47 km SW of Skwentna, Alaska

2016-10-12 05:02 UTC · 117 km deep · released about 60 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: 2016-10-12 05:02 UTC
Magnitude: M 2.2 (ml)
Depth: 117 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1151 days ago · we first saw it 1151 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
Magna, Utah 2020 M 5.7 180,000× the energy of this one
Around the size people start to feel M 3.0 16× the energy of this one
This earthquake M 2.2 about 60 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 61.7497, -152.1458. Map © OpenStreetMap contributors.

Aftershocks so far

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

2.0 71 km WNW of Beluga, Alaska 12:19 UTC
1.5 70 km WNW of Beluga, Alaska 19:17 UTC
1.6 51 km WNW of Beluga, Alaska 05:24 UTC
1.6 33 km W of Skwentna, Alaska 04:25 UTC
1.6 Southern Alaska 17:49 UTC
1.7 42 km SW of Skwentna, Alaska 11:20 UTC
2.1 41 km WNW of Skwentna, Alaska 09:59 UTC
1.6 43 km WNW of Skwentna, Alaska 22:29 UTC
2.6 73 km WNW of Beluga, Alaska 14:57 UTC
1.9 71 km WNW of Beluga, Alaska 14:37 UTC
1.7 42 km WNW of Skwentna, Alaska 22:55 UTC
1.8 23 km W of Skwentna, Alaska 10:45 UTC
1.7 51 km WNW of Skwentna, Alaska 01:24 UTC
1.7 34 km SW of Skwentna, Alaska 20:02 UTC
1.5 34 km WSW of Skwentna, Alaska 02:05 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:11 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.