QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

6 km SSW of Falls City, Oregon

· -0.5 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Polk County 12 kmBenton County 36 kmLincoln County 39 kmYamhill County 50 kmMarion County 72 kmTillamook County 75 kmLinn County 83 kmWashington County 88 kmClackamas County 108 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 1.9 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Polk County, 12 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 549 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 44.8125, -123.4770. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Polk County, OR 12 km (7 mi) SSW of here earthquakes near Polk County
Benton County, OR 36 km (22 mi) N of here earthquakes near Benton County
Lincoln County, OR 39 km (24 mi) ENE of here earthquakes near Lincoln County
Yamhill County, OR 50 km (31 mi) SSW of here earthquakes near Yamhill County
Marion County, OR 72 km (45 mi) W of here earthquakes near Marion County
Tillamook County, OR 75 km (47 mi) SSE of here earthquakes near Tillamook County

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

Aftershocks so far

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

  1. 1.8 2 km ENE of Blodgett, Oregon
  2. 2.0 2 km SE of Amity, Oregon
  3. 1.9 3 km S of Fort Hill, Oregon
  4. 2.6 3 km SE of Rose Lodge, Oregon
  5. 2.0 7 km WNW of McMinnville, Oregon
  6. 1.7 7 km ESE of Amity, Oregon
  7. 1.8 4 km ENE of Lincoln Beach, Oregon
  8. 1.9 7 km S of Dayton, Oregon
  9. 1.6 4 km NE of Falls City, Oregon
  10. 1.9 7 km SE of Toledo, Oregon
  11. 1.5 2 km NW of Sheridan, Oregon
  12. 1.8 8 km W of Falls City, Oregon
  13. 1.7 2 km E of Amity, Oregon
  14. 3.2 5 km SE of Amity, Oregon
  15. 1.6 6 km S of Dayton, 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.