QuakeIndex

explosion · reviewed by a seismologist

M 1.5md

2 km SSE of Lewisville, Washington

· -0.9 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 3 kmMultnomah County 28 kmCowlitz County 47 kmColumbia County 47 kmSkamania County 50 kmWashington County 53 kmHood River County 73 kmClackamas County 74 kmYamhill 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 (md)
Depth
-0.9 km below the surface
Felt
no reports yet
Nearest
Clark County, 3 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1787 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 5.7 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 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 45.7928, -122.5075. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 3 km (2 mi) NW of here earthquakes near Clark County
Multnomah County, OR 28 km (17 mi) NNW of here earthquakes near Multnomah County
Cowlitz County, WA 47 km (29 mi) SSE of here earthquakes near Cowlitz County
Columbia County, OR 47 km (29 mi) ESE of here earthquakes near Columbia County
Skamania County, WA 50 km (31 mi) WSW of here earthquakes near Skamania County
Washington County, OR 53 km (33 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

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

  1. 1.5 3 km W of Yacolt, Washington
  2. 2.3 2 km SW of Lake Shore, Washington
  3. 2.7 11 km W of Deer Island, Oregon
  4. 1.7 1 km N of Deer Island, Oregon
  5. 2.5 3 km SW of Lake Shore, Washington
  6. 1.6 3 km SW of Lake Shore, Washington
  7. 1.5 6 km NW of North Portland, Oregon
  8. 1.9 12 km WNW of Scappoose, Oregon
  9. 1.6 Washington-Oregon border region
  10. 1.9 3 km W of Yacolt, Washington
  11. 1.7 1 km WSW of Yacolt, Washington
  12. 1.5 8 km N of Amboy, Washington
  13. 1.6 3 km WSW of Yacolt, Washington
  14. 1.6 3 km SW of Yacolt, Washington
  15. 1.7 3 km E of Prescott, 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.