143 km SSE of Chignik, Alaska

Yes. A magnitude 2.8 earthquake was recorded 143 km SSE of Chignik, Alaska at 07:22 UTC on 2026-03-13, 1.8 km deep.

2026-03-13 07:22 UTC · 1.8 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: 2026-03-13 07:22 UTC
Magnitude: M 2.8 (ml)
Depth: 1.8 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 171 days ago · we first saw it 171 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 6.9 on 2021-08-14 — about 1,400,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

6.9 105 km ESE of Perryville, Alaska · 41 km NW of this epicentre Nov 17, 1938
6.7 121 km SE of Chignik, Alaska · 28 km N of this epicentre Feb 13, 1979
6.2 143 km SE of Perryville, Alaska · 48 km SW of this epicentre Mar 25, 1927
6.0 168 km SE of Chignik, Alaska · 47 km E of this epicentre Nov 16, 1938
6.0 98 km ESE of Perryville, Alaska · 47 km WNW of this epicentre Jan 2, 1985

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

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

2.4 131 km SE of Chignik, Alaska 16:05 UTC
3.5 148 km SE of Chignik, Alaska 23:23 UTC
2.5 120 km ESE of Perryville, Alaska 23:28 UTC
3.5 184 km SE of Perryville, Alaska 19:49 UTC
3.0 179 km SE of Perryville, Alaska 22:53 UTC
3.9 125 km SE of Perryville, Alaska 22:38 UTC
4.8 184 km SE of Perryville, Alaska 15:16 UTC
2.1 142 km SE of Chignik, Alaska 00:04 UTC
3.4 142 km SE of Perryville, Alaska 13:00 UTC
2.9 186 km SE of Perryville, Alaska 04:23 UTC
3.0 121 km SE of Perryville, Alaska 19:20 UTC
2.4 134 km SE of Chignik, Alaska 16:16 UTC
1.8 99 km SE of Chignik, Alaska 19:52 UTC
2.5 180 km SE of Perryville, Alaska 06:55 UTC
3.1 180 km SE of Perryville, Alaska 17:06 UTC

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