QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

8 km SE of Molalla, Oregon

· -0.4 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 23 kmClackamas County 25 kmMultnomah County 50 kmYamhill County 66 kmLinn County 68 kmWashington County 69 kmPolk County 74 kmClark County 75 kmHood River County 80 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
-0.4 km below the surface
Felt
no reports yet
Nearest
Marion County, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2348 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 45.0970, -122.4960. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 23 km (14 mi) NNE of here earthquakes near Marion County
Clackamas County, OR 25 km (15 mi) WSW of here earthquakes near Clackamas County
Multnomah County, OR 50 km (31 mi) S of here earthquakes near Multnomah County
Yamhill County, OR 66 km (41 mi) ESE of here earthquakes near Yamhill County
Linn County, OR 68 km (42 mi) N of here earthquakes near Linn County
Washington County, OR 69 km (43 mi) SE of here earthquakes near Washington County

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

Aftershocks so far

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

  1. 1.7 8 km SE of Molalla, Oregon
  2. 2.0 3 km W of Mehama, Oregon
  3. 1.6 3 km ESE of Sherwood, Oregon
  4. 2.0 2 km WNW of Molalla, Oregon
  5. 1.7 4 km ESE of Silverton, Oregon
  6. 1.9 3 km NNE of Hubbard, Oregon
  7. 1.7 Washington-Oregon border region
  8. 1.7 5 km SSW of Saint Paul, Oregon
  9. 1.5 7 km ESE of Estacada, Oregon
  10. 1.7 8 km E of Molalla, Oregon
  11. 1.6 5 km E of Hubbard, Oregon
  12. 1.5 6 km SE of Molalla, Oregon
  13. 1.8 3 km W of Saint Paul, Oregon
  14. 1.6 14 km ESE of Scotts Mills, Oregon
  15. 1.8 3 km NW of Mount Hood Village, 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.