175 km S of Adak, Alaska

Yes. A magnitude 3.8 earthquake was recorded 175 km S of Adak, Alaska at 05:13 UTC on 2024-06-01, 10 km deep.

2024-06-01 05:13 UTC · 10 km deep · released about 7.6 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: 2024-06-01 05:13 UTC
Magnitude: M 3.8 (mb)
Depth: 10 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 20 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 829 days ago · we first saw it 829 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 82 km (51 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 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

Northridge, California 1994 M 6.7 22,000× the energy of this one
Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
Magna, Utah 2020 M 5.7 710× the energy of this one
This earthquake M 3.8 about 7.6 tons of TNT
Around the size people start to feel M 3.0 this one released 16× 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 4.7 on 2016-11-29 — about 22 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

6.4 146 km S of Adak, Alaska · 38 km NW of this epicentre Mar 10, 1957
6.2 204 km S of Adak, Alaska · 34 km SW of this epicentre Dec 9, 1918
6.1 198 km S of Adak, Alaska · 36 km SW of this epicentre May 22, 1957
6.1 189 km S of Adak, Alaska · 39 km WSW of this epicentre Jul 3, 1960
5.8 176 km S of Adak, Alaska · 25 km W of this epicentre Apr 10, 1957

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.

2.5 131 km S of Adak, Alaska 21:07 UTC
4.2 167 km S of Adak, Alaska 12:30 UTC
2.6 168 km S of Adak, Alaska 04:26 UTC
3.2 176 km S of Adak, Alaska 16:45 UTC
2.2 156 km S of Adak, Alaska 00:31 UTC
2.5 173 km SSE of Adak, Alaska 01:41 UTC
2.8 153 km S of Adak, Alaska 20:22 UTC
2.7 156 km S of Adak, Alaska 02:26 UTC
2.5 145 km S of Adak, Alaska 07:18 UTC
2.8 149 km S of Adak, Alaska 23:41 UTC
2.8 136 km SSE of Adak, Alaska 23:12 UTC
2.9 169 km S of Adak, Alaska 10:29 UTC
2.7 143 km S of Adak, Alaska 03:25 UTC
2.9 191 km S of Adak, Alaska 19:37 UTC
2.5 188 km SSE of Adak, Alaska 14:09 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:39 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.