QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

3 km ESE of Sherwood, Oregon

· -0.2 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 33 kmMultnomah County 37 kmYamhill County 42 kmClackamas County 51 kmMarion County 53 kmClark County 53 kmPolk County 69 kmColumbia County 70 kmTillamook County 76 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
no reports yet
Nearest
Washington County, 33 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1145 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 13 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 45.3488, -122.7943. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 33 km (20 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
Clackamas County, OR 51 km (32 mi) WNW of here earthquakes near Clackamas County
Marion County, OR 53 km (33 mi) NNW of here earthquakes near Marion County
Clark County, WA 53 km (33 mi) SSW of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.6 3 km NNE of Washougal, Washington
  2. 1.7 4 km ENE of Lafayette, Oregon
  3. 2.2 0 km SE of Barberton, Washington
  4. 2.0 4 km NNE of Lafayette, Oregon
  5. 1.7 11 km SE of Silverton, Oregon
  6. 1.6 3 km E of Sherwood, Oregon
  7. 1.9 7 km ESE of Molalla, Oregon
  8. 1.7 4 km ENE of Molalla, Oregon
  9. 1.8 5 km ENE of Molalla, Oregon
  10. 2.1 5 km ENE of Molalla, Oregon
  11. 2.0 2 km NE of Estacada, Oregon
  12. 1.6 8 km ESE of Molalla, Oregon
  13. 1.8 3 km WNW of Mulino, Oregon
  14. 1.6 4 km NE of Lafayette, Oregon
  15. 1.9 4 km ESE of Beavercreek, 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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