271 km WNW of Port McNeill, Canada

2024-09-15 22:22 UTC · 3.8 km deep · released about 85 kilotons 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: 2024-09-15 22:22 UTC
Magnitude: M 6.5 (mww)
Depth: 3.8 km below the surface
Felt: 97 reports · strongest reported intensity V
Measured shaking: intensity V (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 683 days ago · we first saw it 683 days ago

A magnitude 6.5 earthquake was recorded 271 km WNW of Port McNeill, Canada at 22:22 UTC on 2024-09-15. 97 people have reported feeling it to USGS. This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area.

How big was it?

This earthquake released about 85 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.5 would have released about 32 times as much.

Ridgecrest, California 2019 M 7.1 7.9× the energy of this one
Loma Prieta, California 1989 M 6.9 4× the energy of this one
Northridge, California 1994 M 6.7 2× the energy of this one
This earthquake M 6.5 about 85 kilotons of TNT
Mineral, Virginia 2011 M 5.8 this one released 11× more
Magna, Utah 2020 M 5.7 this one released 16× 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 in our catalogue was M 6.2 on 2019-07-04.

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

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Aftershocks so far

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

3.9 247 km WNW of Port McNeill, Canada 17:30 UTC
4.1 264 km WNW of Port McNeill, Canada 15:00 UTC
4.2 286 km WNW of Port McNeill, Canada 00:25 UTC
4.2 268 km WNW of Port McNeill, Canada 12:02 UTC
4.7 279 km WNW of Port McNeill, Canada 01:43 UTC
4.0 270 km WNW of Port McNeill, Canada 23:26 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:21 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.