QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

27 km NNE of Gates, Oregon

· -0.8 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clackamas County 21 kmMarion County 24 kmLinn County 59 kmMultnomah County 63 kmHood River County 77 kmYamhill County 84 kmPolk County 87 kmClark County 88 kmWashington County 88 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 1.5 (ml)
Depth
-0.8 km below the surface
Felt
no reports yet
Nearest
Clackamas County, 21 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 458 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 44.9908, -122.3057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clackamas County, OR 21 km (13 mi) SSW of here earthquakes near Clackamas County
Marion County, OR 24 km (15 mi) ENE of here earthquakes near Marion County
Linn County, OR 59 km (36 mi) NNE of here earthquakes near Linn County
Multnomah County, OR 63 km (39 mi) S of here earthquakes near Multnomah County
Hood River County, OR 77 km (48 mi) SW of here earthquakes near Hood River County
Yamhill County, OR 84 km (52 mi) ESE of here earthquakes near Yamhill County

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

Aftershocks so far

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

  1. 1.2 13 km SE of Scotts Mills, Oregon
  2. 2.1 8 km ESE of Molalla, Oregon
  3. 1.6 5 km SSE of Molalla, Oregon
  4. 1.5 9 km ESE of Scotts Mills, Oregon
  5. 1.6 7 km ESE of Molalla, Oregon
  6. 1.7 8 km S of Molalla, Oregon
  7. 1.8 4 km SSE of Stafford, Oregon
  8. 1.7 8 km S of Molalla, Oregon
  9. 1.8 7 km SSE of Molalla, Oregon
  10. 1.6 6 km ESE of Molalla, Oregon
  11. 1.6 4 km SSW of Scotts Mills, Oregon
  12. 1.8 6 km ESE of Molalla, Oregon
  13. 1.8 3 km W of Mehama, Oregon
  14. 1.5 5 km E of Beavercreek, Oregon
  15. 2.1 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

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