QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km S of Scappoose, Oregon

· 23 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 21 kmColumbia County 33 kmClark County 34 kmMultnomah County 40 kmYamhill County 58 kmCowlitz County 60 kmTillamook County 72 kmClatsop County 73 kmClackamas 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
23 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Washington County, 21 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 760 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 45.6778, -122.8972. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 21 km (13 mi) NE of here earthquakes near Washington County
Columbia County, OR 33 km (20 mi) SSE of here earthquakes near Columbia County
Clark County, WA 34 km (21 mi) WSW of here earthquakes near Clark County
Multnomah County, OR 40 km (25 mi) WNW of here earthquakes near Multnomah County
Yamhill County, OR 58 km (36 mi) NE of here earthquakes near Yamhill County
Cowlitz County, WA 60 km (37 mi) SSW of here earthquakes near Cowlitz County

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

Aftershocks so far

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

  1. 1.5 3 km ESE of La Center, Washington
  2. 1.5 8 km W of Yamhill, Oregon
  3. 1.6 3 km SE of Sherwood, Oregon
  4. 1.6 11 km NE of Vernonia, Oregon
  5. 1.9 3 km WNW of Tigard, Oregon
  6. 2.4 3 km W of Yacolt, Washington
  7. 1.9 5 km SSW of Aloha, Oregon
  8. 1.6 5 km WSW of Yacolt, Washington
  9. 1.6 3 km WSW of Stafford, Oregon
  10. 1.6 5 km NE of Lewisville, Washington
  11. 1.8 8 km S of Scappoose, Oregon
  12. 1.6 5 km ENE of Lewisville, Washington
  13. 1.9 3 km NNE of Deer Island, Oregon
  14. 1.9 1 km ESE of La Center, Washington
  15. 1.6 5 km NNE of Kalama, Washington

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.