QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

2 km W of Toledo, Washington

· 4.2 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 31 kmLewis County 42 kmWahkiakum County 45 kmThurston County 56 kmColumbia County 57 kmPacific County 70 kmClatsop County 78 kmClark County 80 kmSkamania County 85 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 1.7 (ml)
Depth
4.2 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 31 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2817 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 46.4365, -122.8818. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 31 km (19 mi) NNW of here earthquakes near Cowlitz County
Lewis County, WA 42 km (26 mi) WSW of here earthquakes near Lewis County
Wahkiakum County, WA 45 km (28 mi) ENE of here earthquakes near Wahkiakum County
Thurston County, WA 56 km (35 mi) S of here earthquakes near Thurston County
Columbia County, OR 57 km (35 mi) NNE of here earthquakes near Columbia County
Pacific County, WA 70 km (44 mi) E of here earthquakes near Pacific County

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

Aftershocks so far

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

  1. 1.7 3 km NW of West Longview, Washington
  2. 1.6 4 km W of West Longview, Washington
  3. 1.6 14 km SE of Mossyrock, Washington
  4. 1.8 3 km SW of Cathlamet, Washington
  5. 1.5 28 km NNW of Amboy, Washington
  6. 1.8 9 km NW of West Longview, Washington
  7. 1.8 4 km NW of West Longview, Washington
  8. 2.9 1 km WSW of Onalaska, Washington
  9. 2.1 10 km WSW of Chehalis, Washington
  10. 1.6 2 km WNW of Kalama, Washington
  11. 2.5 16 km NE of Kalama, Washington
  12. 1.5 3 km ENE of East Cathlamet, Washington
  13. 3.1 3 km NNE of Onalaska, Washington
  14. 1.6 14 km SSW of Morton, Washington
  15. 1.6 21 km SSE of Mossyrock, 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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