QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km NNE of Duvall, Washington

· 25 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 33 kmKing County 34 kmKitsap County 54 kmIsland County 67 kmSkagit County 79 kmPierce County 83 kmChelan County 100 kmMason County 103 kmThurston County 115 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 1.8 (ml)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 33 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2561 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 47.7890, -121.9590. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 33 km (20 mi) SSW of here earthquakes near Snohomish County
King County, WA 34 km (21 mi) NNW of here earthquakes near King County
Kitsap County, WA 54 km (34 mi) ENE of here earthquakes near Kitsap County
Island County, WA 67 km (42 mi) SE of here earthquakes near Island County
Skagit County, WA 79 km (49 mi) S of here earthquakes near Skagit County
Pierce County, WA 83 km (52 mi) N of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 1.5 2 km SSW of Carnation, Washington
  2. 1.8 3 km SSE of Kingston, Washington
  3. 1.8 1 km S of Snoqualmie, Washington
  4. 1.8 2 km S of Monroe, Washington
  5. 2.0 2 km SE of Duvall, Washington
  6. 1.8 2 km ENE of Maple Valley, Washington
  7. 1.6 4 km E of Cathcart, Washington
  8. 1.7 2 km ENE of Granite Falls, Washington
  9. 2.2 8 km E of Carnation, Washington
  10. 3.2 3 km NNW of Lake Marcel-Stillwater, Washington
  11. 1.8 1 km E of Granite Falls, Washington
  12. 1.5 1 km NNW of Maple Valley, Washington
  13. 1.6 5 km WSW of North Bend, Washington
  14. 1.6 3 km NE of Mirrormont, Washington
  15. 1.6 1 km E of Shoreline, 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 18,000 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.