QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

5 km SSW of Port Ludlow, Washington

· -0.3 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 27 kmIsland County 31 kmJefferson County 62 kmMason County 68 kmSnohomish County 72 kmSan Juan County 76 kmKing County 78 kmClallam County 92 kmSkagit 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 1.7 (ml)
Depth
-0.3 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 27 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2039 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 10 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 1,500,000× 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 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 47.8767, -122.7008. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 27 km (17 mi) N of here earthquakes near Kitsap County
Island County, WA 31 km (20 mi) S of here earthquakes near Island County
Jefferson County, WA 62 km (39 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 72 km (45 mi) WSW of here earthquakes near Snohomish County
San Juan County, WA 76 km (47 mi) SSE of here earthquakes near San Juan County

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

Aftershocks so far

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

  1. 1.7 0 km NNE of Navy Yard City, Washington
  2. 1.9 2 km NE of Keyport, Washington
  3. 1.6 1 km S of Enetai, Washington
  4. 1.8 5 km SSW of Port Ludlow, Washington
  5. 1.7 11 km WNW of Coupeville, Washington
  6. 1.5 1 km SSW of Lynnwood, Washington
  7. 1.8 1 km NE of Oak Harbor, Washington
  8. 1.7 2 km ENE of Bainbridge Island, Washington
  9. 1.9 2 km NW of Indianola, Washington
  10. 1.6 3 km SSW of Bethel, Washington
  11. 1.8 4 km N of Belfair, Washington
  12. 1.8 5 km SSW of Port Ludlow, Washington
  13. 1.7 1 km ESE of Enetai, Washington
  14. 1.7 12 km ENE of Jamestown, Washington
  15. 1.5 1 km ENE of Bainbridge Island, 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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