QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

0 km WSW of Aloha, Oregon

· -0.1 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 19 kmMultnomah County 36 kmClark County 43 kmYamhill County 44 kmColumbia County 52 kmClackamas County 65 kmTillamook County 69 kmMarion County 70 kmPolk 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 1.6 (ml)
Depth
-0.1 km below the surface
Felt
no reports yet
Nearest
Washington County, 19 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 565 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 45.4925, -122.8762. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 19 km (12 mi) ESE of here earthquakes near Washington County
Multnomah County, OR 36 km (23 mi) W of here earthquakes near Multnomah County
Clark County, WA 43 km (27 mi) SW of here earthquakes near Clark County
Yamhill County, OR 44 km (27 mi) NE of here earthquakes near Yamhill County
Columbia County, OR 52 km (33 mi) SSE of here earthquakes near Columbia County
Clackamas County, OR 65 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

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

  1. 2.0 6 km NE of Amity, Oregon
  2. 1.6 2 km ESE of Lewisville, Washington
  3. 1.7 2 km WSW of Columbia City, Oregon
  4. 1.5 2 km SSE of Lewisville, Washington
  5. 2.0 1 km NNW of Salmon Creek, Washington
  6. 1.6 Washington-Oregon border region
  7. 1.5 13 km ENE of Vernonia, Oregon
  8. 1.8 3 km N of Wilsonville, Oregon
  9. 1.8 4 km SW of North Portland, Oregon
  10. 1.9 4 km ENE of Lafayette, Oregon
  11. 1.5 0 km W of Garden Home-Whitford, Oregon
  12. 1.5 5 km ENE of Lewisville, Washington
  13. 1.5 0 km N of Tigard, Oregon
  14. 1.8 2 km S of Saint Helens, Oregon
  15. 1.6 5 km E of Lewisville, 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.