QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

2 km W of Mehama, Oregon

· -0.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marion County 14 kmLinn County 35 kmClackamas County 55 kmPolk County 60 kmBenton County 69 kmYamhill County 73 kmMultnomah County 86 kmWashington County 91 kmLane County 98 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Marion County, 14 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1327 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 44.7918, -122.6567. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marion County, OR 14 km (9 mi) SSW of here earthquakes near Marion County
Linn County, OR 35 km (22 mi) NNW of here earthquakes near Linn County
Clackamas County, OR 55 km (34 mi) SW of here earthquakes near Clackamas County
Polk County, OR 60 km (37 mi) ESE of here earthquakes near Polk County
Benton County, OR 69 km (43 mi) ENE of here earthquakes near Benton County
Yamhill County, OR 73 km (45 mi) SE of here earthquakes near Yamhill 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. 1.8 5 km N of Waterloo, Oregon
  2. 1.7 5 km W of Mehama, Oregon
  3. 1.5 27 km NNE of Gates, Oregon
  4. 2.1 2 km WSW of Jefferson, Oregon
  5. 1.7 14 km N of Mehama, Oregon
  6. 1.9 5 km ENE of Lebanon, Oregon
  7. 1.7 9 km SSW of Saint Paul, Oregon
  8. 1.8 10 km ESE of Molalla, Oregon
  9. 1.7 5 km W of Mehama, Oregon
  10. 1.7 11 km SE of Silverton, Oregon
  11. 1.9 7 km ESE of Molalla, Oregon
  12. 1.7 4 km ENE of Molalla, Oregon
  13. 1.8 5 km ENE of Molalla, Oregon
  14. 2.1 5 km ENE of Molalla, Oregon
  15. 2.2 3 km NNW of Sweet Home, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2022-10-07 — it released about 8,500 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.