39 km WSW of Unalaska, Alaska

2016-08-26 02:13 UTC · 13 km deep · released about 30 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: 2016-08-26 02:13 UTC
Magnitude: M 2.0 (ml)
Depth: 13 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1152 days ago · we first saw it 1152 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
Magna, Utah 2020 M 5.7 350,000× the energy of this one
Around the size people start to feel M 3.0 32× the energy of this one
This earthquake M 2.0 about 30 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 53.7568, -167.1072. Map © OpenStreetMap contributors.

Aftershocks so far

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

1.7 71 km SW of Unalaska, Alaska 03:34 UTC
2.1 36 km SSW of Unalaska, Alaska 08:20 UTC
3.9 26 km SSW of Unalaska, Alaska 08:05 UTC
1.9 83 km WSW of Unalaska, Alaska 07:58 UTC
2.2 14 km SSW of Unalaska, Alaska 10:56 UTC
1.8 65 km SW of Unalaska, Alaska 13:40 UTC
1.7 76 km SW of Unalaska, Alaska 02:46 UTC
1.6 48 km S of Unalaska, Alaska 22:52 UTC
2.0 55 km SW of Unalaska, Alaska 03:20 UTC
1.8 14 km N of Dutch Harbor, Alaska 20:43 UTC
1.8 23 km W of Dutch Harbor, Alaska 02:12 UTC
2.0 34 km SW of Unalaska, Alaska 09:53 UTC
1.8 50 km SW of Unalaska, Alaska 13:12 UTC
1.7 32 km SW of Unalaska, Alaska 01:29 UTC
1.6 33 km SW of Unalaska, Alaska 01:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:13 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.