QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

2 km ENE of Brush Prairie, Washington

· 4.3 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 4 kmMultnomah County 23 kmColumbia County 49 kmWashington County 50 kmCowlitz County 52 kmSkamania County 54 kmClackamas County 69 kmHood River County 72 kmYamhill County 83 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
4.3 km below the surface
Felt
no reports yet
Nearest
Clark County, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 295 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 45.7382, -122.5182. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 4 km (3 mi) SW of here earthquakes near Clark County
Multnomah County, OR 23 km (14 mi) NNW of here earthquakes near Multnomah County
Columbia County, OR 49 km (31 mi) ESE of here earthquakes near Columbia County
Washington County, OR 50 km (31 mi) ENE of here earthquakes near Washington County
Cowlitz County, WA 52 km (33 mi) SSE of here earthquakes near Cowlitz County
Skamania County, WA 54 km (34 mi) SW of here earthquakes near Skamania County

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

Aftershocks so far

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

  1. 1.5 27 km NNW of Amboy, Washington
  2. 1.9 5 km WSW of Yacolt, Washington
  3. 1.8 5 km N of West Haven, Oregon
  4. 1.6 10 km WSW of Felida, Washington
  5. 1.6 12 km NNE of Amboy, Washington
  6. 1.5 4 km SSW of Aloha, Oregon
  7. 1.5 2 km WSW of Stafford, Oregon
  8. 2.0 5 km NW of North Portland, Oregon
  9. 1.6 3 km NNE of Washougal, Washington
  10. 1.6 5 km ENE of Prescott, Oregon
  11. 1.5 14 km NE of Amboy, Washington
  12. 2.2 0 km SE of Barberton, Washington
  13. 1.5 24 km N of Amboy, Washington
  14. 1.6 1 km WSW of Kalama, Washington
  15. 1.7 24 km N 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.