Fox Islands, Aleutian Islands, Alaska

Yes. A magnitude 2.6 earthquake was recorded in the Fox Islands, Aleutian Islands, Alaska at 02:33 UTC on 2016-12-01, 22 km deep.

2016-12-01 02:33 UTC · 22 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: 2016-12-01 02:33 UTC
Magnitude: M 2.6 (ml)
Depth: 22 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1199 days ago · we first saw it 1199 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 9 km (6 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 4.9 on 2016-04-02 — about 2,800 times the energy of this one.

Before 2016, the USGS record lists 127 earthquakes of M5 or more within 50 km; the five largest:

7.1 35 km SW of Nikolski, Alaska · 44 km NNE of this epicentre Mar 11, 1957
6.9 77 km SSW of Nikolski, Alaska · 6 km ESE of this epicentre Jan 23, 1935
6.9 80 km SW of Nikolski, Alaska · 2 km W of this epicentre Mar 9, 1957
6.9 Fox Islands, Aleutian Islands, Alaska · 6 km ENE of this epicentre Jul 27, 2015
6.8 46 km SSW of Nikolski, Alaska · 33 km NE of this epicentre Jul 22, 1933

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

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Aftershocks so far

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

2.2 59 km WSW of Nikolski, Alaska 11:41 UTC
3.5 80 km SSW of Nikolski, Alaska 11:45 UTC
1.6 43 km SW of Nikolski, Alaska 16:43 UTC
2.0 66 km SW of Nikolski, Alaska 11:57 UTC
2.0 68 km SW of Nikolski, Alaska 17:09 UTC
2.3 62 km WSW of Nikolski, Alaska 02:04 UTC
2.4 45 km WSW of Nikolski, Alaska 21:32 UTC
3.6 103 km SW of Nikolski, Alaska 04:54 UTC
2.4 94 km SW of Nikolski, Alaska 19:59 UTC
2.5 90 km SW of Nikolski, Alaska 17:43 UTC
2.2 68 km SW of Nikolski, Alaska 18:31 UTC
3.4 70 km SSW of Nikolski, Alaska 23:18 UTC
2.1 69 km SSW of Nikolski, Alaska 16:34 UTC
2.5 56 km SW of Nikolski, Alaska 00:06 UTC
2.4 90 km SW of Nikolski, Alaska 18:52 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:49 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.