QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mwr

12 km ENE of Ganges, Canada

· 17 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 47 kmIsland County 96 kmClallam County 96 kmWhatcom County 111 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 3.7 (mwr)
Depth
17 km below the surface
Felt
1016 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
San Juan County, 47 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1016 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 48.8934, -123.3477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 47 km (29 mi) NNW of here earthquakes near San Juan County
Island County, WA 96 km (59 mi) NNW of here earthquakes near Island County
Clallam County, WA 96 km (59 mi) NNE of here earthquakes near Clallam County
Whatcom County, WA 111 km (69 mi) W of here earthquakes near Whatcom County
Skagit County, WA 121 km (75 mi) WNW of here earthquakes near Skagit County
Snohomish County, WA 149 km (93 mi) NW of here earthquakes near Snohomish 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. 1.7 2 km SW of Point Roberts, Washington
  2. 1.8 3 km WSW of Point Roberts, Washington
  3. 1.7 2 km WSW of Point Roberts, Washington
  4. 1.6 2 km W of Point Roberts, Washington
  5. 2.8 10 km WSW of Friday Harbor, Washington
  6. 1.9 6 km NNE of Orcas, Washington
  7. 3.6 22 km NNE of Ganges, Canada
  8. 2.1 11 km E of North Saanich, Canada
  9. 4.0 12 km E of Saanichton, Canada
  10. 2.0 10 km NE of Saltair, Canada
  11. 1.7 12 km WNW of Orcas, Washington
  12. 1.6 9 km NW of Friday Harbor, Washington
  13. 1.6 6 km SSW of Saanichton, Canada
  14. 1.6 10 km WSW of Friday Harbor, Washington
  15. 1.9 1 km NE of Six Mile, 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.