QuakeIndex

explosion · reviewed by a seismologist

M 2.4ml

11 km S of Westport, Oregon

· -0.4 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Columbia County 25 kmClatsop County 26 kmWahkiakum County 30 kmCowlitz County 57 kmWashington County 57 kmPacific County 66 kmTillamook County 71 kmClark County 74 kmYamhill County 87 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 2.4 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Columbia County, 25 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2683 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 46.0310, -123.3735. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Columbia County, OR 25 km (15 mi) WNW of here earthquakes near Columbia County
Clatsop County, OR 26 km (16 mi) E of here earthquakes near Clatsop County
Wahkiakum County, WA 30 km (18 mi) S of here earthquakes near Wahkiakum County
Cowlitz County, WA 57 km (35 mi) WSW of here earthquakes near Cowlitz County
Washington County, OR 57 km (36 mi) NNW of here earthquakes near Washington County
Pacific County, WA 66 km (41 mi) SSE 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. 1.9 Washington-Oregon border region
  2. 1.7 3 km NW of West Longview, Washington
  3. 2.7 11 km W of Deer Island, Oregon
  4. 1.7 1 km N of Deer Island, Oregon
  5. 1.9 12 km WNW of Scappoose, Oregon
  6. 1.5 10 km W of Vernonia, Oregon
  7. 1.7 12 km NNE of Vernonia, Oregon
  8. 1.5 10 km NNE of Vernonia, Oregon
  9. 1.8 4 km NNW of Skamokawa Valley, Washington
  10. 1.7 3 km E of Prescott, Oregon
  11. 1.8 3 km WNW of Saint Helens, Oregon
  12. 1.9 19 km WSW of Vernonia, Oregon
  13. 1.6 2 km WNW of Saint Helens, Oregon
  14. 2.1 1 km WNW of Deer Island, Oregon
  15. 1.5 8 km NE of Nehalem, 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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