50 km NNW of Gustavus, Alaska

2019-02-04 06:30 UTC · 7.9 km deep · released about 1,300 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: 2019-02-04 06:30 UTC
Magnitude: M 3.1 (ml)
Depth: 7.9 km below the surface
Felt: 4 reports · strongest reported intensity II
Nearest: Hoonah-Angoon Census Area, 47 km SSE
Status: Reviewed by a seismologist

USGS · last changed by USGS 2719 days ago · we first saw it 2719 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

Northridge, California 1994 M 6.7 250,000× the energy of this one
Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
Magna, Utah 2020 M 5.7 7,900× the energy of this one
This earthquake M 3.1 about 1,300 lb of TNT
Around the size people start to feel M 3.0 this one released 1.4× more

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 58.8017, -136.1709. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Hoonah-Angoon Census Area, AK	47 km (29 mi)	NNW of here	earthquakes near Hoonah-Angoon Census Area
Haines Borough, AK	47 km (29 mi)	SW of here	earthquakes near Haines Borough
Skagway Municipality, AK	97 km (60 mi)	SSW of here	earthquakes near Skagway Municipality
Juneau City and Borough, AK	125 km (78 mi)	WNW 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

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

1.6 65 km SSW of Covenant Life, Alaska 21:44 UTC
2.0 38 km WSW of Haines, Alaska 23:06 UTC
1.5 37 km WSW of Haines, Alaska 14:42 UTC
1.7 34 km SW of Covenant Life, Alaska 02:10 UTC
1.5 57 km SSW of Covenant Life, Alaska 00:17 UTC
1.8 Southeastern Alaska 11:07 UTC
2.0 35 km WSW of Mud Bay, Alaska 13:27 UTC
1.7 46.3 km NE of Covenant Life, AK 00:19 UTC
1.7 58 km SSW of Covenant Life, Alaska 10:00 UTC
1.5 35 km WSW of Haines, Alaska 04:08 UTC
1.9 67 km NNW of Elfin Cove, Alaska 00:13 UTC
2.0 30 km SSW of Covenant Life, Alaska 04:54 UTC
2.0 66 km NW of Gustavus, Alaska 03:06 UTC
1.5 39 km SSW of Klukwan, Alaska 17:02 UTC
3.0 61 km SSW of Covenant Life, Alaska 23:01 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:58 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 4.0 on 2017-08-18 — it released about 22 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.