QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

2 km ENE of Ridgefield, Washington

· 14 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 18 kmColumbia County 31 kmMultnomah County 38 kmCowlitz County 41 kmWashington County 43 kmSkamania County 63 kmWahkiakum County 76 kmYamhill County 80 kmClatsop County 80 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
14 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Clark County, 18 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 782 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 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 45.8268, -122.7098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 18 km (11 mi) WNW of here earthquakes near Clark County
Columbia County, OR 31 km (20 mi) ESE of here earthquakes near Columbia County
Multnomah County, OR 38 km (24 mi) NW of here earthquakes near Multnomah County
Cowlitz County, WA 41 km (26 mi) S of here earthquakes near Cowlitz County
Washington County, OR 43 km (27 mi) NE of here earthquakes near Washington County
Skamania County, WA 63 km (39 mi) WSW 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. 1.9 2 km WNW of Saint Helens, Oregon
  2. 1.6 5 km NNE of Venersborg, Washington
  3. 2.1 8 km S of Scappoose, Oregon
  4. 1.9 1 km ESE of North Portland, Oregon
  5. 1.6 8 km S of Scappoose, Oregon
  6. 1.6 13 km NE of Vernonia, Oregon
  7. 1.6 2 km NNE of Columbia City, Oregon
  8. 1.6 3 km W of Yacolt, Washington
  9. 1.7 18 km E of West Side Highway, Washington
  10. 1.6 19 km NE of Kalama, Washington
  11. 1.8 8 km SW of Scappoose, Oregon
  12. 2.2 2 km SSW of Banks, Oregon
  13. 1.6 21 km ENE of Kalama, Washington
  14. 1.9 1 km NNW of Battle Ground, Washington
  15. 1.5 27 km NNW 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.