203 km W of Port McNeill, Canada

2019-12-25 03:36 UTC · 6.6 km deep · released about 43 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: 2019-12-25 03:36 UTC
Magnitude: M 6.3 (mww)
Depth: 6.6 km below the surface
Felt: 48 reports · strongest reported intensity IV
Measured shaking: intensity IV (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 280 days ago · we first saw it 280 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area. 48 people have reported feeling it to USGS.

How big was it?

This earthquake released about 43 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.3 would have released about 32 times as much.

Ridgecrest, California 2019 M 7.1 16× the energy of this one
Loma Prieta, California 1989 M 6.9 7.9× the energy of this one
Northridge, California 1994 M 6.7 4× the energy of this one
This earthquake M 6.3 about 43 kilotons of TNT
Mineral, Virginia 2011 M 5.8 this one released 5.6× more
Magna, Utah 2020 M 5.7 this one released 7.9× 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.

Where

Map loads when it scrolls into view

Epicentre 50.6106, -129.9630. Map © OpenStreetMap contributors.

Aftershocks so far

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

5.5 204 km WSW of Port McNeill, Canada 04:41 UTC
4.9 195 km WSW of Port McNeill, Canada 02:53 UTC
4.0 207 km W of Port McNeill, Canada 10:58 UTC
4.2 212 km W of Port McNeill, Canada 17:50 UTC
5.2 210 km W of Port McNeill, Canada 05:37 UTC
4.6 211 km W of Port McNeill, Canada 12:05 UTC
5.0 224 km W of Port McNeill, Canada 21:39 UTC
4.4 192 km W of Port McNeill, Canada 16:12 UTC
4.1 201 km W of Port McNeill, Canada 08:40 UTC
4.3 203 km WSW of Port McNeill, Canada 06:41 UTC
5.1 204 km WSW of Port McNeill, Canada 06:06 UTC
4.9 205 km WSW of Port McNeill, Canada 21:46 UTC
4.2 207 km W of Port McNeill, Canada 06:23 UTC
4.3 211 km W of Port McNeill, Canada 01:41 UTC
4.5 219 km W of Port McNeill, Canada 05:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:56 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 6.0 on 2019-12-23.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.