QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

11 km W of Greenwater, Washington

· -0.7 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 29 kmKing County 37 kmLewis County 78 kmThurston County 82 kmKitsap County 84 kmKittitas County 85 kmSnohomish County 100 kmMason County 106 kmYakima County 112 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
-0.7 km below the surface
Felt
no reports yet
Nearest
Pierce County, 29 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1248 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 7.6 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 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× 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 7.6 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 47.1555, -121.7992. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 29 km (18 mi) ENE of here earthquakes near Pierce County
King County, WA 37 km (23 mi) S of here earthquakes near King County
Lewis County, WA 78 km (48 mi) NE of here earthquakes near Lewis County
Thurston County, WA 82 km (51 mi) ENE of here earthquakes near Thurston County
Kitsap County, WA 84 km (52 mi) SE of here earthquakes near Kitsap County
Kittitas County, WA 85 km (53 mi) W of here earthquakes near Kittitas County

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

Aftershocks so far

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

  1. 2.4 10 km NNE of Ashford, Washington
  2. 1.8 3 km WSW of Wilderness Rim, Washington
  3. 1.9 0 km E of East Renton Highlands, Washington
  4. 1.8 1 km WNW of Mirrormont, Washington
  5. 3.1 7 km WSW of Snoqualmie, Washington
  6. 1.6 5 km S of Wilderness Rim, Washington
  7. 1.6 2 km WNW of Mirrormont, Washington
  8. 1.6 12 km ESE of Enumclaw, Washington
  9. 1.5 1 km ESE of Kapowsin, Washington
  10. 1.8 12 km NE of Ashford, Washington
  11. 1.6 2 km SSW of Mirrormont, Washington
  12. 1.5 8 km E of Ashford, Washington
  13. 2.3 2 km E of Issaquah, Washington
  14. 2.0 7 km ENE of Fall City, Washington
  15. 1.5 10 km WSW of Easton, 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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