 100 km E of Akutan, Alaska 10:34 UTC
6. 2.3 85 km SE of Akutan, Alaska 04:25 UTC
7. 1.6 104 km ESE of Akutan, Alaska 06:11 UTC
8. 2.0 72 km ESE of Akutan, Alaska 08:23 UTC
9. 2.6 71 km ESE of Akutan, Alaska 03:26 UTC
10. 2.0 81 km SE of Akutan, Alaska 23:44 UTC
11. 2.8 89 km SE of Akutan, Alaska 20:50 UTC
12. 2.7 116 km SSW of False Pass, Alaska 12:11 UTC
13. 2.3 Unimak Island region, Alaska 14:11 UTC
14. 3.1 Unimak Island region, Alaska 22:03 UTC
15. 2.1 101 km ESE of Akutan, Alaska 16:07 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:43 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 5.1 on 2017-05-24 — it released about 1.4 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.