QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

6 km SW of Port Hadlock-Irondale, Washington

· -0.4 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 23 kmKitsap County 42 kmJefferson County 55 kmSan Juan County 60 kmMason County 75 kmClallam County 79 kmSnohomish County 81 kmKing County 94 kmSkagit County 94 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
-0.4 km below the surface
Felt
no reports yet
Nearest
Island County, 23 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2055 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 7.1 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 7.1 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 47.9927, -122.8468. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 23 km (14 mi) SW of here earthquakes near Island County
Kitsap County, WA 42 km (26 mi) NNW of here earthquakes near Kitsap County
Jefferson County, WA 55 km (34 mi) ENE of here earthquakes near Jefferson County
San Juan County, WA 60 km (37 mi) SSE of here earthquakes near San Juan County
Mason County, WA 75 km (47 mi) NNE of here earthquakes near Mason County
Clallam County, WA 79 km (49 mi) E of here earthquakes near Clallam County

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

Aftershocks so far

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

  1. 1.7 2 km S of River Road, Washington
  2. 2.4 12 km SSE of Friday Harbor, Washington
  3. 1.8 5 km N of Lofall, Washington
  4. 1.9 8 km ENE of Port Townsend, Washington
  5. 1.7 1 km NNE of Enetai, Washington
  6. 1.9 2 km NE of Keyport, Washington
  7. 1.8 5 km SSW of Port Ludlow, Washington
  8. 1.7 11 km WNW of Coupeville, Washington
  9. 1.5 1 km SSW of Lynnwood, Washington
  10. 1.6 16 km NNW of Jamestown, Washington
  11. 1.8 1 km NE of Oak Harbor, Washington
  12. 1.7 2 km ENE of Bainbridge Island, Washington
  13. 1.9 2 km NW of Indianola, Washington
  14. 2.5 13 km WNW of Ault Field, Washington
  15. 1.8 5 km SSW of Port Ludlow, 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

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