QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3 km ENE of Custer, Washington

· 14 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Whatcom County 57 kmSan Juan County 60 kmSkagit County 75 kmIsland County 86 kmSnohomish County 115 km
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
Magnitude
M 1.5 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Whatcom County, 57 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1761 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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

Epicentre 48.9323, -122.5985. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Whatcom County, WA 57 km (35 mi) W of here earthquakes near Whatcom County
San Juan County, WA 60 km (37 mi) NE of here earthquakes near San Juan County
Skagit County, WA 75 km (47 mi) NW of here earthquakes near Skagit County
Island County, WA 86 km (54 mi) N of here earthquakes near Island County
Snohomish County, WA 115 km (72 mi) NNW of here earthquakes near Snohomish County
Clallam County, WA 132 km (82 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

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

  1. 1.6 10 km ESE of Orcas, Washington
  2. 2.5 14 km W of Marietta, Washington
  3. 1.5 10 km W of Chilliwack, Canada
  4. 2.1 5 km SW of Aldergrove, Canada
  5. 1.7 5 km WSW of Aldergrove, Canada
  6. 1.5 Washington
  7. 1.5 12 km ENE of Mission, Canada
  8. 1.8 2 km SW of Deming, Washington
  9. 1.6 11 km ENE of Abbotsford, Canada
  10. 1.5 6 km ENE of Abbotsford, Canada
  11. 1.5 5 km ENE of Abbotsford, Canada
  12. 2.3 6 km WNW of Orcas, Washington
  13. 1.6 6 km W of Orcas, Washington
  14. 2.7 6 km WNW of Orcas, Washington
  15. 2.1 7 km SSW of Birch Bay, Washington

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.