QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km NE of Woodland, Washington

· 15 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 26 kmCowlitz County 27 kmColumbia County 30 kmMultnomah County 50 kmWashington County 55 kmSkamania County 57 kmWahkiakum County 68 kmLewis County 74 kmClatsop 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
15 km below the surface
Felt
no reports yet
Nearest
Clark County, 26 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1083 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 45.9528, -122.6895. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 26 km (16 mi) NW of here earthquakes near Clark County
Cowlitz County, WA 27 km (17 mi) S of here earthquakes near Cowlitz County
Columbia County, OR 30 km (19 mi) E of here earthquakes near Columbia County
Multnomah County, OR 50 km (31 mi) NNW of here earthquakes near Multnomah County
Washington County, OR 55 km (34 mi) NE of here earthquakes near Washington County
Skamania County, WA 57 km (36 mi) W of here earthquakes near Skamania 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. 2.0 30 km N of Amboy, Washington
  2. 1.6 1 km WSW of Kalama, Washington
  3. 1.7 24 km N of Amboy, Washington
  4. 2.1 24 km N of Amboy, Washington
  5. 1.7 4 km NNE of Kalama, Washington
  6. 1.8 5 km WNW of Deer Island, Oregon
  7. 1.8 21 km SE of Toledo, Washington
  8. 2.3 19 km E of Kelso, Washington
  9. 2.0 19 km E of Kelso, Washington
  10. 1.5 9 km ENE of Kalama, Washington
  11. 2.1 12 km E of Yacolt, Washington
  12. 2.0 19 km SE of Toledo, Washington
  13. 1.6 3 km NNE of West Haven, Oregon
  14. 1.6 1 km E of Lewisville, Washington
  15. 1.8 7 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.