QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

1 km NNE of Woods Creek, Washington

· -0.8 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 21 kmKing County 45 kmKitsap County 63 kmIsland County 65 kmSkagit County 67 kmChelan County 95 kmPierce County 95 kmWhatcom County 106 kmSan Juan County 113 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 1.7 (ml)
Depth
-0.8 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 21 km NNE
Status
Reviewed by a seismologist

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

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

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 47.8910, -121.8938. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 21 km (13 mi) SSW of here earthquakes near Snohomish County
King County, WA 45 km (28 mi) N of here earthquakes near King County
Kitsap County, WA 63 km (39 mi) ENE of here earthquakes near Kitsap County
Island County, WA 65 km (40 mi) ESE of here earthquakes near Island County
Skagit County, WA 67 km (42 mi) S of here earthquakes near Skagit County
Chelan County, WA 95 km (59 mi) W of here earthquakes near Chelan County

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

Aftershocks so far

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

  1. 1.8 5 km ENE of Oso, Washington
  2. 3.4 6 km ENE of Oso, Washington
  3. 1.6 11 km SSW of Gold Bar, Washington
  4. 1.5 1 km NNW of Granite Falls, Washington
  5. 2.4 7 km ENE of Fall City, Washington
  6. 2.0 7 km NE of Fall City, Washington
  7. 2.0 3 km SE of Issaquah, Washington
  8. 1.5 3 km NNE of Picnic Point, Washington
  9. 1.6 1 km SW of Bothell East, Washington
  10. 1.6 2 km ENE of Granite Falls, Washington
  11. 1.8 1 km SW of Monroe North, Washington
  12. 1.7 1 km NNW of Silvana, Washington
  13. 1.6 2 km E of Granite Falls, Washington
  14. 1.5 5 km NNE of Duvall, Washington
  15. 1.9 1 km ESE of Esperance, 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 24,000 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.