113 km SSW of Atka, Alaska

Yes. A magnitude 2.7 earthquake was recorded 113 km SSW of Atka, Alaska at 00:58 UTC on 2017-10-31, 35 km deep.

2017-10-31 00:58 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: 2017-10-31 00:58 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 1192 days ago · we first saw it 1192 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 4.6 on 2016-04-25 — about 710 times the energy of this one.

Before 2016, the USGS record lists 155 earthquakes of M5 or more within 50 km; the five largest:

8.0 1986 Atka, Alaska Earthquake · 29 km NNE of this epicentre May 7, 1986
7.0 101 km SW of Atka, Alaska · 32 km NNW of this epicentre Aug 30, 2013
6.9 100 km ESE of Adak, Alaska · 34 km NW of this epicentre Oct 13, 1926
6.8 99 km SW of Atka, Alaska · 27 km NNW of this epicentre Mar 19, 1957
6.8 100 km SW of Atka, Alaska · 31 km NNW of this epicentre Jun 13, 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

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

2.0 96 km ESE of Adak, Alaska 19:00 UTC
2.1 119 km SSW of Atka, Alaska 22:04 UTC
2.8 76 km SSW of Atka, Alaska 15:33 UTC
2.1 109 km SSW of Atka, Alaska 06:01 UTC
1.6 92 km SW of Atka, Alaska 14:22 UTC
2.3 119 km SE of Adak, Alaska 12:53 UTC
2.0 118 km SE of Adak, Alaska 10:37 UTC
2.0 97 km SSW of Atka, Alaska 01:09 UTC
2.3 111 km SSW of Atka, Alaska 20:34 UTC
2.5 122 km SSW of Atka, Alaska 19:33 UTC
2.3 125 km SSW of Atka, Alaska 19:32 UTC
1.9 90 km SW of Atka, Alaska 15:22 UTC
4.1 96 km SW of Atka, Alaska 01:18 UTC
2.0 76 km SW of Atka, Alaska 03:23 UTC
1.7 71 km SW of Atka, Alaska 02:09 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:22 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.