QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

6 km NW of North Portland, Oregon

· 18 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 24 kmMultnomah County 29 kmWashington County 29 kmColumbia County 41 kmCowlitz County 61 kmYamhill County 63 kmClackamas County 70 kmSkamania County 74 kmTillamook County 82 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 1.5 (ml)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Clark County, 24 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 590 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 45.6545, -122.7517. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 24 km (15 mi) WSW of here earthquakes near Clark County
Multnomah County, OR 29 km (18 mi) WNW of here earthquakes near Multnomah County
Washington County, OR 29 km (18 mi) ENE of here earthquakes near Washington County
Columbia County, OR 41 km (25 mi) SE of here earthquakes near Columbia County
Cowlitz County, WA 61 km (38 mi) S of here earthquakes near Cowlitz County
Yamhill County, OR 63 km (39 mi) NE of here earthquakes near Yamhill County

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

Aftershocks so far

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

  1. 1.6 1 km E of Lewisville, Washington
  2. 1.8 7 km WNW of Warren, Oregon
  3. 1.8 5 km NNE of La Center, Washington
  4. 1.8 3 km ENE of Venersborg, Washington
  5. 2.0 8 km WNW of Warren, Oregon
  6. 1.7 14 km W of Deer Island, Oregon
  7. 1.7 4 km NE of Lafayette, Oregon
  8. 1.7 2 km SSE of Sherwood, Oregon
  9. 1.6 5 km S of Aloha, Oregon
  10. 1.5 7 km WNW of Forest Grove, Oregon
  11. 1.8 3 km WSW of Felida, Washington
  12. 1.6 4 km WSW of Stafford, Oregon
  13. 1.7 7 km E of Kalama, Washington
  14. 1.6 4 km ESE of Sherwood, Oregon
  15. 2.1 2 km ENE of Ridgefield, 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.