24 km NW of Ivanof Bay, Alaska

2019-02-17 05:12 UTC · 14 km deep · released about 8.7 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: 2019-02-17 05:12 UTC
Magnitude: M 1.6 (ml)
Depth: 14 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2691 days ago · we first saw it 2691 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 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
Around the size people start to feel M 3.0 110× the energy of this one
This earthquake M 1.6 about 8.7 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 56.0637, -159.7542. Map © OpenStreetMap contributors.

Aftershocks so far

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

2.1 15 km SSE of Ivanof Bay, Alaska 14:19 UTC
2.1 31 km WNW of Ivanof Bay, Alaska 11:54 UTC
2.4 11 km WNW of Perryville, Alaska 03:24 UTC
2.2 8 km SE of Ivanof Bay, Alaska 09:44 UTC
2.6 58 km NW of Ivanof Bay, Alaska 11:12 UTC
2.3 19 km N of Ivanof Bay, Alaska 04:03 UTC
1.9 30 km N of Ivanof Bay, Alaska 20:45 UTC
2.3 23 km N of Ivanof Bay, Alaska 03:05 UTC
2.6 16 km S of Ivanof Bay, Alaska 18:12 UTC
1.6 17 km WSW of Ivanof Bay, Alaska 00:38 UTC
2.7 33 km W of Chignik Lake, Alaska 16:30 UTC
2.1 44 km WSW of Ivanof Bay, Alaska 04:09 UTC
2.7 14 km SE of Ivanof Bay, Alaska 21:40 UTC
3.4 14 km SSW of Ivanof Bay, Alaska 23:18 UTC
1.9 6 km SW of Perryville, Alaska 21:42 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:10 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.