QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

11 km W of Pendleton, Oregon

· -0.6 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Umatilla County 18 kmMorrow County 58 kmWalla Walla County 75 kmBenton County 78 kmUnion County 83 kmFranklin County 98 kmColumbia County 106 kmGilliam County 109 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
-0.6 km below the surface
Felt
no reports yet
Nearest
Umatilla County, 18 km ESE
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 7.1 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 45.6583, -118.9380. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Umatilla County, OR 18 km (11 mi) WNW of here earthquakes near Umatilla County
Morrow County, OR 58 km (36 mi) ENE of here earthquakes near Morrow County
Walla Walla County, WA 75 km (47 mi) SSW of here earthquakes near Walla Walla County
Benton County, WA 78 km (48 mi) SE of here earthquakes near Benton County
Union County, OR 83 km (52 mi) WNW of here earthquakes near Union County
Franklin County, WA 98 km (61 mi) S of here earthquakes near Franklin County

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

Aftershocks so far

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

  1. 1.8 3 km W of Pendleton, Oregon
  2. 1.7 12 km NE of Hermiston, Oregon
  3. 1.5 14 km NE of Hermiston, Oregon
  4. 1.8 4 km SSW of Wallula, Washington
  5. 1.7 4 km ESE of Umatilla, Oregon
  6. 1.7 12 km ENE of Hermiston, Oregon
  7. 2.0 10 km W of Pendleton, Oregon
  8. 2.0 4 km ESE of Umatilla, Oregon
  9. 1.9 4 km ESE of Umatilla, Oregon
  10. 2.3 7 km N of Helix, Oregon
  11. 1.7 8 km N of Helix, Oregon
  12. 1.9 9 km WNW of Touchet, Washington
  13. 1.8 4 km NNW of Pendleton, Oregon
  14. 2.0 3 km E of Umatilla, Oregon
  15. 1.6 4 km S of Echo, 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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