QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

3 km S of Fort Hill, Oregon

· -0.5 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Polk County 19 kmYamhill County 31 kmTillamook County 50 kmLincoln County 51 kmBenton County 60 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 1.6 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Polk County, 19 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 420 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 45.0267, -123.5550. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Polk County, OR 19 km (12 mi) NW of here earthquakes near Polk County
Yamhill County, OR 31 km (19 mi) SW of here earthquakes near Yamhill County
Tillamook County, OR 50 km (31 mi) SSE of here earthquakes near Tillamook County
Lincoln County, OR 51 km (32 mi) NNE of here earthquakes near Lincoln County
Benton County, OR 60 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

24 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. 2.0 2 km WNW of Dundee, Oregon
  8. 1.8 4 km ENE of Lincoln Beach, Oregon
  9. 1.9 7 km S of Dayton, Oregon
  10. 1.6 4 km NE of Falls City, Oregon
  11. 2.1 4 km NE of Lafayette, Oregon
  12. 1.5 2 km NW of Sheridan, Oregon
  13. 1.6 24 km NNW of Sheridan, Oregon
  14. 1.8 8 km W of Falls City, Oregon
  15. 1.7 2 km E 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

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