256 km SE of Perryville, Alaska

Yes. A magnitude 2.8 earthquake was recorded 256 km SE of Perryville, Alaska at 13:57 UTC on 2024-09-30, 1.3 km deep.

2024-09-30 13:57 UTC · 1.3 km deep · released about 480 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: 2024-09-30 13:57 UTC
Magnitude: M 2.8 (ml)
Depth: 1.3 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 3 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 699 days ago · we first saw it 699 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 27 km (17 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
Magna, Utah 2020 M 5.7 22,000× the energy of this one
Around the size people start to feel M 3.0 2× the energy of this one
This earthquake M 2.8 about 480 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 5.4 on 2022-04-25 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

5.0 213 km SE of Perryville, Alaska · 43 km NW of this epicentre Jan 7, 2007

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

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

3.1 243 km SE of Chignik, Alaska 06:03 UTC
2.8 226 km SE of Chignik, Alaska 03:58 UTC
3.5 213 km SE of Perryville, Alaska 00:36 UTC
3.2 215 km SE of Perryville, Alaska 00:09 UTC
2.4 213 km SE of Perryville, Alaska 19:15 UTC
2.5 225 km SE of Chignik, Alaska 00:47 UTC
2.9 212 km SE of Perryville, Alaska 17:33 UTC
4.5 225 km SSE of Chignik, Alaska 02:28 UTC
2.7 229 km SSE of Chignik, Alaska 10:20 UTC
3.0 210 km SE of Perryville, Alaska 00:15 UTC
2.8 210 km SE of Perryville, Alaska 01:00 UTC
2.7 212 km SE of Perryville, Alaska 00:35 UTC
2.6 217 km SE of Perryville, Alaska 11:24 UTC
3.3 224 km SE of Perryville, Alaska 09:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:02 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.