137 km SW of Adak, Alaska

Yes. A magnitude 4.6 earthquake was recorded 137 km SW of Adak, Alaska at 23:12 UTC on 2026-02-17, 10 km deep.

2026-02-17 23:12 UTC · 10 km deep · released about 120 tons 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: 2026-02-17 23:12 UTC
Magnitude: M 4.6 (mb)
Depth: 10 km below the surface
Felt: no reports yet
Measured shaking: intensity IV (ShakeMap)
Status: Reviewed by a seismologist

USGS · last changed by USGS 128 days ago · we first saw it 128 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 149 km (93 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 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

Northridge, California 1994 M 6.7 1,400× the energy of this one
Mineral, Virginia 2011 M 5.8 63× the energy of this one
Magna, Utah 2020 M 5.7 45× the energy of this one
This earthquake M 4.6 about 120 tons of TNT
Around the size people start to feel M 3.0 this one released 250× more

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 6.3 on 2018-08-23 — about 350 times the energy of this one.

Before 2016, the USGS record lists 90 earthquakes of M5 or more within 50 km; the five largest:

6.8 111 km SW of Adak, Alaska · 35 km N of this epicentre Jan 4, 1912
6.6 117 km SW of Adak, Alaska · 36 km N of this epicentre Sep 30, 1992
6.5 144 km SW of Adak, Alaska · 27 km WNW of this epicentre Apr 16, 1927
6.4 133 km SW of Adak, Alaska · 32 km NW of this epicentre Mar 12, 1957
6.3 134 km SW of Adak, Alaska · 21 km NW 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

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

3.8 163 km SW of Adak, Alaska 17:17 UTC
3.2 152 km SW of Adak, Alaska 05:40 UTC
3.2 101 km WSW of Adak, Alaska 03:51 UTC
2.8 144 km WSW of Adak, Alaska 00:47 UTC
3.1 128 km WSW of Adak, Alaska 19:28 UTC
2.7 139 km WSW of Adak, Alaska 07:20 UTC
2.7 138 km SW of Adak, Alaska 21:01 UTC
2.8 111 km SW of Adak, Alaska 11:57 UTC
2.4 107 km SW of Adak, Alaska 10:49 UTC
2.4 117 km WSW of Adak, Alaska 06:44 UTC
2.5 121 km WSW of Adak, Alaska 04:29 UTC
3.0 124 km WSW of Adak, Alaska 06:34 UTC
2.5 122 km SW of Adak, Alaska 04:12 UTC
2.5 149 km SW of Adak, Alaska 00:28 UTC
2.3 125 km WSW of Adak, Alaska 20:17 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:52 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.