129 km SSW of Adak, Alaska

Yes. A magnitude 2.4 earthquake was recorded 129 km SSW of Adak, Alaska at 08:58 UTC on 2018-09-03, 39 km deep.

2018-09-03 08:58 UTC · 39 km deep · released about 120 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: 2018-09-03 08:58 UTC
Magnitude: M 2.4 (ml)
Depth: 39 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2538 days ago · we first saw it 2538 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
Magna, Utah 2020 M 5.7 89,000× the energy of this one
Around the size people start to feel M 3.0 7.9× the energy of this one
This earthquake M 2.4 about 120 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 5.9 on 2017-05-08 — about 180,000 times the energy of this one.

Before 2016, the USGS record lists 53 earthquakes of M5 or more within 50 km; the five largest:

6.8 90 km SSW of Adak, Alaska · 46 km NE of this epicentre Mar 11, 1957
6.2 101 km SW of Adak, Alaska · 49 km NNW of this epicentre Jun 2, 1940
6.1 126 km SW of Adak, Alaska · 47 km NW of this epicentre Oct 1, 1992
6.0 130 km SSW of Adak, Alaska · 3 km ESE of this epicentre Mar 20, 1927
6.0 161 km SSW of Adak, Alaska · 34 km S of this epicentre Jan 11, 1934

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

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

1.8 112 km SW of Adak, Alaska 19:38 UTC
1.9 125 km SW of Adak, Alaska 20:15 UTC
2.6 136 km SSW of Adak, Alaska 20:59 UTC
2.5 136 km SSW of Adak, Alaska 20:58 UTC
1.6 105 km SW of Adak, Alaska 04:44 UTC
1.9 109 km SW of Adak, Alaska 01:27 UTC
1.9 90 km SW of Adak, Alaska 23:56 UTC
2.1 104 km SW of Adak, Alaska 03:42 UTC
2.0 152 km SW of Adak, Alaska 13:27 UTC
2.7 110 km SW of Adak, Alaska 13:51 UTC
3.7 136 km SW of Adak, Alaska 00:59 UTC
1.8 154 km SSW of Adak, Alaska 04:00 UTC
1.8 86 km SW of Adak, Alaska 14:40 UTC
1.7 109 km SW of Adak, Alaska 19:10 UTC
2.2 111 km SW of Adak, Alaska 02:35 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 06:40 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.