QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

6 km ENE of Prescott, Oregon

· -0.3 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 18 kmColumbia County 25 kmClark County 42 kmWahkiakum County 53 kmWashington County 62 kmMultnomah County 66 kmLewis County 66 kmSkamania County 67 kmClatsop County 69 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 1.5 (ml)
Depth
-0.3 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 18 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 958 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 46.0705, -122.8147. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 18 km (11 mi) SW of here earthquakes near Cowlitz County
Columbia County, OR 25 km (16 mi) NE of here earthquakes near Columbia County
Clark County, WA 42 km (26 mi) NW of here earthquakes near Clark County
Wahkiakum County, WA 53 km (33 mi) ESE of here earthquakes near Wahkiakum County
Washington County, OR 62 km (38 mi) NNE of here earthquakes near Washington County
Multnomah County, OR 66 km (41 mi) NNW of here earthquakes near Multnomah County

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

Aftershocks so far

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

  1. 1.6 5 km NNE of Kalama, Washington
  2. 3.1 4 km WSW of Deer Island, Oregon
  3. 1.6 10 km SW of Vernonia, Oregon
  4. 1.6 10 km NW of West Longview, Washington
  5. 1.7 2 km WNW of Yacolt, Washington
  6. 1.8 2 km ENE of Brush Prairie, Washington
  7. 1.8 6 km NE of Woodland, Washington
  8. 1.5 13 km SSE of Vernonia, Oregon
  9. 1.7 5 km ENE of Prescott, Oregon
  10. 1.7 3 km W of Columbia City, Oregon
  11. 1.6 19 km SSW of Mossyrock, Washington
  12. 1.8 4 km NNW of West Longview, Washington
  13. 1.7 Washington-Oregon border region
  14. 1.6 31 km NNE of Amboy, Washington
  15. 2.0 3 km WSW of Yacolt, 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

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