QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km NNW of Mill Plain, Washington

· 17 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 11 kmMultnomah County 15 kmWashington County 48 kmColumbia County 54 kmSkamania County 58 kmCowlitz County 60 kmClackamas County 62 kmHood River County 69 kmYamhill County 79 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 1.8 (ml)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Clark County, 11 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2602 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 45.6707, -122.5102. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 11 km (7 mi) S of here earthquakes near Clark County
Multnomah County, OR 15 km (10 mi) NNW of here earthquakes near Multnomah County
Washington County, OR 48 km (30 mi) ENE of here earthquakes near Washington County
Columbia County, OR 54 km (33 mi) SE of here earthquakes near Columbia County
Skamania County, WA 58 km (36 mi) SW of here earthquakes near Skamania County
Cowlitz County, WA 60 km (37 mi) SSE of here earthquakes near Cowlitz 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. 1.7 3 km NNE of Deer Island, Oregon
  2. 1.8 3 km N of Wilsonville, Oregon
  3. 1.8 4 km SW of North Portland, Oregon
  4. 1.5 0 km W of Garden Home-Whitford, Oregon
  5. 1.5 5 km ENE of Lewisville, Washington
  6. 1.5 0 km N of Tigard, Oregon
  7. 1.8 2 km S of Saint Helens, Oregon
  8. 1.6 5 km E of Lewisville, Washington
  9. 1.7 1 km SSE of Prescott, Oregon
  10. 2.3 14 km ENE of Yacolt, Washington
  11. 1.5 3 km E of Lewisville, Washington
  12. 1.9 23 km NE of Amboy, Washington
  13. 1.7 20 km N of Amboy, Washington
  14. 2.9 Washington-Oregon border region
  15. 1.8 2 km SW of Tualatin, 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.