QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km ESE of Port Ludlow, Washington

· 21 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 27 kmKitsap County 31 kmSnohomish County 66 kmJefferson County 68 kmSan Juan County 74 kmMason County 75 kmKing County 76 kmSkagit County 88 kmClallam County 96 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
21 km below the surface
Felt
no reports yet
Nearest
Island County, 27 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1595 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 47.9168, -122.6322. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 27 km (17 mi) S of here earthquakes near Island County
Kitsap County, WA 31 km (19 mi) N of here earthquakes near Kitsap County
Snohomish County, WA 66 km (41 mi) WSW of here earthquakes near Snohomish County
Jefferson County, WA 68 km (42 mi) E of here earthquakes near Jefferson County
San Juan County, WA 74 km (46 mi) SSE of here earthquakes near San Juan County
Mason County, WA 75 km (47 mi) NNE of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.8 0 km N of Enetai, Washington
  2. 2.1 3 km SSE of Quilcene, Washington
  3. 1.7 2 km ESE of Enetai, Washington
  4. 1.7 4 km SE of Quilcene, Washington
  5. 1.5 4 km SW of Port Ludlow, Washington
  6. 1.6 4 km ESE of Quilcene, Washington
  7. 2.0 3 km WNW of Gorst, Washington
  8. 1.7 5 km SSE of Quilcene, Washington
  9. 1.6 0 km SW of Esperance, Washington
  10. 1.5 6 km WSW of Port Ludlow, Washington
  11. 1.5 Puget Sound region, Washington
  12. 1.7 Puget Sound region, Washington
  13. 2.2 7 km WSW of Seattle, Washington
  14. 1.9 3 km NNE of White Center, Washington
  15. 1.7 4 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

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