227 km SE of Akutan, Alaska

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
3. Around the size people start to feel M 3.0 22× the energy of this one
4. This earthquake M 2.1 about 43 lb of TNT

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.

For this area

The largest earthquake within 50 km since 2016 was M 5.3 on 2024-10-16 — about 63,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

1. 5.9 228 km S of False Pass, Alaska · 47 km NE of this epicentre Oct 13, 1972
2. 5.5 218 km SE of Akutan, Alaska · 8 km NNW of this epicentre May 3, 2010
3. 5.1 200 km SE of Akutan, Alaska · 31 km WNW of this epicentre Jul 8, 1989

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 52.5504, -163.6261. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.1 187 km SE of Akutan, Alaska 20:16 UTC
2. 3.2 228 km S of False Pass, Alaska 05:17 UTC
3. 2.6 204 km SE of Akutan, Alaska 08:08 UTC
4. 2.7 209 km SE of Akutan, Alaska 16:56 UTC
5. 2.8 194 km SE of Akutan, Alaska 14:58 UTC
6. 3.0 187 km SE of Akutan, Alaska 17:02 UTC
7. 2.3 200 km SE of Akutan, Alaska 20:04 UTC
8. 2.9 213 km SE of Akutan, Alaska 03:20 UTC
9. 2.9 198 km SE of Akutan, Alaska 13:21 UTC
10. 2.7 190 km SE of Akutan, Alaska 20:03 UTC
11. 2.7 219 km SE of Akutan, Alaska 16:14 UTC
12. 2.6 215 km SE of Akutan, Alaska 08:36 UTC
13. 2.8 221 km S of False Pass, Alaska 11:03 UTC
14. 2.9 194 km SE of Akutan, Alaska 03:33 UTC
15. 2.7 224 km SSE of Akutan, Alaska 22:00 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:30 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.