QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

4 km NNE of Kalama, Washington

· -0.3 km deep · released about 9 lb of TNT

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10 km30 km60 km120 km N Cowlitz County 20 kmColumbia County 23 kmClark County 40 kmWahkiakum County 54 kmWashington County 59 kmMultnomah County 64 kmSkamania County 67 kmClatsop County 68 kmLewis County 68 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 20 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 607 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 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.7 about 9 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 46.0492, -122.8232. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 20 km (12 mi) SW of here earthquakes near Cowlitz County
Columbia County, OR 23 km (14 mi) ENE of here earthquakes near Columbia County
Clark County, WA 40 km (25 mi) NW of here earthquakes near Clark County
Wahkiakum County, WA 54 km (33 mi) ESE of here earthquakes near Wahkiakum County
Washington County, OR 59 km (37 mi) NNE of here earthquakes near Washington County
Multnomah County, OR 64 km (40 mi) NNW of here earthquakes near Multnomah County

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

Aftershocks so far

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

  1. 1.6 12 km SW of Mossyrock, Washington
  2. 1.7 3 km NW of Venersborg, Washington
  3. 1.6 10 km SSE of Toledo, Washington
  4. 1.6 4 km SSW of Amboy, Washington
  5. 1.6 5 km SW of Yacolt, Washington
  6. 1.8 10 km NE of Castle Rock, Washington
  7. 1.7 5 km SSE of Yacolt, Washington
  8. 1.9 21 km SSE of Mossyrock, Washington
  9. 1.6 6 km NNW of Clatskanie, Oregon
  10. 1.5 10 km NE of Castle Rock, Washington
  11. 1.6 7 km NE of Castle Rock, Washington
  12. 1.7 10 km NE of Castle Rock, Washington
  13. 2.1 18 km N of Amboy, Washington
  14. 1.9 2 km WNW of Saint Helens, Oregon
  15. 1.6 5 km NNE of Venersborg, 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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