QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

5 km SSE of Molalla, Oregon

· -1.1 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 22 kmClackamas County 29 kmMultnomah County 51 kmYamhill County 62 kmWashington County 66 kmLinn County 68 kmPolk County 70 kmClark County 75 kmHood River County 84 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 1.9 (ml)
Depth
-1.1 km below the surface
Felt
no reports yet
Nearest
Marion County, 22 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2896 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 45.0965, -122.5575. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 22 km (14 mi) N of here earthquakes near Marion County
Clackamas County, OR 29 km (18 mi) WSW of here earthquakes near Clackamas County
Multnomah County, OR 51 km (32 mi) SSW of here earthquakes near Multnomah County
Yamhill County, OR 62 km (38 mi) ESE of here earthquakes near Yamhill County
Washington County, OR 66 km (41 mi) SE of here earthquakes near Washington County
Linn County, OR 68 km (42 mi) N of here earthquakes near Linn 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. 1.8 3 km N of Wilsonville, Oregon
  2. 1.6 6 km SE of Molalla, Oregon
  3. 1.7 3 km SSW of Scotts Mills, Oregon
  4. 1.9 4 km ENE of Lafayette, Oregon
  5. 1.5 0 km W of Garden Home-Whitford, Oregon
  6. 2.8 2 km W of Mehama, Oregon
  7. 1.8 8 km SE of Molalla, Oregon
  8. 1.9 8 km SE of Scotts Mills, Oregon
  9. 1.5 0 km N of Tigard, Oregon
  10. 1.7 4 km SSW of Scotts Mills, Oregon
  11. 1.5 6 km SSE of Molalla, Oregon
  12. 1.8 10 km N of Mill City, Oregon
  13. 1.7 3 km SW of Scotts Mills, Oregon
  14. 1.6 21 km ESE of Molalla, Oregon
  15. 2.0 7 km ESE of Molalla, 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.