5 km WSW of Aldergrove, Canada

2023-05-30 20:49 UTC · 15 km deep · released about 9 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: 2023-05-30 20:49 UTC
Magnitude: M 1.7 (ml)
Depth: 15 km below the surface
Felt: no reports yet
Nearest: Whatcom County, 56 km ESE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1215 days ago · we first saw it 1215 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
Around the size people start to feel M 3.0 110× the energy of this one
This earthquake M 1.7 about 9 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 49.0395, -122.5452. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Whatcom County, WA	56 km (35 mi)	WNW of here	earthquakes near Whatcom County
San Juan County, WA	72 km (45 mi)	NE of here	earthquakes near San Juan County
Skagit County, WA	81 km (50 mi)	NW of here	earthquakes near Skagit County
Island County, WA	98 km (61 mi)	N of here	earthquakes near Island County
Snohomish County, WA	124 km (77 mi)	NNW of here	earthquakes near Snohomish County
Clallam County, WA	143 km (89 mi)	NE of here	earthquakes near Clallam County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1.5 12 km ENE of Mission, Canada 23:12 UTC
1.8 9 km WNW of White Rock, Canada 06:52 UTC
1.8 8 km SSW of Chilliwack, Canada 22:43 UTC
2.0 7 km SW of Chilliwack, Canada 20:32 UTC
1.7 7 km SW of Chilliwack, Canada 22:14 UTC
2.1 5 km WNW of Lynden, Washington 02:25 UTC
1.8 8 km SSW of Birch Bay, Washington 12:30 UTC
1.6 9 km NNW of Maple Ridge, Canada 19:21 UTC
1.8 10 km S of Point Roberts, Washington 05:47 UTC
2.3 12 km NNE of Maple Ridge, Canada 04:28 UTC
1.6 8 km SW of Chilliwack, Canada 18:52 UTC
1.5 7 km ENE of Abbotsford, Canada 22:26 UTC
1.7 10 km NNE of Mission, Canada 21:36 UTC
1.5 5 km WSW of Ferndale, Washington 20:50 UTC
2.5 11 km NE of Abbotsford, Canada 19:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:32 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.