212 km SE of Adak, Alaska

Yes. A magnitude 2.7 earthquake was recorded 212 km SE of Adak, Alaska at 14:14 UTC on 2024-07-21, 35 km deep.

2024-07-21 14:14 UTC · 35 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: 2024-07-21 14:14 UTC
Magnitude: M 2.7 (ml)
Depth: 35 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 776 days ago · we first saw it 776 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 4.3 on 2022-03-24 — about 250 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

6.9 216 km SSE of Adak, Alaska · 34 km SW of this epicentre Sep 17, 1911
6.6 208 km S of Atka, Alaska · 41 km E of this epicentre Apr 30, 1913
6.3 204 km SSE of Adak, Alaska · 43 km WSW of this epicentre Feb 22, 1958
6.1 193 km SE of Adak, Alaska · 22 km N of this epicentre Aug 19, 1992
5.6 178 km SE of Adak, Alaska · 38 km N of this epicentre Dec 26, 1971

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

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

2.7 192 km SSE of Adak, Alaska 17:53 UTC
2.6 209 km SE of Adak, Alaska 11:02 UTC
2.4 172 km SSE of Adak, Alaska 09:37 UTC
3.1 176 km SE of Adak, Alaska 21:54 UTC
2.6 213 km S of Atka, Alaska 02:59 UTC
2.7 207 km SSE of Adak, Alaska 00:10 UTC
2.6 223 km SSE of Adak, Alaska 05:14 UTC
3.0 204 km SSE of Adak, Alaska 04:07 UTC
2.7 174 km SSE of Adak, Alaska 02:57 UTC
3.2 191 km SSE of Adak, Alaska 22:53 UTC
2.8 179 km SE of Adak, Alaska 04:59 UTC
3.2 190 km SE of Adak, Alaska 07:11 UTC
2.6 236 km S of Atka, Alaska 04:55 UTC
3.4 242 km S of Atka, Alaska 16:36 UTC
2.8 213 km SSE of Adak, Alaska 05:31 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:04 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.