QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

11 km NNE of Sandy, Oregon

· -1.2 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Multnomah County 19 kmClackamas County 37 kmClark County 39 kmHood River County 41 kmSkamania County 62 kmWashington County 72 kmMarion County 72 kmColumbia County 86 kmWasco County 87 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 1.5 (ml)
Depth
-1.2 km below the surface
Felt
no reports yet
Nearest
Multnomah County, 19 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2701 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 45.4887, -122.1820. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Multnomah County, OR 19 km (12 mi) ESE of here earthquakes near Multnomah County
Clackamas County, OR 37 km (23 mi) N of here earthquakes near Clackamas County
Clark County, WA 39 km (24 mi) SE of here earthquakes near Clark County
Hood River County, OR 41 km (26 mi) W of here earthquakes near Hood River County
Skamania County, WA 62 km (39 mi) SSW of here earthquakes near Skamania County
Washington County, OR 72 km (45 mi) E of here earthquakes near Washington 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 8 km E of Government Camp, Oregon
  2. 1.6 7 km ENE of Government Camp, Oregon
  3. 1.7 13 km ESE of Yacolt, Washington
  4. 1.8 20 km NNW of Carson, Washington
  5. 1.6 3 km NW of Mount Hood Village, Oregon
  6. 1.9 5 km ENE of Government Camp, Oregon
  7. 1.6 5 km ENE of Government Camp, Oregon
  8. 1.6 1 km SSW of Cherry Grove, Washington
  9. 1.8 5 km NW of Mount Hood Village, Oregon
  10. 1.5 4 km W of Mulino, Oregon
  11. 1.7 8 km SE of Molalla, Oregon
  12. 1.6 4 km SSW of Sandy, Oregon
  13. 1.5 8 km NE of Government Camp, Oregon
  14. 2.4 7 km NE of Government Camp, Oregon
  15. 1.5 2 km NNW of Venersborg, 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

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