QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km SW of Aloha, Oregon

· 7.8 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 17 kmYamhill County 37 kmMultnomah County 42 kmClark County 51 kmColumbia County 56 kmTillamook County 64 kmClackamas County 66 kmMarion County 67 kmPolk County 71 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
7.8 km below the surface
Felt
no reports yet
Nearest
Washington County, 17 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2963 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 45.4475, -122.9407. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 17 km (11 mi) SE of here earthquakes near Washington County
Yamhill County, OR 37 km (23 mi) NE of here earthquakes near Yamhill County
Multnomah County, OR 42 km (26 mi) WSW of here earthquakes near Multnomah County
Clark County, WA 51 km (31 mi) SW of here earthquakes near Clark County
Columbia County, OR 56 km (35 mi) SSE of here earthquakes near Columbia County
Tillamook County, OR 64 km (40 mi) E of here earthquakes near Tillamook County

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

Aftershocks so far

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

  1. 2.0 Washington-Oregon border region
  2. 1.9 3 km E of Sherwood, Oregon
  3. 1.8 0 km E of Sherwood, Oregon
  4. 1.7 3 km SW of Tualatin, Oregon
  5. 1.6 3 km N of West Haven, Oregon
  6. 1.6 5 km SW of Deer Island, Oregon
  7. 1.6 7 km E of Molalla, Oregon
  8. 1.6 2 km E of Sherwood, Oregon
  9. 1.5 3 km SSW of Beaverton, Oregon
  10. 1.9 3 km WSW of Dundee, Oregon
  11. 1.5 18 km W of Yamhill, Oregon
  12. 1.6 1 km SSW of Cherry Grove, Washington
  13. 2.4 3 km WNW of Molalla, Oregon
  14. 1.5 4 km NW of North Portland, Oregon
  15. 1.5 Washington-Oregon border region

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.