QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

8 km E of Molalla, Oregon

· -0.5 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clackamas County 22 kmMarion County 28 kmMultnomah County 46 kmWashington County 67 kmYamhill County 67 kmClark County 70 kmLinn County 72 kmHood River County 76 kmPolk County 78 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 1.7 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Clackamas County, 22 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1433 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.7 about 9 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 45.1388, -122.4708. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clackamas County, OR 22 km (14 mi) W of here earthquakes near Clackamas County
Marion County, OR 28 km (17 mi) NNE of here earthquakes near Marion County
Multnomah County, OR 46 km (28 mi) S of here earthquakes near Multnomah County
Washington County, OR 67 km (42 mi) SE of here earthquakes near Washington County
Yamhill County, OR 67 km (42 mi) E of here earthquakes near Yamhill County
Clark County, WA 70 km (44 mi) S of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.9 7 km ESE of Molalla, Oregon
  2. 1.7 4 km ENE of Molalla, Oregon
  3. 1.8 5 km ENE of Molalla, Oregon
  4. 2.1 5 km ENE of Molalla, Oregon
  5. 2.0 2 km NE of Estacada, Oregon
  6. 1.6 8 km ESE of Molalla, Oregon
  7. 1.8 3 km WNW of Mulino, Oregon
  8. 1.9 4 km ESE of Beavercreek, Oregon
  9. 1.5 3 km SSW of Scotts Mills, Oregon
  10. 1.7 6 km SSE of Molalla, Oregon
  11. 2.7 14 km ESE of Molalla, Oregon
  12. 2.1 14 km SSE of Scotts Mills, Oregon
  13. 1.7 2 km SSE of Sherwood, Oregon
  14. 1.6 5 km S of Aloha, Oregon
  15. 1.8 8 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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