QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3 km N of Union Hill-Novelty Hill, Washington

· 1.0 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 29 kmSnohomish County 43 kmKitsap County 48 kmIsland County 69 kmPierce County 74 kmSkagit County 88 kmMason County 95 kmThurston County 106 kmChelan County 106 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 1.5 (ml)
Depth
1.0 km below the surface
Felt
no reports yet
Nearest
King County, 29 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3216 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 47.7143, -122.0247. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 29 km (18 mi) NNW of here earthquakes near King County
Snohomish County, WA 43 km (26 mi) SSW of here earthquakes near Snohomish County
Kitsap County, WA 48 km (30 mi) E of here earthquakes near Kitsap County
Island County, WA 69 km (43 mi) SE of here earthquakes near Island County
Pierce County, WA 74 km (46 mi) N of here earthquakes near Pierce County
Skagit County, WA 88 km (55 mi) S of here earthquakes near Skagit 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. 1.6 1 km ENE of Enetai, Washington
  2. 1.7 2 km NNE of Southworth, Washington
  3. 2.0 2 km NE of Granite Falls, Washington
  4. 2.4 5 km SSE of May Creek, Washington
  5. 2.5 0 km ESE of Riverton, Washington
  6. 2.0 3 km E of Granite Falls, Washington
  7. 2.6 6 km SSW of Lake Morton-Berrydale, Washington
  8. 2.1 5 km SE of Lea Hill, Washington
  9. 1.7 6 km ENE of Hobart, Washington
  10. 1.8 3 km ENE of Granite Falls, Washington
  11. 1.8 8 km NE of Lake Marcel-Stillwater, Washington
  12. 1.8 3 km ENE of Granite Falls, Washington
  13. 1.8 5 km NE of Granite Falls, Washington
  14. 2.7 1 km NNW of Mountlake Terrace, Washington
  15. 1.8 10 km NNE of Lake Marcel-Stillwater, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.