south of Alaska

Yes. A magnitude 2.7 earthquake was recorded south of Alaska at 04:02 UTC on 2019-10-30, 10 km deep.

2019-10-30 04:02 UTC · 10 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: 2019-10-30 04:02 UTC
Magnitude: M 2.7 (ml)
Depth: 10 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 12 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 2491 days ago · we first saw it 2491 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 23 km (14 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 4.4 on 2016-07-19 — about 350 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

5.5 218 km SE of Akutan, Alaska · 20 km SE of this epicentre May 3, 2010
5.1 200 km SE of Akutan, Alaska · 10 km SW of this epicentre Jul 8, 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

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

1.9 199 km SSE of Akutan, Alaska 22:47 UTC
2.7 south of Alaska 04:01 UTC
2.2 219 km SSE of Akutan, Alaska 22:46 UTC
2.6 234 km SE of Akutan, Alaska 17:29 UTC
2.9 230 km SE of Akutan, Alaska 17:12 UTC
2.6 210 km SSE of Akutan, Alaska 00:58 UTC
2.7 222 km SSE of Akutan, Alaska 05:44 UTC
2.7 194 km SE of Akutan, Alaska 12:33 UTC
2.5 183 km SE of Akutan, Alaska 22:38 UTC
2.2 198 km SE of Akutan, Alaska 08:46 UTC
2.1 234 km SSE of Akutan, Alaska 18:07 UTC
3.0 205 km SE of Akutan, Alaska 14:40 UTC
2.7 191 km SSE of Akutan, Alaska 12:13 UTC
2.0 214 km SSE of Akutan, Alaska 03:25 UTC
3.3 232 km SE of Akutan, Alaska 10:08 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:09 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.