QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

5 km N of Lofall, Washington

· -0.3 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 25 kmIsland County 33 kmJefferson County 64 kmMason County 68 kmSnohomish County 71 kmKing County 75 kmSan Juan County 79 kmSkagit County 94 kmClallam County 95 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 25 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1700 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 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 47.8620, -122.6688. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 25 km (15 mi) N of here earthquakes near Kitsap County
Island County, WA 33 km (20 mi) S of here earthquakes near Island County
Jefferson County, WA 64 km (40 mi) E of here earthquakes near Jefferson County
Mason County, WA 68 km (42 mi) NNE of here earthquakes near Mason County
Snohomish County, WA 71 km (44 mi) WSW of here earthquakes near Snohomish County
King County, WA 75 km (47 mi) NW of here earthquakes near King County

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

Aftershocks so far

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

  1. 1.6 5 km W of Burley, Washington
  2. 1.5 2 km SW of Gorst, Washington
  3. 1.9 1 km ENE of Enetai, Washington
  4. 1.6 0 km WSW of Esperance, Washington
  5. 1.6 1 km NNW of Keyport, Washington
  6. 1.9 0 km W of Keyport, Washington
  7. 1.6 5 km SSW of Port Ludlow, Washington
  8. 1.6 3 km N of Kingston, Washington
  9. 2.4 1 km SE of Manchester, Washington
  10. 1.7 6 km WNW of Gorst, Washington
  11. 1.6 Puget Sound region, Washington
  12. 1.5 4 km SSW of Clinton, Washington
  13. 1.7 4 km SW of White Center, Washington
  14. 1.8 3 km WSW of White Center, Washington
  15. 1.8 3 km NNW of Picnic Point, 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.