QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

12 km WSW of Anacortes, Washington

· 11 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 25 kmIsland County 36 kmSkagit County 71 kmWhatcom County 80 kmSnohomish County 88 kmClallam County 92 kmJefferson County 93 kmKitsap County 93 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 2.7 (ml)
Depth
11 km below the surface
Felt
34 reports · strongest reported intensity III
Nearest
San Juan County, 25 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 88 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 34 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 48.4723, -122.7727. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 25 km (15 mi) E of here earthquakes near San Juan County
Island County, WA 36 km (22 mi) NNW of here earthquakes near Island County
Skagit County, WA 71 km (44 mi) W of here earthquakes near Skagit County
Whatcom County, WA 80 km (50 mi) WSW of here earthquakes near Whatcom County
Snohomish County, WA 88 km (55 mi) WNW of here earthquakes near Snohomish County
Clallam County, WA 92 km (57 mi) ENE of here earthquakes near Clallam 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. 2.6 2 km ENE of Mount Vernon, Washington
  3. 1.6 2 km ESE of Oak Harbor, Washington
  4. 1.6 2 km E of Oak Harbor, Washington
  5. 2.1 3 km E of Oak Harbor, Washington
  6. 1.7 3 km E of Oak Harbor, Washington
  7. 2.1 3 km ESE of Oak Harbor, Washington
  8. 1.6 5 km N of Anacortes, Washington
  9. 2.1 3 km E of Oak Harbor, Washington
  10. 1.9 14 km NNE of Port Angeles East, Washington
  11. 1.6 8 km WNW of Orcas, Washington
  12. 1.7 8 km WNW of Orcas, Washington
  13. 1.8 8 km WNW of Orcas, Washington
  14. 1.9 4 km E of Port Townsend, Washington
  15. 1.8 2 km ESE of Oak Harbor, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2025-03-03 — it released about 500 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.