QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0ml

12 km E of Saanichton, Canada

· 52 km deep · released about 13 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 13 kmIsland County 63 kmClallam County 71 kmJefferson County 89 kmSkagit County 106 kmWhatcom County 108 kmKitsap County 114 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 4.0 (ml)
Depth
52 km below the surface
Felt
2682 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Nearest
San Juan County, 13 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 583 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2682 people have reported feeling it to USGS.

How big was it?

This earthquake released about 13 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 13,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 580× the energy of this one
  3. Magna, Utah 2020 M 5.7 410× the energy of this one
  4. This earthquake M 4.0 about 13 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 28× 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

Epicentre 48.5807, -123.2478. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 13 km (8 mi) NW of here earthquakes near San Juan County
Island County, WA 63 km (39 mi) NW of here earthquakes near Island County
Clallam County, WA 71 km (44 mi) NE of here earthquakes near Clallam County
Jefferson County, WA 89 km (55 mi) NNE of here earthquakes near Jefferson County
Skagit County, WA 106 km (66 mi) W of here earthquakes near Skagit County
Whatcom County, WA 108 km (67 mi) WSW of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.7 14 km SW of Cowichan Bay, Canada
  2. 1.9 14 km NNE of Port Angeles East, Washington
  3. 1.6 8 km WNW of Orcas, Washington
  4. 1.7 8 km WNW of Orcas, Washington
  5. 1.8 8 km WNW of Orcas, Washington
  6. 1.9 10 km S of Cowichan Bay, Canada
  7. 2.2 5 km NW of Orcas, Washington
  8. 2.4 11 km S of Metchosin, Canada
  9. 1.5 7 km WNW of Friday Harbor, Washington
  10. 2.7 12 km WSW of Anacortes, Washington
  11. 1.9 10 km ESE of Salt Spring Island, Canada
  12. 1.8 8 km W of Ault Field, Washington
  13. 1.6 3 km N of Langford, Canada
  14. 1.8 10 km S of Victoria, Canada
  15. 1.6 10 km NW of Ganges, Canada

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.