Andreanof Islands, Aleutian Islands, Alaska

Yes. A magnitude 2.6 earthquake was recorded in the Andreanof Islands, Aleutian Islands, Alaska at 08:16 UTC on 2023-01-31, 10 km deep.

2023-01-31 08:16 UTC · 10 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area

Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 2023-01-31 08:16 UTC
Magnitude: M 2.6 (ml)
Depth: 10 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1311 days ago · we first saw it 1311 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
Magna, Utah 2020 M 5.7 45,000× the energy of this one
Around the size people start to feel M 3.0 4× the energy of this one
This earthquake M 2.6 about 240 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 6.0 on 2019-12-02 — about 130,000 times the energy of this one.

Before 2016, the USGS record lists 82 earthquakes of M5 or more within 50 km; the five largest:

6.8 111 km SW of Adak, Alaska · 39 km N of this epicentre Jan 4, 1912
6.6 117 km SW of Adak, Alaska · 39 km N of this epicentre Sep 30, 1992
6.5 144 km SW of Adak, Alaska · 25 km NW of this epicentre Apr 16, 1927
6.4 133 km SW of Adak, Alaska · 32 km NNW of this epicentre Mar 12, 1957
6.3 134 km SW of Adak, Alaska · 22 km NNW of this epicentre Aug 3, 1972

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

Map loads when it scrolls into view

Aftershocks so far

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

3.3 142 km WSW of Adak, Alaska 03:48 UTC
3.1 Andreanof Islands, Aleutian Islands, Alaska 12:52 UTC
3.0 168 km SW of Adak, Alaska 16:07 UTC
1.7 121 km WSW of Adak, Alaska 02:25 UTC
1.8 Andreanof Islands, Aleutian Islands, Alaska 19:12 UTC
2.0 141 km WSW of Adak, Alaska 10:09 UTC
3.1 154 km SW of Adak, Alaska 00:16 UTC
3.5 112 km SW of Adak, Alaska 09:57 UTC
3.4 96 km SW of Adak, Alaska 05:08 UTC
2.6 152 km SW of Adak, Alaska 23:21 UTC
2.6 130 km SW of Adak, Alaska 11:01 UTC
2.0 114 km SW of Adak, Alaska 01:40 UTC
3.2 129 km SW of Adak, Alaska 07:38 UTC
2.7 149 km WSW of Adak, Alaska 23:39 UTC
2.1 150 km SW of Adak, Alaska 13:27 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:58 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.