136 km WSW of Adak, Alaska

Yes. A magnitude 2.7 earthquake was recorded 136 km WSW of Adak, Alaska at 00:12 UTC on 2017-08-10, 16 km deep.

2017-08-10 00:12 UTC · 16 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: 2017-08-10 00:12 UTC
Magnitude: M 2.7 (ml)
Depth: 16 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1193 days ago · we first saw it 1193 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, people at rest would likely notice it out to about 19 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 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 185 earthquakes of M5 or more within 50 km; the five largest:

7.2 162 km WSW of Adak, Alaska · 29 km SW of this epicentre Mar 16, 1957
7.0 114 km WSW of Adak, Alaska · 31 km ESE of this epicentre Jul 5, 1929
7.0 148 km WSW of Adak, Alaska · 28 km S of this epicentre Mar 11, 1957
6.9 151 km WSW of Adak, Alaska · 25 km SSW of this epicentre May 15, 1993
6.8 177 km WSW of Adak, Alaska · 45 km SW of this epicentre Oct 7, 1989

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

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

1.6 127 km WSW of Adak, Alaska 01:08 UTC
2.0 118 km WSW of Adak, Alaska 17:09 UTC
2.7 117 km WSW of Adak, Alaska 09:50 UTC
1.6 Andreanof Islands, Aleutian Islands, Alaska 04:46 UTC
1.6 125 km WSW of Adak, Alaska 00:28 UTC
1.5 122 km W of Adak, Alaska 19:56 UTC
2.2 120 km WSW of Adak, Alaska 19:35 UTC
2.3 114 km WSW of Adak, Alaska 19:34 UTC
1.9 124 km WSW of Adak, Alaska 15:39 UTC
2.3 125 km WSW of Adak, Alaska 09:28 UTC
2.2 Andreanof Islands, Aleutian Islands, Alaska 09:26 UTC
2.3 133 km W of Adak, Alaska 04:01 UTC
2.2 134 km W of Adak, Alaska 03:50 UTC
2.7 126 km WSW of Adak, Alaska 23:37 UTC
2.3 126 km WSW of Adak, Alaska 22:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:31 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.