QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4 km SE of Mount Vernon, Washington

· 18 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 38 kmIsland County 38 kmSnohomish County 55 kmSan Juan County 61 kmWhatcom County 61 kmKitsap County 88 kmKing County 106 kmJefferson County 112 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 2.1 (ml)
Depth
18 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Skagit County, 38 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 295 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 48.3915, -122.3012. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 38 km (23 mi) WSW of here earthquakes near Skagit County
Island County, WA 38 km (23 mi) NE of here earthquakes near Island County
Snohomish County, WA 55 km (34 mi) NW of here earthquakes near Snohomish County
San Juan County, WA 61 km (38 mi) ESE of here earthquakes near San Juan County
Whatcom County, WA 61 km (38 mi) SW of here earthquakes near Whatcom County
Kitsap County, WA 88 km (54 mi) NNE of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 2.6 2 km ENE of Mount Vernon, Washington
  2. 1.8 15 km ESE of Acme, Washington
  3. 1.6 2 km ESE of Oak Harbor, Washington
  4. 1.5 2 km E of Granite Falls, Washington
  5. 1.9 2 km NNE of Lyman, Washington
  6. 1.6 2 km E of Oak Harbor, Washington
  7. 2.1 3 km E of Oak Harbor, Washington
  8. 1.7 3 km E of Oak Harbor, Washington
  9. 1.7 3 km N of Lyman, Washington
  10. 2.2 2 km N of Lyman, Washington
  11. 2.1 3 km ESE of Oak Harbor, Washington
  12. 1.5 2 km ENE of Granite Falls, Washington
  13. 1.6 5 km N of Anacortes, Washington
  14. 2.1 3 km E of Oak Harbor, Washington
  15. 1.6 3 km E of Granite Falls, 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 4,400 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.