QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

10 km N of Mill City, Oregon

· -0.5 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 9 kmLinn County 40 kmClackamas County 42 kmPolk County 71 kmMultnomah County 78 kmYamhill County 78 kmBenton County 83 kmWashington County 91 kmHood River County 99 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Marion County, 9 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1983 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 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 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× 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 44.8493, -122.4957. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 9 km (5 mi) SE of here earthquakes near Marion County
Linn County, OR 40 km (25 mi) N of here earthquakes near Linn County
Clackamas County, OR 42 km (26 mi) SW of here earthquakes near Clackamas County
Polk County, OR 71 km (44 mi) E of here earthquakes near Polk County
Multnomah County, OR 78 km (48 mi) S of here earthquakes near Multnomah County
Yamhill County, OR 78 km (49 mi) SE of here earthquakes near Yamhill 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. 2.1 Oregon
  2. 2.0 3 km ENE of Millersburg, Oregon
  3. 1.6 5 km SSW of Scotts Mills, Oregon
  4. 1.7 17 km SE of Molalla, Oregon
  5. 1.6 5 km N of Waterloo, Oregon
  6. 1.7 13 km S of Estacada, Oregon
  7. 1.6 4 km E of Lebanon, Oregon
  8. 1.8 4 km WNW of Mehama, Oregon
  9. 1.7 6 km ESE of Molalla, Oregon
  10. 1.7 13 km ESE of Scotts Mills, Oregon
  11. 1.8 2 km W of Mehama, Oregon
  12. 1.8 3 km W of Mehama, Oregon
  13. 1.7 8 km SE of Molalla, Oregon
  14. 2.0 3 km W of Mehama, Oregon
  15. 1.9 6 km ENE of Lebanon, 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.