QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

1 km ENE of Prescott, Oregon

· -0.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Columbia County 20 kmCowlitz County 22 kmClark County 43 kmWahkiakum County 50 kmWashington County 58 kmClatsop County 64 kmMultnomah County 66 kmLewis County 70 kmSkamania County 71 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Columbia County, 20 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 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 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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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 46.0522, -122.8725. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Columbia County, OR 20 km (13 mi) NE of here earthquakes near Columbia County
Cowlitz County, WA 22 km (14 mi) SW of here earthquakes near Cowlitz County
Clark County, WA 43 km (27 mi) NW of here earthquakes near Clark County
Wahkiakum County, WA 50 km (31 mi) ESE of here earthquakes near Wahkiakum County
Washington County, OR 58 km (36 mi) NNE of here earthquakes near Washington County
Clatsop County, OR 64 km (40 mi) E of here earthquakes near Clatsop County

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

Aftershocks so far

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

  1. 1.7 3 km E of Prescott, Oregon
  2. 1.6 3 km WSW of Yacolt, Washington
  3. 1.5 9 km SSE of Toledo, Washington
  4. 1.8 8 km S of Scappoose, Oregon
  5. 1.8 3 km WNW of Saint Helens, Oregon
  6. 1.8 9 km NE of Castle Rock, Washington
  7. 1.7 4 km WSW of Yacolt, Washington
  8. 2.4 Washington
  9. 1.8 11 km SSE of Toledo, Washington
  10. 1.5 6 km ENE of Prescott, Oregon
  11. 1.7 7 km ENE of Prescott, Oregon
  12. 1.6 3 km E of Battle Ground, Washington
  13. 1.7 3 km NNE of La Center, Washington
  14. 2.0 19 km N of Amboy, Washington
  15. 1.7 10 km NE of Castle Rock, 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.