QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

7 km NW of Newberg, Oregon

· -0.4 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 23 kmYamhill County 26 kmMultnomah County 52 kmTillamook County 58 kmPolk County 58 kmMarion County 62 kmClark County 62 kmColumbia County 65 kmClackamas 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 1.8 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Washington County, 23 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1140 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 45.3563, -123.0267. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 23 km (14 mi) SSE of here earthquakes near Washington County
Yamhill County, OR 26 km (16 mi) ENE of here earthquakes near Yamhill County
Multnomah County, OR 52 km (32 mi) WSW of here earthquakes near Multnomah County
Tillamook County, OR 58 km (36 mi) E of here earthquakes near Tillamook County
Polk County, OR 58 km (36 mi) NNE of here earthquakes near Polk County
Marion County, OR 62 km (38 mi) NW of here earthquakes near Marion County

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

Aftershocks so far

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

  1. 1.8 5 km ENE of Molalla, Oregon
  2. 2.1 5 km ENE of Molalla, Oregon
  3. 1.8 3 km WNW of Mulino, Oregon
  4. 1.6 4 km NE of Lafayette, Oregon
  5. 1.6 17 km WNW of Banks, Oregon
  6. 1.9 4 km ESE of Beavercreek, Oregon
  7. 1.6 3 km NNE of West Haven, Oregon
  8. 1.5 3 km SSW of Scotts Mills, Oregon
  9. 1.7 6 km SSE of Molalla, Oregon
  10. 1.5 5 km ENE of Sheridan, Oregon
  11. 1.6 7 km NE of Amity, Oregon
  12. 1.7 4 km NE of Lafayette, Oregon
  13. 1.7 2 km SSE of Sherwood, Oregon
  14. 1.6 5 km S of Aloha, Oregon
  15. 1.5 7 km WNW of Forest Grove, 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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