78 km N of Noonan, Canada

2018-04-22 03:18 UTC · 9.3 km deep · released about 21 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: 2018-04-22 03:18 UTC
Magnitude: M 1.9 (ml)
Depth: 9.3 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 3000 days ago · we first saw it 3000 days ago

A magnitude 1.9 earthquake was recorded 78 km N of Noonan, Canada at 03:18 UTC on 2018-04-22. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
Magna, Utah 2020 M 5.7 500,000× the energy of this one
Around the size people start to feel M 3.0 45× the energy of this one
This earthquake M 1.9 about 21 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 46.6715, -66.5516. Map © OpenStreetMap contributors.

Aftershocks so far

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

2.2 65 km NNE of Noonan, Canada 21:51 UTC
2.3 82 km W of Miramichi, Canada 21:31 UTC
1.9 69 km ENE of Florenceville-Bristol, Canada 21:10 UTC
2.8 54 km NNE of Noonan, Canada 03:20 UTC
2.3 54 km NE of Noonan, Canada 03:12 UTC
2.1 76 km W of Miramichi, Canada 06:11 UTC
2.3 84 km W of Miramichi, Canada 00:34 UTC
1.8 60 km ENE of Florenceville-Bristol, Canada 00:44 UTC
2.4 83 km W of Miramichi, Canada 12:48 UTC
2.3 81 km W of Miramichi, Canada 16:38 UTC
2.0 80 km W of Miramichi, Canada 07:24 UTC
2.2 83 km E of Hamlin, Maine 07:15 UTC
2.0 82 km W of Miramichi, Canada 07:13 UTC
2.0 77 km W of Miramichi, Canada 00:20 UTC
2.3 80 km W of Miramichi, Canada 20:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:28 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.