QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

Washington-Oregon border region

· -1.1 km deep · released about 7.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 3 kmMultnomah County 29 kmCowlitz County 46 kmColumbia County 48 kmSkamania County 48 kmWashington County 55 kmHood River County 72 kmClackamas County 75 kmLewis 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 1.6 (ml)
Depth
-1.1 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Clark County, 3 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1805 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 7.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.3 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 45.8027, -122.4900. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 3 km (2 mi) N of here earthquakes near Clark County
Multnomah County, OR 29 km (18 mi) N of here earthquakes near Multnomah County
Cowlitz County, WA 46 km (29 mi) SSE of here earthquakes near Cowlitz County
Columbia County, OR 48 km (30 mi) ESE of here earthquakes near Columbia County
Skamania County, WA 48 km (30 mi) WSW of here earthquakes near Skamania County
Washington County, OR 55 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

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

  1. 1.7 1 km N of Deer Island, Oregon
  2. 2.5 3 km SW of Lake Shore, Washington
  3. 1.6 3 km SW of Lake Shore, Washington
  4. 1.5 6 km NW of North Portland, Oregon
  5. 1.9 12 km WNW of Scappoose, Oregon
  6. 1.6 Washington-Oregon border region
  7. 1.9 3 km W of Yacolt, Washington
  8. 1.7 1 km WSW of Yacolt, Washington
  9. 1.5 8 km N of Amboy, Washington
  10. 1.6 3 km WSW of Yacolt, Washington
  11. 1.6 3 km SW of Yacolt, Washington
  12. 1.7 3 km E of Prescott, Oregon
  13. 1.6 3 km WSW of Yacolt, Washington
  14. 1.8 8 km S of Scappoose, Oregon
  15. 1.8 3 km WNW of Saint Helens, 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.