QuakeIndex

explosion · reviewed by a seismologist

M 2.1ml

8 km SE of Molalla, Oregon

· -0.6 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 23 kmClackamas County 24 kmMultnomah County 50 kmYamhill County 67 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 2.1 (ml)
Depth
-0.6 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Marion County, 23 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2879 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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, -122.4940. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 23 km (14 mi) NNE of here earthquakes near Marion County
Clackamas County, OR 24 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 67 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. 1.9 4 km SSW of Scotts Mills, Oregon
  2. 2.0 4 km W of Mehama, Oregon
  3. 1.7 5 km ESE of Scotts Mills, Oregon
  4. 1.9 5 km ESE of Silverton, Oregon
  5. 2.0 7 km ESE of Molalla, Oregon
  6. 1.8 3 km N of Wilsonville, Oregon
  7. 1.6 6 km SE of Molalla, Oregon
  8. 1.7 3 km SSW of Scotts Mills, Oregon
  9. 1.5 0 km W of Garden Home-Whitford, Oregon
  10. 2.8 2 km W of Mehama, Oregon
  11. 1.8 8 km SE of Molalla, Oregon
  12. 1.9 8 km SE of Scotts Mills, Oregon
  13. 1.5 0 km N of Tigard, Oregon
  14. 1.7 4 km SSW of Scotts Mills, Oregon
  15. 1.5 6 km SSE 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.