138 km SE of Adak, Alaska

Yes. A magnitude 2.3 earthquake was recorded 138 km SE of Adak, Alaska at 16:59 UTC on 2018-01-07, 2.7 km deep.

2018-01-07 16:59 UTC · 2.7 km deep · released about 85 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: 2018-01-07 16:59 UTC
Magnitude: M 2.3 (ml)
Depth: 2.7 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1191 days ago · we first saw it 1191 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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 4.0 on 2017-01-19 — about 350 times the energy of this one.

Before 2016, the USGS record lists 43 earthquakes of M5 or more within 50 km; the five largest:

7.0 153 km SE of Adak, Alaska · 17 km SSE of this epicentre Jan 17, 1903
6.4 106 km SE of Adak, Alaska · 39 km NNW of this epicentre May 8, 1986
6.4 104 km ESE of Adak, Alaska · 43 km NNW of this epicentre Oct 8, 2010
6.3 100 km ESE of Adak, Alaska · 50 km N of this epicentre Aug 14, 1958
6.1 106 km SE of Adak, Alaska · 33 km WNW of this epicentre Mar 22, 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.

2.6 94 km SE of Adak, Alaska 05:31 UTC
2.5 106 km SSW of Atka, Alaska 20:03 UTC
2.3 106 km SE of Adak, Alaska 22:04 UTC
2.5 116 km SE of Adak, Alaska 13:22 UTC
2.9 120 km SE of Adak, Alaska 19:23 UTC
3.4 123 km SE of Adak, Alaska 02:04 UTC
2.1 133 km SSE of Adak, Alaska 16:51 UTC
2.6 121 km SSW of Atka, Alaska 14:14 UTC
2.4 120 km SSW of Atka, Alaska 06:26 UTC
2.9 117 km SSW of Atka, Alaska 12:53 UTC
3.8 112 km SSW of Atka, Alaska 08:17 UTC
2.6 106 km SE of Adak, Alaska 10:48 UTC
2.7 118 km SSW of Atka, Alaska 13:30 UTC
3.2 115 km SSW of Atka, Alaska 11:44 UTC
2.1 Andreanof Islands, Aleutian Islands, Alaska 16:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:47 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.