61 km SW of Covenant Life, Alaska

2021-08-04 12:01 UTC · 13 km deep · released about 5.4 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: 2021-08-04 12:01 UTC
Magnitude: M 1.5 (ml)
Depth: 13 km below the surface
Felt: no reports yet
Nearest: Haines Borough, 74 km E
Status: Reviewed by a seismologist

USGS · last changed by USGS 1870 days ago · we first saw it 1870 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
Around the size people start to feel M 3.0 180× the energy of this one
This earthquake M 1.5 about 5.4 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 59.0749, -136.8781. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Haines Borough, AK	74 km (46 mi)	W of here	earthquakes near Haines Borough
Hoonah-Angoon Census Area, AK	94 km (58 mi)	NW of here	earthquakes near Hoonah-Angoon Census Area
Skagway Municipality, AK	103 km (64 mi)	WSW of here	earthquakes near Skagway Municipality

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

Aftershocks so far

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

1.7 57 km SW of Covenant Life, Alaska 00:12 UTC
1.6 75 km WSW of Mosquito Lake, Alaska 18:15 UTC
1.7 75 km SW of Covenant Life, Alaska 05:48 UTC
1.6 48 km SSW of Covenant Life, Alaska 13:16 UTC
1.6 73 km SW of Covenant Life, Alaska 18:00 UTC
1.7 73 km WSW of Covenant Life, Alaska 06:52 UTC
1.7 44 km SSW of Covenant Life, Alaska 04:54 UTC
1.7 Southeastern Alaska 03:19 UTC
1.8 74 km SW of Covenant Life, Alaska 13:11 UTC
1.7 76 km W of Mosquito Lake, Alaska 15:57 UTC
1.5 74 km WSW of Mosquito Lake, Alaska 22:35 UTC
2.3 88 km WSW of Covenant Life, Alaska 23:30 UTC
1.6 70 km SW of Covenant Life, Alaska 18:51 UTC
1.5 84 km NW of Elfin Cove, Alaska 08:11 UTC
2.8 86 km NW of Elfin Cove, Alaska 17:21 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:59 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 5.0 on 2019-09-01 — it released about 180,000 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.