86 km NW of Arctic Village, Alaska

2018-10-30 13:14 UTC · 14 km deep · released about 2.7 tons 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: 2018-10-30 13:14 UTC
Magnitude: M 3.5 (ml)
Depth: 14 km below the surface
Felt: no reports yet
Measured shaking: intensity V (ShakeMap)
Status: Reviewed by a seismologist

USGS · last changed by USGS 1138 days ago · we first saw it 1138 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

Northridge, California 1994 M 6.7 63,000× the energy of this one
Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
Magna, Utah 2020 M 5.7 2,000× the energy of this one
This earthquake M 3.5 about 2.7 tons of TNT
Around the size people start to feel M 3.0 this one released 5.6× 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 68.5718, -147.2538. Map © OpenStreetMap contributors.

Aftershocks so far

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

1.5 78 km WNW of Arctic Village, Alaska 18:53 UTC
2.4 119 km NW of Arctic Village, Alaska 13:37 UTC
1.8 76 km WNW of Arctic Village, Alaska 18:22 UTC
1.6 87 km NW of Arctic Village, Alaska 22:29 UTC
1.5 117 km NW of Arctic Village, Alaska 08:22 UTC
3.0 119 km NW of Arctic Village, Alaska 07:11 UTC
1.7 119 km NW of Arctic Village, Alaska 01:07 UTC
1.6 117 km NW of Arctic Village, Alaska 23:48 UTC
2.3 117 km NW of Arctic Village, Alaska 23:41 UTC
1.8 118 km NW of Arctic Village, Alaska 23:39 UTC
2.0 116 km NW of Arctic Village, Alaska 20:35 UTC
1.5 117 km NW of Arctic Village, Alaska 15:34 UTC
1.5 115 km NW of Arctic Village, Alaska 15:32 UTC
1.6 117 km NW of Arctic Village, Alaska 15:05 UTC
1.8 97 km NW of Arctic Village, Alaska 04:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:28 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.