QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

4 km ENE of Oak Bay, Canada

· 46 km deep · released about 180 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 11 kmIsland County 55 kmClallam County 62 kmJefferson County 77 kmKitsap County 103 kmSkagit County 106 kmWhatcom County 112 kmSnohomish County 119 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 2.5 (ml)
Depth
46 km below the surface
Felt
7 reports · strongest reported intensity II
Nearest
San Juan County, 11 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 478 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 59,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.2× the energy of this one
  4. This earthquake M 2.5 about 180 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 48.4725, -123.2490. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 11 km (7 mi) WSW of here earthquakes near San Juan County
Island County, WA 55 km (34 mi) NW of here earthquakes near Island County
Clallam County, WA 62 km (39 mi) NE of here earthquakes near Clallam County
Jefferson County, WA 77 km (48 mi) NNE of here earthquakes near Jefferson County
Kitsap County, WA 103 km (64 mi) NNW of here earthquakes near Kitsap County
Skagit County, WA 106 km (66 mi) W of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 2.1 6 km ENE of Bell Hill, Washington
  2. 1.7 14 km SW of Cowichan Bay, Canada
  3. 1.9 14 km NNE of Port Angeles East, Washington
  4. 1.6 8 km WNW of Orcas, Washington
  5. 1.7 8 km WNW of Orcas, Washington
  6. 1.8 8 km WNW of Orcas, Washington
  7. 1.9 10 km S of Cowichan Bay, Canada
  8. 2.2 5 km NW of Orcas, Washington
  9. 2.4 11 km S of Metchosin, Canada
  10. 1.7 2 km S of River Road, Washington
  11. 1.5 7 km WNW of Friday Harbor, Washington
  12. 2.7 12 km WSW of Anacortes, Washington
  13. 1.9 10 km ESE of Salt Spring Island, Canada
  14. 1.8 8 km W of Ault Field, Washington
  15. 1.6 3 km N of Langford, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2025-03-03 — it released about 930 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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