186 km WSW of Adak, Alaska

Yes. A magnitude 5.2 earthquake was recorded 186 km WSW of Adak, Alaska at 03:08 UTC on 2020-06-19, 33 km deep.

2020-06-19 03:08 UTC · 33 km deep · released about 950 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: 2020-06-19 03:08 UTC
Magnitude: M 5.2 (mww)
Depth: 33 km below the surface
Felt: no reports yet
Tsunami: USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status: Reviewed by a seismologist

USGS · last changed by USGS 327 days ago · we first saw it 327 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 216 km (134 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 950 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.2 would have released about 32 times as much.

Northridge, California 1994 M 6.7 180× the energy of this one
Mineral, Virginia 2011 M 5.8 7.9× the energy of this one
Magna, Utah 2020 M 5.7 5.6× the energy of this one
This earthquake M 5.2 about 950 tons of TNT
Around the size people start to feel M 3.0 this one released 2,000× 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.4 on 2019-09-09 — about 2 times the energy of this one.

Before 2016, the USGS record lists 192 earthquakes of M5 or more within 50 km; the five largest:

7.2 162 km WSW of Adak, Alaska · 31 km NNE of this epicentre Mar 16, 1957
7.2 207 km WSW of Adak, Alaska · 37 km NW of this epicentre Dec 19, 2007
7.0 148 km WSW of Adak, Alaska · 38 km ENE of this epicentre Mar 11, 1957
6.9 203 km WSW of Adak, Alaska · 34 km NW of this epicentre Mar 31, 1913
6.9 151 km WSW of Adak, Alaska · 36 km NE of this epicentre May 15, 1993

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Map loads when it scrolls into view

Aftershocks so far

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

4.5 170 km WSW of Adak, Alaska 17:30 UTC
1.8 145 km WSW of Adak, Alaska 21:07 UTC
2.0 176 km WSW of Adak, Alaska 16:06 UTC
1.8 192 km WSW of Adak, Alaska 04:21 UTC
1.7 157 km WSW of Adak, Alaska 06:25 UTC
2.0 182 km WSW of Adak, Alaska 11:31 UTC
2.7 161 km WSW of Adak, Alaska 12:13 UTC
3.8 211 km WSW of Adak, Alaska 09:55 UTC
1.8 202 km WSW of Adak, Alaska 11:02 UTC
1.7 171 km WSW of Adak, Alaska 13:40 UTC
1.5 208 km WSW of Adak, Alaska 04:55 UTC
1.6 201 km WSW of Adak, Alaska 16:55 UTC
1.5 149 km WSW of Adak, Alaska 21:23 UTC
1.7 187 km WSW of Adak, Alaska 07:07 UTC
2.1 145 km WSW of Adak, Alaska 22:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:46 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.