6 km ENE of Adak, Alaska

Yes. A magnitude 1.6 earthquake was recorded 6 km ENE of Adak, Alaska at 01:42 UTC on 2022-01-30, 7.9 km deep.

2022-01-30 01:42 UTC · 7.9 km deep · released about 7.6 lb of TNT

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: 2022-01-30 01:42 UTC
Magnitude: M 1.6 (ml)
Depth: 7.9 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1723 days ago · we first saw it 1723 days ago

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 8 km (5 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
Around the size people start to feel M 3.0 130× the energy of this one
This earthquake M 1.6 about 7.6 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 5.2 on 2018-02-16 — about 250,000 times the energy of this one.

Before 2016, the USGS record lists 83 earthquakes of M5 or more within 50 km; the five largest:

7.6 5 km WNW of Adak, Alaska · 10 km W of this epicentre Feb 14, 1905
6.7 52 km ESE of Adak, Alaska · 49 km ESE of this epicentre Nov 4, 1977
6.5 46 km ESE of Adak, Alaska · 42 km ESE of this epicentre Jan 5, 1961
6.4 20 km SSW of Adak, Alaska · 25 km SSW of this epicentre Sep 24, 1933
6.3 52 km ENE of Adak, Alaska · 46 km ENE of this epicentre Nov 2, 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

Map loads when it scrolls into view

Aftershocks so far

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

2.2 30 km ESE of Adak, Alaska 17:38 UTC
1.5 30 km E of Adak, Alaska 17:36 UTC
1.6 40 km SW of Adak, Alaska 00:03 UTC
1.7 18 km W of Adak, Alaska 03:39 UTC
2.1 50 km NE of Adak, Alaska 23:27 UTC
2.1 18 km SSW of Adak, Alaska 03:12 UTC
1.5 Andreanof Islands, Aleutian Islands, Alaska 05:20 UTC
1.6 17 km ENE of Adak, Alaska 13:21 UTC
1.5 45 km SSE of Adak, Alaska 17:03 UTC
1.6 5 km NE of Adak, Alaska 02:49 UTC
4.2 14 km SW of Adak, Alaska 21:40 UTC
1.9 6 km NE of Adak, Alaska 01:26 UTC
1.7 Andreanof Islands, Aleutian Islands, Alaska 04:26 UTC
2.6 34 km SSE of Adak, Alaska 23:25 UTC
1.6 6 km NE of Adak, Alaska 20:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:22 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.