QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

8 km ESE of Molalla, Oregon

· -0.4 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clackamas County 24 kmMarion County 24 kmMultnomah County 49 kmYamhill County 67 kmWashington County 69 kmLinn County 69 kmClark County 74 kmPolk County 75 kmHood River County 79 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
Clackamas County, 24 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 827 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 45.1090, -122.4890. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clackamas County, OR 24 km (15 mi) WSW of here earthquakes near Clackamas County
Marion County, OR 24 km (15 mi) NNE of here earthquakes near Marion County
Multnomah County, OR 49 km (31 mi) S of here earthquakes near Multnomah County
Yamhill County, OR 67 km (41 mi) ESE of here earthquakes near Yamhill County
Washington County, OR 69 km (43 mi) SE of here earthquakes near Washington County
Linn County, OR 69 km (43 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

49 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 4 km NNW of Mount Hood Village, Oregon
  7. 1.5 5 km WNW of King City, Oregon
  8. 2.1 10 km NNE of Sandy, Oregon
  9. 1.7 8 km S of Molalla, Oregon
  10. 1.6 2 km WSW of Stafford, Oregon
  11. 1.8 4 km SSE of Stafford, Oregon
  12. 1.7 8 km S of Molalla, Oregon
  13. 1.8 7 km SSE of Molalla, Oregon
  14. 1.6 6 km ESE of Molalla, Oregon
  15. 1.6 4 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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