95 km N of Karluk, Alaska

2019-03-01 00:40 UTC · 7.3 km deep · released about 15 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: 2019-03-01 00:40 UTC
Magnitude: M 1.8 (ml)
Depth: 7.3 km below the surface
Felt: no reports yet
Nearest: Kodiak Island Borough, 92 km SSE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1955 days ago · we first saw it 1955 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
Magna, Utah 2020 M 5.7 710,000× the energy of this one
Around the size people start to feel M 3.0 63× the energy of this one
This earthquake M 1.8 about 15 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 58.4125, -154.7414. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Kodiak Island Borough, AK	92 km (57 mi)	NNW of here	earthquakes near Kodiak Island Borough
Lake and Peninsula Borough, AK	103 km (64 mi)	ENE of here	earthquakes near Lake and Peninsula Borough

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

Aftershocks so far

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

1.5 64 km NNW of Karluk, Alaska 20:49 UTC
2.0 81 km NNW of Karluk, Alaska 03:28 UTC
1.5 74 km SSE of Kokhanok, Alaska 22:57 UTC
1.6 101 km NNW of Karluk, Alaska 12:58 UTC
1.6 84 km NNW of Karluk, AK 02:52 UTC
2.1 60 km NNW of Karluk, Alaska 14:45 UTC
1.8 70 km NW of Karluk, Alaska 04:11 UTC
3.4 76 km S of Kokhanok, Alaska 02:38 UTC
1.5 91 km WNW of Aleneva, Alaska 22:29 UTC
1.6 94 km ESE of King Salmon, Alaska 16:26 UTC
1.5 56 km NNW of Karluk, Alaska 15:14 UTC
1.5 84 km N of Karluk, AK 13:25 UTC
1.5 81 km NNW of Karluk, Alaska 16:02 UTC
2.1 58 km NNW of Karluk, Alaska 00:33 UTC
1.9 75 km NNW of Karluk, Alaska 03:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:29 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.