QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

3 km NW of Mount Hood Village, Oregon

· -1.9 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clackamas County 28 kmHood River County 32 kmMultnomah County 37 kmClark County 57 kmMarion County 69 kmWasco County 70 kmSkamania County 72 kmWashington County 87 kmYamhill County 103 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
-1.9 km below the surface
Felt
no reports yet
Nearest
Clackamas County, 28 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1507 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 45.3758, -122.0125. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clackamas County, OR 28 km (17 mi) NNE of here earthquakes near Clackamas County
Hood River County, OR 32 km (20 mi) WSW of here earthquakes near Hood River County
Multnomah County, OR 37 km (23 mi) ESE of here earthquakes near Multnomah County
Clark County, WA 57 km (36 mi) SE of here earthquakes near Clark County
Marion County, OR 69 km (43 mi) NE of here earthquakes near Marion County
Wasco County, OR 70 km (44 mi) WNW of here earthquakes near Wasco County

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

Aftershocks so far

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

  1. 1.5 27 km NNE of Gates, Oregon
  2. 1.9 8 km NNE of Government Camp, Oregon
  3. 1.8 10 km ESE of Molalla, Oregon
  4. 1.6 3 km NNE of Washougal, Washington
  5. 1.6 5 km ENE of Government Camp, Oregon
  6. 1.6 7 km ENE of Government Camp, Oregon
  7. 1.9 7 km ESE of Molalla, Oregon
  8. 1.6 2 km E of Government Camp, Oregon
  9. 1.8 2 km E of Government Camp, Oregon
  10. 1.6 1 km E of Government Camp, Oregon
  11. 1.7 4 km ENE of Molalla, Oregon
  12. 1.8 5 km ENE of Molalla, Oregon
  13. 2.1 5 km ENE of Molalla, Oregon
  14. 2.0 2 km NE of Estacada, Oregon
  15. 1.6 8 km ESE of Molalla, 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.