QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

31 km N of Amboy, Washington

· -0.8 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 20 kmSkamania County 41 kmLewis County 43 kmClark County 47 kmColumbia County 58 kmMultnomah County 72 kmWahkiakum County 78 kmWashington County 88 kmThurston County 88 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
-0.8 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 20 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 397 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 46.1928, -122.4230. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 20 km (12 mi) E of here earthquakes near Cowlitz County
Skamania County, WA 41 km (25 mi) WNW of here earthquakes near Skamania County
Lewis County, WA 43 km (27 mi) S of here earthquakes near Lewis County
Clark County, WA 47 km (29 mi) N of here earthquakes near Clark County
Columbia County, OR 58 km (36 mi) ENE of here earthquakes near Columbia County
Multnomah County, OR 72 km (45 mi) N of here earthquakes near Multnomah County

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

Aftershocks so far

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

  1. 1.8 4 km WSW of Yacolt, Washington
  2. 1.8 27 km N of Amboy, Washington
  3. 2.1 4 km W of Yacolt, Washington
  4. 1.8 3 km E of Kalama, Washington
  5. 2.3 37 km NNE of Amboy, Washington
  6. 1.5 3 km WSW of Kalama, Washington
  7. 1.6 2 km NE of Lewisville, Washington
  8. 2.6 18 km NE of Amboy, Washington
  9. 1.5 37 km NNE of Amboy, Washington
  10. 1.6 20 km E of Castle Rock, Washington
  11. 1.6 38 km NE of Amboy, Washington
  12. 2.1 4 km WSW of Yacolt, Washington
  13. 1.6 9 km S of Mossyrock, Washington
  14. 1.9 38 km NE of Amboy, Washington
  15. 1.6 5 km SSW of Yacolt, 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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