QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

17 km SE of Carbonado, Washington

· 11 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 22 kmKing County 57 kmLewis County 58 kmThurston County 72 kmKittitas County 93 kmKitsap County 94 kmYakima County 105 kmMason County 106 kmCowlitz County 106 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
11 km below the surface
Felt
no reports yet
Nearest
Pierce County, 22 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 842 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 46.9780, -121.8828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 22 km (14 mi) ESE of here earthquakes near Pierce County
King County, WA 57 km (35 mi) S of here earthquakes near King County
Lewis County, WA 58 km (36 mi) NE of here earthquakes near Lewis County
Thurston County, WA 72 km (45 mi) E of here earthquakes near Thurston County
Kittitas County, WA 93 km (58 mi) W of here earthquakes near Kittitas County
Kitsap County, WA 94 km (58 mi) SE of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 1.7 11 km WSW of Mineral, Washington
  2. 1.6 2 km WSW of Kapowsin, Washington
  3. 1.7 2 km SSW of Kapowsin, Washington
  4. 1.6 2 km S of Kapowsin, Washington
  5. 2.0 23 km NNE of Packwood, Washington
  6. 1.6 12 km E of Greenwater, Washington
  7. 1.8 1 km NNW of Maple Valley, Washington
  8. 2.0 8 km ESE of Ashford, Washington
  9. 1.8 8 km ESE of Carbonado, Washington
  10. 1.8 1 km S of Kapowsin, Washington
  11. 1.7 11 km E of Greenwater, Washington
  12. 2.2 11 km WSW of Mineral, Washington
  13. 1.9 2 km SW of Kapowsin, Washington
  14. 1.7 13 km W of Greenwater, Washington
  15. 1.8 2 km ESE of Buckley, 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.