QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

10 km SW of Vernonia, Oregon

· -0.4 km deep · released about 7.8 lb of TNT

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10 km30 km60 km120 km N Columbia County 23 kmWashington County 32 kmClatsop County 40 kmTillamook County 53 kmWahkiakum County 56 kmYamhill County 62 kmClark County 63 kmCowlitz County 65 kmMultnomah County 74 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 1.6 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Columbia County, 23 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 983 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 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 45.8017, -123.2935. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Columbia County, OR 23 km (14 mi) SW of here earthquakes near Columbia County
Washington County, OR 32 km (20 mi) NNW of here earthquakes near Washington County
Clatsop County, OR 40 km (25 mi) SE of here earthquakes near Clatsop County
Tillamook County, OR 53 km (33 mi) NE of here earthquakes near Tillamook County
Wahkiakum County, WA 56 km (35 mi) S of here earthquakes near Wahkiakum County
Yamhill County, OR 62 km (38 mi) N of here earthquakes near Yamhill 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. 1.8 3 km E of Kalama, Washington
  2. 1.5 3 km WSW of Kalama, Washington
  3. 1.5 11 km ENE of East Cathlamet, Washington
  4. 1.9 21 km W of Forest Grove, Oregon
  5. 1.6 4 km NNE of Kalama, Washington
  6. 1.6 15 km ESE of Wheeler, Oregon
  7. 1.6 6 km NNW of Clatskanie, Oregon
  8. 1.6 9 km E of Wheeler, Oregon
  9. 1.9 2 km WNW of Saint Helens, Oregon
  10. 1.6 3 km E of East Cathlamet, Washington
  11. 2.1 8 km S of Scappoose, Oregon
  12. 1.7 8 km SW of Vernonia, Oregon
  13. 1.6 8 km S of Scappoose, Oregon
  14. 1.6 13 km NE of Vernonia, Oregon
  15. 1.6 13 km E of Wheeler, Oregon

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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