QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

2 km WNW of Mehama, Oregon

· -0.3 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 13 kmLinn County 36 kmClackamas County 54 kmPolk County 60 kmBenton County 70 kmYamhill County 72 kmMultnomah County 85 kmWashington County 91 kmLane 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 1.9 (ml)
Depth
-0.3 km below the surface
Felt
no reports yet
Nearest
Marion County, 13 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2699 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 20 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 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 44.8000, -122.6475. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 13 km (8 mi) SSW of here earthquakes near Marion County
Linn County, OR 36 km (22 mi) NNW of here earthquakes near Linn County
Clackamas County, OR 54 km (33 mi) SW of here earthquakes near Clackamas County
Polk County, OR 60 km (37 mi) E of here earthquakes near Polk County
Benton County, OR 70 km (44 mi) ENE of here earthquakes near Benton County
Yamhill County, OR 72 km (45 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

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

  1. 1.9 5 km E of Scotts Mills, Oregon
  2. 1.9 4 km SSW of Scotts Mills, Oregon
  3. 1.9 16 km NNW of Cascadia, Oregon
  4. 1.7 14 km E of Lacomb, Oregon
  5. 2.0 4 km W of Mehama, Oregon
  6. 1.6 6 km W of Lacomb, Oregon
  7. 1.8 4 km N of Sweet Home, Oregon
  8. 1.9 1 km SSE of Sodaville, Oregon
  9. 1.6 5 km ENE of Lebanon, Oregon
  10. 1.7 5 km ESE of Scotts Mills, Oregon
  11. 1.5 4 km NNW of Sweet Home, Oregon
  12. 1.9 5 km ESE of Silverton, Oregon
  13. 2.0 7 km ESE of Molalla, Oregon
  14. 1.6 6 km SE of Molalla, Oregon
  15. 1.7 3 km SSW of Scotts Mills, 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

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