QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

3 km NNE of Washougal, Washington

· -1.4 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Multnomah County 9 kmClark County 21 kmClackamas County 51 kmHood River County 54 kmSkamania County 55 kmWashington County 59 kmColumbia County 68 kmCowlitz County 70 kmMarion County 81 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
-1.4 km below the surface
Felt
no reports yet
Nearest
Multnomah County, 9 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 522 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 6.4 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 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 45.6102, -122.3412. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Multnomah County, OR 9 km (6 mi) NE of here earthquakes near Multnomah County
Clark County, WA 21 km (13 mi) SSE of here earthquakes near Clark County
Clackamas County, OR 51 km (32 mi) NNW of here earthquakes near Clackamas County
Hood River County, OR 54 km (34 mi) WNW of here earthquakes near Hood River County
Skamania County, WA 55 km (34 mi) SSW of here earthquakes near Skamania County
Washington County, OR 59 km (37 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

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

  1. 1.5 5 km NNW of Venersborg, Washington
  2. 2.2 27 km ENE of Yacolt, Washington
  3. 2.0 10 km SSE of Scappoose, Oregon
  4. 1.6 5 km WSW of Yacolt, Washington
  5. 1.8 4 km WSW of Yacolt, Washington
  6. 2.1 4 km W of Yacolt, Washington
  7. 1.6 2 km NE of Lewisville, Washington
  8. 2.6 18 km NE of Amboy, Washington
  9. 2.1 4 km WSW of Yacolt, Washington
  10. 1.9 1 km SE of Vancouver, Washington
  11. 1.6 5 km SSW of Yacolt, Washington
  12. 1.7 4 km NNW of Mount Hood Village, Oregon
  13. 1.5 2 km SSW of Yacolt, Washington
  14. 1.5 5 km WNW of King City, Oregon
  15. 1.7 3 km NW 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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