QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km S of Scappoose, Oregon

· 22 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 22 kmClark County 32 kmColumbia County 33 kmMultnomah County 38 kmYamhill County 59 kmCowlitz County 60 kmTillamook County 73 kmClatsop County 75 kmClackamas County 78 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
22 km below the surface
Felt
no reports yet
Nearest
Washington County, 22 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 958 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 45.6780, -122.8747. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 22 km (14 mi) NE of here earthquakes near Washington County
Clark County, WA 32 km (20 mi) WSW of here earthquakes near Clark County
Columbia County, OR 33 km (21 mi) SSE of here earthquakes near Columbia County
Multnomah County, OR 38 km (24 mi) WNW of here earthquakes near Multnomah County
Yamhill County, OR 59 km (37 mi) NE of here earthquakes near Yamhill County
Cowlitz County, WA 60 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

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

  1. 1.6 10 km WSW of Felida, Washington
  2. 1.6 4 km ENE of Lafayette, Oregon
  3. 1.5 4 km SSW of Aloha, Oregon
  4. 2.0 4 km N of Newberg, Oregon
  5. 1.7 4 km NE of Lafayette, Oregon
  6. 1.5 2 km WSW of Stafford, Oregon
  7. 2.0 5 km NW of North Portland, Oregon
  8. 2.1 1 km ESE of Banks, Oregon
  9. 1.6 3 km NNE of Washougal, Washington
  10. 1.6 5 km ENE of Prescott, Oregon
  11. 1.7 4 km ENE of Lafayette, Oregon
  12. 2.2 0 km SE of Barberton, Washington
  13. 2.0 4 km NNE of Lafayette, Oregon
  14. 1.6 1 km WSW of Kalama, Washington
  15. 1.7 4 km NNE of Kalama, 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.