QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km SW of North Portland, Oregon

· 17 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Multnomah County 27 kmWashington County 27 kmClark County 29 kmColumbia County 47 kmYamhill County 58 kmClackamas County 64 kmCowlitz County 68 kmMarion County 78 kmSkamania County 79 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
17 km below the surface
Felt
no reports yet
Nearest
Multnomah County, 27 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1857 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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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 45.5867, -122.7538. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Multnomah County, OR 27 km (16 mi) W of here earthquakes near Multnomah County
Washington County, OR 27 km (17 mi) E of here earthquakes near Washington County
Clark County, WA 29 km (18 mi) SW of here earthquakes near Clark County
Columbia County, OR 47 km (29 mi) SSE of here earthquakes near Columbia County
Yamhill County, OR 58 km (36 mi) NE of here earthquakes near Yamhill County
Clackamas County, OR 64 km (40 mi) NW of here earthquakes near Clackamas 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. 2.5 3 km SW of Lake Shore, Washington
  2. 2.3 0 km S of Banks, Oregon
  3. 1.6 3 km SW of Lake Shore, Washington
  4. 1.5 6 km NW of North Portland, Oregon
  5. 1.9 12 km WNW of Scappoose, Oregon
  6. 1.6 Washington-Oregon border region
  7. 1.9 3 km W of Yacolt, Washington
  8. 1.7 1 km WSW of Yacolt, Washington
  9. 1.6 3 km WSW of Yacolt, Washington
  10. 1.6 3 km SW of Yacolt, Washington
  11. 1.5 10 km NNE of Vernonia, Oregon
  12. 1.5 1 km NW of Wilsonville, Oregon
  13. 1.6 3 km WSW of Yacolt, Washington
  14. 1.8 8 km S of Scappoose, Oregon
  15. 1.8 3 km WNW of Saint Helens, 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

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