QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

1 km NE of Lewisville, Washington

· -1.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 6 kmMultnomah County 31 kmCowlitz County 44 kmColumbia County 46 kmSkamania County 49 kmWashington County 54 kmHood River County 75 kmClackamas County 78 kmLewis County 85 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
-1.1 km below the surface
Felt
no reports yet
Nearest
Clark County, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 554 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 45.8217, -122.5110. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 6 km (4 mi) NNW of here earthquakes near Clark County
Multnomah County, OR 31 km (19 mi) NNW of here earthquakes near Multnomah County
Cowlitz County, WA 44 km (27 mi) SSE of here earthquakes near Cowlitz County
Columbia County, OR 46 km (29 mi) ESE of here earthquakes near Columbia County
Skamania County, WA 49 km (30 mi) WSW of here earthquakes near Skamania County
Washington County, OR 54 km (34 mi) ENE of here earthquakes near Washington 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. 1.6 3 km WSW of Yacolt, Washington
  2. 1.6 5 km SW of Deer Island, Oregon
  3. 1.5 3 km SW of Yacolt, Washington
  4. 1.7 6 km ENE of Prescott, Oregon
  5. 1.7 13 km ESE of Yacolt, Washington
  6. 1.5 3 km SSW of Beaverton, Oregon
  7. 2.2 3 km ESE of Woodland, Washington
  8. 1.6 16 km ENE of Kalama, Washington
  9. 1.8 0 km SW of Kalama, Washington
  10. 1.6 1 km SSW of Cherry Grove, Washington
  11. 1.5 4 km NW of North Portland, Oregon
  12. 1.8 24 km N of Amboy, Washington
  13. 1.5 Washington-Oregon border region
  14. 1.8 12 km NNW of Amboy, Washington
  15. 1.7 11 km WNW of Warren, 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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