QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

3 km NNW of West Longview, Washington

· -0.5 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 26 kmColumbia County 29 kmWahkiakum County 33 kmClatsop County 57 kmClark County 63 kmLewis County 64 kmPacific County 71 kmWashington County 72 kmThurston County 83 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 1.9 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 26 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 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 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 46.2013, -123.0125. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 26 km (16 mi) W of here earthquakes near Cowlitz County
Columbia County, OR 29 km (18 mi) N of here earthquakes near Columbia County
Wahkiakum County, WA 33 km (21 mi) ESE of here earthquakes near Wahkiakum County
Clatsop County, OR 57 km (35 mi) ENE of here earthquakes near Clatsop County
Clark County, WA 63 km (39 mi) NW of here earthquakes near Clark County
Lewis County, WA 64 km (40 mi) SW of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 1.5 10 km SSE of Toledo, Washington
  2. 1.7 10 km NE of Castle Rock, Washington
  3. 1.9 12 km WNW of Scappoose, Oregon
  4. 1.5 10 km W of Vernonia, Oregon
  5. 1.7 12 km NNE of Vernonia, Oregon
  6. 1.5 10 km NNE of Vernonia, Oregon
  7. 1.5 11 km SSE of Toledo, Washington
  8. 1.8 4 km NNW of Skamokawa Valley, Washington
  9. 1.7 3 km E of Prescott, Oregon
  10. 1.5 9 km SSE of Toledo, Washington
  11. 1.8 3 km WNW of Saint Helens, Oregon
  12. 1.8 9 km NE of Castle Rock, Washington
  13. 1.8 11 km SSE of Toledo, Washington
  14. 1.5 6 km ENE of Prescott, Oregon
  15. 1.7 7 km ENE of Prescott, Oregon

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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