QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

1 km NNW of Walnut Grove, Washington

· 16 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 14 kmMultnomah County 21 kmWashington County 41 kmColumbia County 47 kmCowlitz County 58 kmSkamania County 63 kmClackamas County 66 kmYamhill County 73 kmHood River County 76 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
16 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Clark County, 14 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 565 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.

How big was it?

This earthquake released about 7.1 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 7.1 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 45.6805, -122.6048. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 14 km (9 mi) SW of here earthquakes near Clark County
Multnomah County, OR 21 km (13 mi) NW of here earthquakes near Multnomah County
Washington County, OR 41 km (25 mi) ENE of here earthquakes near Washington County
Columbia County, OR 47 km (29 mi) SE of here earthquakes near Columbia County
Cowlitz County, WA 58 km (36 mi) S of here earthquakes near Cowlitz County
Skamania County, WA 63 km (39 mi) SW of here earthquakes near Skamania County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.0 1 km NNW of Salmon Creek, Washington
  2. 1.6 Washington-Oregon border region
  3. 1.7 12 km NE of Vernonia, Oregon
  4. 1.5 13 km ENE of Vernonia, Oregon
  5. 1.7 3 km SSW of Yacolt, Washington
  6. 1.7 3 km NNE of Deer Island, Oregon
  7. 1.8 3 km N of Wilsonville, Oregon
  8. 1.8 1 km ENE of Prescott, Oregon
  9. 1.8 4 km SW of North Portland, Oregon
  10. 1.5 0 km W of Garden Home-Whitford, Oregon
  11. 1.5 5 km ENE of Lewisville, Washington
  12. 1.5 0 km N of Tigard, Oregon
  13. 1.8 2 km S of Saint Helens, Oregon
  14. 1.6 5 km E of Lewisville, Washington
  15. 1.7 1 km SSE 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.