QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

5 km NW of Mount Hood Village, Oregon

· -1.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clackamas County 29 kmHood River County 32 kmMultnomah County 35 kmClark County 55 kmMarion County 70 kmSkamania County 71 kmWasco County 72 kmWashington County 86 kmYamhill County 102 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
-1.7 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Clackamas County, 29 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2392 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 45.3910, -122.0250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clackamas County, OR 29 km (18 mi) NNE of here earthquakes near Clackamas County
Hood River County, OR 32 km (20 mi) WSW of here earthquakes near Hood River County
Multnomah County, OR 35 km (22 mi) ESE of here earthquakes near Multnomah County
Clark County, WA 55 km (34 mi) SE of here earthquakes near Clark County
Marion County, OR 70 km (43 mi) NE of here earthquakes near Marion County
Skamania County, WA 71 km (44 mi) S of here earthquakes near Skamania 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 6 km SE of Molalla, Oregon
  2. 2.0 6 km NE of Government Camp, Oregon
  3. 1.9 5 km ENE of Government Camp, Oregon
  4. 1.6 5 km NE of Government Camp, Oregon
  5. 1.7 6 km NE of Government Camp, Oregon
  6. 1.7 4 km N of Mount Hood, Oregon
  7. 1.8 8 km SE of Molalla, Oregon
  8. 1.6 6 km NE of Government Camp, Oregon
  9. 1.7 5 km NE of Government Camp, Oregon
  10. 1.8 6 km NE of Government Camp, Oregon
  11. 1.9 5 km NE of Government Camp, Oregon
  12. 1.5 6 km NE of Government Camp, Oregon
  13. 1.6 6 km NE of Government Camp, Oregon
  14. 2.2 6 km NE of Government Camp, Oregon
  15. 2.0 6 km NE of Government Camp, 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

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