QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

2 km E of Sherwood, Oregon

· -0.2 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 31 kmMultnomah County 37 kmYamhill County 42 kmClark County 52 kmClackamas County 53 kmMarion County 54 kmColumbia County 68 kmPolk County 69 kmTillamook County 75 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Washington County, 31 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2237 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 7.1 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 45.3595, -122.8080. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 31 km (19 mi) SE of here earthquakes near Washington County
Multnomah County, OR 37 km (23 mi) SW of here earthquakes near Multnomah County
Yamhill County, OR 42 km (26 mi) ENE of here earthquakes near Yamhill County
Clark County, WA 52 km (32 mi) SSW of here earthquakes near Clark County
Clackamas County, OR 53 km (33 mi) WNW of here earthquakes near Clackamas County
Marion County, OR 54 km (34 mi) NNW of here earthquakes near Marion County

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

Aftershocks so far

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

  1. 1.7 4 km ESE of Silverton, Oregon
  2. 1.9 3 km NNE of Hubbard, Oregon
  3. 1.7 Washington-Oregon border region
  4. 1.7 5 km SSW of Saint Paul, Oregon
  5. 1.7 8 km E of Molalla, Oregon
  6. 1.6 8 km SW of Aloha, Oregon
  7. 1.6 5 km E of Hubbard, Oregon
  8. 1.5 6 km SE of Molalla, Oregon
  9. 1.8 3 km W of Saint Paul, Oregon
  10. 1.6 14 km ESE of Scotts Mills, Oregon
  11. 1.7 8 km SE of Amity, Oregon
  12. 2.0 4 km WNW of Dundee, Oregon
  13. 2.8 6 km SW of Aloha, Oregon
  14. 1.6 1 km SSE of King City, Oregon
  15. 2.0 4 km SE of Mill Plain, Washington

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.