QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

5 km WSW of Coupeville, Washington

· -0.2 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 8 kmSan Juan County 43 kmKitsap County 63 kmJefferson County 73 kmSnohomish County 75 kmSkagit County 76 kmClallam County 85 kmWhatcom County 98 kmMason County 100 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Island County, 8 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2243 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 6.6 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 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 48.2048, -122.7498. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 8 km (5 mi) NW of here earthquakes near Island County
San Juan County, WA 43 km (26 mi) SE of here earthquakes near San Juan County
Kitsap County, WA 63 km (39 mi) N of here earthquakes near Kitsap County
Jefferson County, WA 73 km (45 mi) NE of here earthquakes near Jefferson County
Snohomish County, WA 75 km (47 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 76 km (47 mi) WSW of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 1.7 2 km ESE of Burlington, Washington
  2. 2.2 3 km ESE of Burlington, Washington
  3. 1.7 12 km ENE of Jamestown, Washington
  4. 2.2 2 km N of Mount Vernon, Washington
  5. 1.8 3 km NW of Mount Vernon, Washington
  6. 2.3 7 km SSE of Coupeville, Washington
  7. 1.7 6 km NNW of Lofall, Washington
  8. 2.0 4 km NE of Oak Bay, Canada
  9. 1.8 5 km S of Hansville, Washington
  10. 1.6 8 km NE of Jamestown, Washington
  11. 2.0 7 km NNE of Jamestown, Washington
  12. 1.8 2 km S of Clear Lake, Washington
  13. 1.6 4 km WNW of Freeland, Washington
  14. 1.5 6 km NNW of Lofall, Washington
  15. 1.6 1 km NNW of Mount Vernon, 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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