QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

20 km SSW of Cascadia, 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 Linn County 29 kmLane County 42 kmBenton County 74 kmMarion County 75 kmPolk County 99 kmClackamas County 108 kmDeschutes County 113 kmDouglas County 115 kmLincoln County 116 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
Linn County, 29 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 568 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 44.2275, -122.5730. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Linn County, OR 29 km (18 mi) S of here earthquakes near Linn County
Lane County, OR 42 km (26 mi) NE of here earthquakes near Lane County
Benton County, OR 74 km (46 mi) ESE of here earthquakes near Benton County
Marion County, OR 75 km (47 mi) S of here earthquakes near Marion County
Polk County, OR 99 km (62 mi) SE of here earthquakes near Polk County
Clackamas County, OR 108 km (67 mi) SSW of here earthquakes near Clackamas 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. 0.4 24 km ENE of Unity, Oregon
  2. 1.8 1 km ESE of Springfield, Oregon
  3. 1.8 5 km NW of Lacomb, Oregon
  4. 1.6 5 km NW of Lacomb, Oregon
  5. 1.7 14 km NE of Springfield, Oregon
  6. 2.0 6 km W of Lacomb, Oregon
  7. 1.6 9 km SSE of Crawfordsville, Oregon
  8. 1.5 4 km SSE of Cascadia, Oregon
  9. 1.5 1 km NNE of Cascadia, Oregon
  10. 2.0 4 km N of Sweet Home, Oregon
  11. 1.8 5 km N of Waterloo, Oregon
  12. 1.6 4 km NW of Brownsville, Oregon
  13. 1.5 3 km S of Brownsville, Oregon
  14. 1.6 22 km N of Unity, Oregon
  15. 1.9 5 km ENE of Lebanon, 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.