QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

9 km NW of Keizer, Oregon

· -0.2 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yamhill County 27 kmPolk County 28 kmMarion County 45 kmWashington County 56 kmBenton County 67 kmTillamook County 68 kmClackamas County 73 kmLinn County 77 kmMultnomah County 77 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
-0.2 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Yamhill County, 27 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 845 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 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 45.0515, -123.1088. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yamhill County, OR 27 km (17 mi) SE of here earthquakes near Yamhill County
Polk County, OR 28 km (18 mi) NE of here earthquakes near Polk County
Marion County, OR 45 km (28 mi) WNW of here earthquakes near Marion County
Washington County, OR 56 km (35 mi) S of here earthquakes near Washington County
Benton County, OR 67 km (42 mi) NNE of here earthquakes near Benton County
Tillamook County, OR 68 km (42 mi) SE of here earthquakes near Tillamook County

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

Aftershocks so far

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

  1. 2.0 2 km WNW of Dundee, Oregon
  2. 1.7 8 km S of Molalla, Oregon
  3. 1.9 7 km S of Dayton, Oregon
  4. 1.6 2 km WSW of Stafford, Oregon
  5. 1.6 4 km NE of Falls City, Oregon
  6. 1.8 4 km SSE of Stafford, Oregon
  7. 2.1 4 km NE of Lafayette, Oregon
  8. 1.5 2 km NW of Sheridan, Oregon
  9. 1.6 24 km NNW of Sheridan, Oregon
  10. 1.8 8 km W of Falls City, Oregon
  11. 1.7 2 km E of Amity, Oregon
  12. 3.2 5 km SE of Amity, Oregon
  13. 1.6 6 km S of Dayton, Oregon
  14. 1.9 4 km NE of Lafayette, Oregon
  15. 1.6 5 km W of Dallas, 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.