42 km E of Port Heiden, Alaska

Yes. A magnitude 6.2 earthquake was recorded 42 km E of Port Heiden, Alaska at 05:50 UTC on 2016-04-02, 11 km deep. 7 people have reported feeling it to USGS.

2016-04-02 05:50 UTC · 11 km deep · released about 30 kilotons of TNT

Felt it? Tell USGS Check my area

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: 2016-04-02 05:50 UTC
Magnitude: M 6.2 (mw)
Depth: 11 km below the surface
Felt: 7 reports · strongest reported intensity VI
Measured shaking: intensity VII (ShakeMap)
USGS impact alert: green
Tsunami: USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status: Reviewed by a seismologist

USGS · last changed by USGS 1201 days ago · we first saw it 1201 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area.

At this magnitude and depth, people at rest would likely notice it out to about 386 km (240 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 30 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.2 would have released about 32 times as much.

Ridgecrest, California 2019 M 7.1 22× the energy of this one
Loma Prieta, California 1989 M 6.9 11× the energy of this one
Northridge, California 1994 M 6.7 5.6× the energy of this one
This earthquake M 6.2 about 30 kilotons of TNT
Mineral, Virginia 2011 M 5.8 this one released 4× more
Magna, Utah 2020 M 5.7 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.

For this area

The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

5.1 68 km S of Ugashik, Alaska · 42 km ESE of this epicentre Jun 5, 1984

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

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

2.7 52 km E of Port Heiden, Alaska 11:12 UTC
2.5 50 km ENE of Port Heiden, Alaska 10:45 UTC
2.6 55 km E of Port Heiden, Alaska 10:34 UTC
2.8 50 km E of Port Heiden, Alaska 10:29 UTC
3.3 46 km ENE of Port Heiden, Alaska 10:25 UTC
2.9 47 km SSW of Ugashik, Alaska 10:18 UTC
2.6 49 km SSW of Ugashik, Alaska 10:10 UTC
3.0 47 km ENE of Port Heiden, Alaska 10:02 UTC
3.4 48 km ENE of Port Heiden, Alaska 10:01 UTC
3.3 48 km SSW of Ugashik, Alaska 09:45 UTC
2.6 52 km SSW of Ugashik, Alaska 09:29 UTC
2.5 47 km E of Port Heiden, Alaska 09:23 UTC
2.9 52 km SSW of Ugashik, Alaska 09:21 UTC
4.1 46 km SSW of Ugashik, Alaska 09:06 UTC
3.0 48 km SSW of Ugashik, Alaska 08:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:29 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.