QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

4 km S of Fort Hill, Oregon

· -0.4 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Polk County 18 kmYamhill County 31 kmLincoln County 51 kmTillamook County 51 kmBenton County 59 kmWashington County 69 kmMarion County 78 kmLinn County 100 kmMultnomah County 106 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
-0.4 km below the surface
Felt
no reports yet
Nearest
Polk County, 18 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 790 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 10 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 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 45.0193, -123.5527. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Polk County, OR 18 km (11 mi) NW of here earthquakes near Polk County
Yamhill County, OR 31 km (20 mi) SW of here earthquakes near Yamhill County
Lincoln County, OR 51 km (31 mi) NE of here earthquakes near Lincoln County
Tillamook County, OR 51 km (32 mi) SSE of here earthquakes near Tillamook County
Benton County, OR 59 km (37 mi) N of here earthquakes near Benton County
Washington County, OR 69 km (43 mi) SSW of here earthquakes near Washington County

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

Aftershocks so far

53 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. 2.1 4 km NE of Lafayette, Oregon
  11. 1.5 2 km NW of Sheridan, Oregon
  12. 1.6 24 km NNW of Sheridan, Oregon
  13. 1.8 8 km W of Falls City, Oregon
  14. 1.7 2 km E of Amity, Oregon
  15. 3.2 5 km SE of Amity, 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.