QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

3 km ENE of Granite Falls, Washington

· -0.8 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 13 kmSkagit County 45 kmIsland County 55 kmKing County 68 kmKitsap County 74 kmWhatcom County 83 kmSan Juan County 98 kmChelan County 101 kmPierce County 118 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
-0.8 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 13 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2708 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 48.0988, -121.9293. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 13 km (8 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 45 km (28 mi) S of here earthquakes near Skagit County
Island County, WA 55 km (34 mi) E of here earthquakes near Island County
King County, WA 68 km (42 mi) N of here earthquakes near King County
Kitsap County, WA 74 km (46 mi) NE of here earthquakes near Kitsap County
Whatcom County, WA 83 km (52 mi) S of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.9 3 km NW of Lake Marcel-Stillwater, Washington
  2. 2.1 3 km ENE of Granite Falls, Washington
  3. 1.7 3 km ENE of Cathcart, Washington
  4. 2.0 6 km E of Lake Marcel-Stillwater, Washington
  5. 1.9 2 km ENE of Granite Falls, Washington
  6. 2.3 3 km SSW of Clinton, Washington
  7. 1.6 2 km E of Snohomish, Washington
  8. 1.9 3 km ENE of Granite Falls, Washington
  9. 1.8 5 km WSW of Darrington, Washington
  10. 1.7 2 km ESE of Lake Marcel-Stillwater, Washington
  11. 1.8 6 km WSW of Clinton, Washington
  12. 2.6 6 km WSW of Clinton, Washington
  13. 2.2 8 km SW of Warm Beach, Washington
  14. 2.6 1 km NE of Lake Marcel-Stillwater, Washington
  15. 1.7 2 km WNW of Lake Marcel-Stillwater, 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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