QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km SW of Scappoose, Oregon

· 16 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 19 kmColumbia County 28 kmClark County 38 kmMultnomah County 46 kmYamhill County 57 kmCowlitz County 59 kmClatsop County 68 kmTillamook County 68 kmWahkiakum County 75 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 1.8 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Washington County, 19 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 340 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 45.7025, -122.9658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 19 km (12 mi) NNE of here earthquakes near Washington County
Columbia County, OR 28 km (17 mi) SSE of here earthquakes near Columbia County
Clark County, WA 38 km (24 mi) WSW of here earthquakes near Clark County
Multnomah County, OR 46 km (29 mi) WNW of here earthquakes near Multnomah County
Yamhill County, OR 57 km (36 mi) NNE of here earthquakes near Yamhill County
Cowlitz County, WA 59 km (37 mi) SSW of here earthquakes near Cowlitz County

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

Aftershocks so far

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

  1. 1.5 5 km NNW of Venersborg, Washington
  2. 2.0 10 km SSE of Scappoose, Oregon
  3. 1.6 5 km WSW of Yacolt, Washington
  4. 1.8 4 km WSW of Yacolt, Washington
  5. 2.1 4 km W of Yacolt, Washington
  6. 1.6 8 km SW of Vernonia, Oregon
  7. 1.8 3 km E of Kalama, Washington
  8. 1.5 3 km WSW of Kalama, Washington
  9. 1.6 2 km NE of Lewisville, Washington
  10. 2.1 4 km WSW of Yacolt, Washington
  11. 1.9 1 km SE of Vancouver, Washington
  12. 1.6 5 km SSW of Yacolt, Washington
  13. 1.9 21 km W of Forest Grove, Oregon
  14. 1.6 4 km NNE of Kalama, Washington
  15. 1.5 2 km SSW of Yacolt, 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.