11 km SSW of Klukwan, Alaska

2021-11-05 23:40 UTC · 7.7 km deep · released about 85 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: 2021-11-05 23:40 UTC
Magnitude: M 2.3 (ml)
Depth: 7.7 km below the surface
Felt: 2 reports · strongest reported intensity II
Nearest: Haines Borough, 33 km SE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1512 days ago · we first saw it 1512 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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.

Where

Map loads when it scrolls into view

Epicentre 59.3123, -135.9744. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Haines Borough, AK	33 km (20 mi)	NW of here	earthquakes near Haines Borough
Skagway Municipality, AK	45 km (28 mi)	SW of here	earthquakes near Skagway Municipality
Hoonah-Angoon Census Area, AK	101 km (63 mi)	N of here	earthquakes near Hoonah-Angoon Census Area
Juneau City and Borough, AK	147 km (91 mi)	NW of here	earthquakes near Juneau City and Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1.5 52 km SSW of Covenant Life, Alaska 09:35 UTC
1.7 47 km SSW of Covenant Life, Alaska 17:22 UTC
1.5 21 km NNW of Mosquito Lake, Alaska 22:05 UTC
1.8 50 km SSW of Covenant Life, Alaska 13:06 UTC
1.6 31 km SSW of Covenant Life, Alaska 10:10 UTC
1.8 26 km S of Covenant Life, Alaska 03:17 UTC
2.6 40 km SSW of Covenant Life, Alaska 22:01 UTC
1.9 Southeastern Alaska 21:15 UTC
1.5 22 km SSW of Covenant Life, Alaska 17:31 UTC
2.1 5 km ENE of Klukwan, Alaska 18:04 UTC
1.7 Southeastern Alaska 11:57 UTC
1.7 34 km SSW of Covenant Life, Alaska 15:48 UTC
2.2 16 km W of Mud Bay, Alaska 14:20 UTC
1.9 22 km S of Covenant Life, Alaska 22:18 UTC
1.5 18 km SSW of Covenant Life, Alaska 20:54 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:19 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2021-07-08 — it released about 1,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.