QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

4 km N of Sweet Home, Oregon

· -0.5 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Linn County 16 kmMarion County 53 kmBenton County 55 kmLane County 58 kmPolk County 74 kmClackamas County 91 kmLincoln County 96 kmYamhill County 101 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
-0.5 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Linn County, 16 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1452 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 44.4393, -122.7313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Linn County, OR 16 km (10 mi) WSW of here earthquakes near Linn County
Marion County, OR 53 km (33 mi) SSW of here earthquakes near Marion County
Benton County, OR 55 km (34 mi) E of here earthquakes near Benton County
Lane County, OR 58 km (36 mi) NNE of here earthquakes near Lane County
Polk County, OR 74 km (46 mi) SE of here earthquakes near Polk County
Clackamas County, OR 91 km (56 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

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

  1. 1.5 1 km NNE of Cascadia, Oregon
  2. 2.0 4 km N of Sweet Home, Oregon
  3. 1.8 5 km N of Waterloo, Oregon
  4. 1.6 4 km NW of Brownsville, Oregon
  5. 1.7 5 km W of Mehama, Oregon
  6. 1.5 3 km S of Brownsville, Oregon
  7. 1.6 22 km N of Unity, Oregon
  8. 2.1 2 km WSW of Jefferson, Oregon
  9. 1.9 5 km ENE of Lebanon, Oregon
  10. 1.7 5 km W of Mehama, Oregon
  11. 2.2 3 km NNW of Sweet Home, Oregon
  12. 1.6 2 km SSE of Sodaville, Oregon
  13. 1.7 29 km SE of Cascadia, Oregon
  14. 1.6 6 km SSE of Monroe, Oregon
  15. 1.7 9 km SSW of Holley, 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.