QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km SSE of Stafford, Oregon

· 18 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Multnomah County 33 kmWashington County 40 kmClackamas County 43 kmMarion County 48 kmYamhill County 49 kmClark County 53 kmPolk County 72 kmColumbia County 75 kmHood River County 84 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
18 km below the surface
Felt
no reports yet
Nearest
Multnomah County, 33 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 236 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 45.3222, -122.6972. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Multnomah County, OR 33 km (21 mi) SW of here earthquakes near Multnomah County
Washington County, OR 40 km (25 mi) SE of here earthquakes near Washington County
Clackamas County, OR 43 km (27 mi) WNW of here earthquakes near Clackamas County
Marion County, OR 48 km (30 mi) NNW of here earthquakes near Marion County
Yamhill County, OR 49 km (31 mi) E of here earthquakes near Yamhill County
Clark County, WA 53 km (33 mi) SSW of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.2 13 km SE of Scotts Mills, Oregon
  2. 2.0 10 km SSE of Scappoose, Oregon
  3. 2.1 8 km ESE of Molalla, Oregon
  4. 1.6 5 km SSE of Molalla, Oregon
  5. 2.0 2 km SE of Amity, Oregon
  6. 1.9 1 km SE of Vancouver, Washington
  7. 1.5 9 km ESE of Scotts Mills, Oregon
  8. 1.6 7 km ESE of Molalla, Oregon
  9. 1.5 5 km WNW of King City, Oregon
  10. 1.7 7 km ESE of Amity, Oregon
  11. 1.5 4 km WNW of Camas, Washington
  12. 2.0 2 km WNW of Dundee, Oregon
  13. 2.1 10 km NNE of Sandy, Oregon
  14. 1.7 8 km S of Molalla, Oregon
  15. 1.9 7 km S of Dayton, 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.