166 km W of Adak, Alaska

Yes. A magnitude 2.7 earthquake was recorded 166 km W of Adak, Alaska at 02:05 UTC on 2023-07-14, 208 km deep.

2023-07-14 02:05 UTC · 208 km deep · released about 340 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: 2023-07-14 02:05 UTC
Magnitude: M 2.7 (ml)
Depth: 208 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1155 days ago · we first saw it 1155 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 it was probably too small to be felt, even directly above it. 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
Magna, Utah 2020 M 5.7 32,000× the energy of this one
Around the size people start to feel M 3.0 2.8× the energy of this one
This earthquake M 2.7 about 340 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 6.2 on 2017-05-08 — about 180,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

6.6 174 km W of Adak, Alaska · 17 km SSW of this epicentre Apr 16, 2008
6.4 170 km WNW of Adak, Alaska · 49 km N of this epicentre Mar 13, 1992
6.4 187 km W of Adak, Alaska · 28 km SW of this epicentre Apr 15, 2008
6.3 128 km W of Adak, Alaska · 38 km E of this epicentre May 10, 1939
6.2 145 km WSW of Adak, Alaska · 48 km SSE of this epicentre Aug 1, 1927

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

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

3.5 174 km W of Adak, Alaska 11:17 UTC
3.1 145 km W of Adak, Alaska 22:38 UTC
3.9 179 km WNW of Adak, Alaska 16:00 UTC
2.1 Andreanof Islands, Aleutian Islands, Alaska 18:51 UTC
2.1 160 km WSW of Adak, Alaska 08:18 UTC
1.6 139 km W of Adak, Alaska 10:02 UTC
2.1 143 km W of Adak, Alaska 11:52 UTC
3.1 140 km W of Adak, Alaska 07:50 UTC
2.9 197 km W of Adak, Alaska 13:46 UTC
1.9 154 km WSW of Adak, Alaska 15:28 UTC
1.9 186 km W of Adak, Alaska 16:22 UTC
2.1 183 km W of Adak, Alaska 10:15 UTC
1.8 146 km W of Adak, Alaska 12:54 UTC
2.1 175 km W of Adak, Alaska 00:33 UTC
2.1 187 km W of Adak, Alaska 12:26 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:17 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.