QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

19 km E of Morton, Washington

· -1.0 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 28 kmSkamania County 57 kmPierce County 58 kmCowlitz County 63 kmThurston County 76 kmClark County 92 kmYakima County 99 kmColumbia County 105 kmKing County 107 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
-1.0 km below the surface
Felt
no reports yet
Nearest
Lewis County, 28 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2905 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 6.8 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 2,200,000× 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 6.8 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 46.5332, -122.0238. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 28 km (17 mi) E of here earthquakes near Lewis County
Skamania County, WA 57 km (35 mi) N of here earthquakes near Skamania County
Pierce County, WA 58 km (36 mi) S of here earthquakes near Pierce County
Cowlitz County, WA 63 km (39 mi) NE of here earthquakes near Cowlitz County
Thurston County, WA 76 km (47 mi) SE of here earthquakes near Thurston County
Clark County, WA 92 km (57 mi) NNE of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.6 6 km ESE of Ashford, Washington
  2. 1.5 22 km ENE of Ashford, Washington
  3. 1.6 14 km SSW of Morton, Washington
  4. 1.9 22 km SSE of Packwood, Washington
  5. 1.6 21 km SSE of Mossyrock, Washington
  6. 1.8 23 km ENE of Ashford, Washington
  7. 1.8 8 km E of Ashford, Washington
  8. 1.6 4 km W of Mossyrock, Washington
  9. 1.6 6 km SSW of Morton, Washington
  10. 1.6 6 km ESE of Ashford, Washington
  11. 2.2 23 km S of Morton, Washington
  12. 2.6 8 km E of Ashford, Washington
  13. 1.8 23 km SSE of Mossyrock, Washington
  14. 1.6 Washington
  15. 2.0 7 km ESE of Ashford, 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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