QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

3 km NNW of Oso, Washington

· 1.0 km deep · released about 7.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 24 kmSnohomish County 30 kmIsland County 56 kmWhatcom County 61 kmSan Juan County 89 kmKitsap County 90 kmKing County 90 kmChelan County 110 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 1.6 (ml)
Depth
1.0 km below the surface
Felt
no reports yet
Nearest
Skagit County, 24 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1025 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 7.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.3 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 48.2980, -121.9430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 24 km (15 mi) SSW of here earthquakes near Skagit County
Snohomish County, WA 30 km (19 mi) NNW of here earthquakes near Snohomish County
Island County, WA 56 km (35 mi) ENE of here earthquakes near Island County
Whatcom County, WA 61 km (38 mi) S of here earthquakes near Whatcom County
San Juan County, WA 89 km (55 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 90 km (56 mi) NE of here earthquakes near Kitsap 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. 2.8 4 km W of Mount Vernon, Washington
  2. 1.7 4 km WSW of Mount Vernon, Washington
  3. 2.6 4 km W of Mount Vernon, Washington
  4. 1.9 4 km W of Mount Vernon, Washington
  5. 1.7 8 km NNE of Sedro-Woolley, Washington
  6. 2.0 1 km ENE of Granite Falls, Washington
  7. 1.7 7 km NNE of May Creek, Washington
  8. 1.9 3 km W of Mount Vernon, Washington
  9. 2.9 3 km W of Mount Vernon, Washington
  10. 2.0 3 km S of Alger, Washington
  11. 1.7 4 km W of Mount Vernon, Washington
  12. 1.7 4 km WSW of Mount Vernon, Washington
  13. 1.6 2 km E of Granite Falls, Washington
  14. 1.7 5 km WSW of Mount Vernon, Washington
  15. 2.4 4 km W of Mount Vernon, 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 4.6 on 2019-07-12 — it released about 31,000 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.