QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

10 km NNE of Sandy, Oregon

· 2.1 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Multnomah County 16 kmClark County 37 kmClackamas County 37 kmHood River County 45 kmSkamania County 63 kmWashington County 68 kmMarion County 71 kmColumbia County 83 kmCowlitz County 86 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 2.1 (ml)
Depth
2.1 km below the surface
Felt
no reports yet
Nearest
Multnomah County, 16 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 156 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 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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 45.4925, -122.2338. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Multnomah County, OR 16 km (10 mi) ESE of here earthquakes near Multnomah County
Clark County, WA 37 km (23 mi) SSE of here earthquakes near Clark County
Clackamas County, OR 37 km (23 mi) N of here earthquakes near Clackamas County
Hood River County, OR 45 km (28 mi) W of here earthquakes near Hood River County
Skamania County, WA 63 km (39 mi) SSW of here earthquakes near Skamania County
Washington County, OR 68 km (42 mi) E of here earthquakes near Washington County

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

Aftershocks so far

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

  1. 1.5 5 km NNW of Venersborg, Washington
  2. 1.6 5 km WSW of Yacolt, Washington
  3. 1.8 4 km WSW of Yacolt, Washington
  4. 2.1 8 km ESE of Molalla, Oregon
  5. 2.1 4 km W of Yacolt, Washington
  6. 1.6 2 km NE of Lewisville, Washington
  7. 2.1 4 km WSW of Yacolt, Washington
  8. 1.9 1 km SE of Vancouver, Washington
  9. 1.6 5 km SSW of Yacolt, Washington
  10. 1.6 7 km ESE of Molalla, Oregon
  11. 1.7 4 km NNW of Mount Hood Village, Oregon
  12. 1.5 2 km SSW of Yacolt, Washington
  13. 1.7 3 km NW of Venersborg, Washington
  14. 1.5 4 km WNW of Camas, Washington
  15. 1.6 4 km SSW of Amboy, 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.