QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

12 km WNW of Scappoose, Oregon

· -0.5 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Columbia County 17 kmWashington County 27 kmClark County 42 kmCowlitz County 53 kmMultnomah County 55 kmClatsop County 58 kmWahkiakum County 64 kmYamhill County 64 kmTillamook 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 1.9 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Columbia County, 17 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1200 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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 45.7888, -123.0300. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Columbia County, OR 17 km (11 mi) SSE of here earthquakes near Columbia County
Washington County, OR 27 km (17 mi) NNE of here earthquakes near Washington County
Clark County, WA 42 km (26 mi) W of here earthquakes near Clark County
Cowlitz County, WA 53 km (33 mi) SSW of here earthquakes near Cowlitz County
Multnomah County, OR 55 km (34 mi) WNW of here earthquakes near Multnomah County
Clatsop County, OR 58 km (36 mi) ESE of here earthquakes near Clatsop County

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

Aftershocks so far

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

  1. 1.6 5 km W of Clatskanie, Oregon
  2. 1.6 17 km WNW of Banks, Oregon
  3. 1.6 3 km NNE of West Haven, Oregon
  4. 1.6 1 km E of Lewisville, Washington
  5. 1.8 7 km WNW of Warren, Oregon
  6. 1.8 5 km NNE of La Center, Washington
  7. 2.0 8 km WNW of Warren, Oregon
  8. 1.7 14 km W of Deer Island, Oregon
  9. 2.0 1 km N of Longview, Washington
  10. 1.6 5 km S of Aloha, Oregon
  11. 1.5 7 km WNW of Forest Grove, Oregon
  12. 1.8 3 km WSW of Felida, Washington
  13. 1.7 7 km E of Kalama, Washington
  14. 2.1 2 km ENE of Ridgefield, Washington
  15. 1.5 3 km ESE of La Center, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.