QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

4 km NNW of Pendleton, Oregon

· -0.6 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Umatilla County 14 kmWalla Walla County 66 kmMorrow County 69 kmUnion County 78 kmBenton County 79 kmFranklin County 92 kmColumbia County 95 kmGilliam County 119 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
-0.6 km below the surface
Felt
1 report
Nearest
Umatilla County, 14 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 368 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 13 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 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 45.7085, -118.8147. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Umatilla County, OR 14 km (9 mi) NNW of here earthquakes near Umatilla County
Walla Walla County, WA 66 km (41 mi) SSW of here earthquakes near Walla Walla County
Morrow County, OR 69 km (43 mi) ENE of here earthquakes near Morrow County
Union County, OR 78 km (48 mi) NW of here earthquakes near Union County
Benton County, WA 79 km (49 mi) SE of here earthquakes near Benton County
Franklin County, WA 92 km (57 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

13 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. 2.1 5 km S of Milton-Freewater, Oregon
  7. 1.7 12 km ENE of Hermiston, Oregon
  8. 2.0 10 km W of Pendleton, Oregon
  9. 2.0 4 km ESE of Umatilla, Oregon
  10. 1.9 4 km ESE of Umatilla, Oregon
  11. 2.3 7 km N of Helix, Oregon
  12. 1.7 8 km N of Helix, Oregon
  13. 1.9 9 km WNW of Touchet, Washington

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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