154 km S of Adak, Alaska

Yes. A magnitude 2.1 earthquake was recorded 154 km S of Adak, Alaska at 02:21 UTC on 2022-10-05, 13 km deep.

2022-10-05 02:21 UTC · 13 km deep · released about 43 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: 2022-10-05 02:21 UTC
Magnitude: M 2.1 (ml)
Depth: 13 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 1 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 1468 days ago · we first saw it 1468 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 11 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.

Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
Magna, Utah 2020 M 5.7 250,000× the energy of this one
Around the size people start to feel M 3.0 22× the energy of this one
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 4.7 on 2016-11-29 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

6.4 146 km S of Adak, Alaska · 30 km WNW of this epicentre Mar 10, 1957
6.0 136 km S of Adak, Alaska · 42 km WNW of this epicentre Mar 11, 1957
5.8 176 km S of Adak, Alaska · 38 km SW of this epicentre Apr 10, 1957
5.8 164 km S of Adak, Alaska · 25 km WSW of this epicentre Dec 8, 1962
5.7 Andreanof Islands, Aleutian Islands, Alaska · 38 km SSE of this epicentre Feb 5, 1981

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.

2.2 182 km S of Adak, Alaska 09:09 UTC
2.7 118 km SSE of Adak, Alaska 19:29 UTC
2.9 113 km SSE of Adak, Alaska 17:42 UTC
2.9 115 km SSE of Adak, Alaska 00:47 UTC
3.9 110 km SSE of Adak, Alaska 18:47 UTC
2.3 107 km SSE of Adak, Alaska 08:10 UTC
2.4 150 km S of Adak, Alaska 07:14 UTC
2.2 116 km S of Adak, Alaska 22:33 UTC
2.3 157 km SSE of Adak, Alaska 05:00 UTC
2.6 191 km S of Adak, Alaska 11:59 UTC
2.2 169 km SSE of Adak, Alaska 20:42 UTC
2.8 170 km S of Adak, Alaska 13:48 UTC
3.1 177 km S of Adak, Alaska 07:15 UTC
4.6 164 km SSE of Adak, Alaska 03:09 UTC
2.1 156 km S of Adak, Alaska 08:01 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:09 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.