QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

2 km NNW of Summerville, Oregon

· -1.1 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Union County 23 kmUmatilla County 57 kmWallowa County 65 kmColumbia County 88 kmWalla Walla County 91 kmBaker County 93 kmAsotin County 97 kmGarfield 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 1.8 (ml)
Depth
-1.1 km below the surface
Felt
no reports yet
Nearest
Union County, 23 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2348 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 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 45.5065, -118.0170. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Union County, OR 23 km (14 mi) N of here earthquakes near Union County
Umatilla County, OR 57 km (35 mi) E of here earthquakes near Umatilla County
Wallowa County, OR 65 km (41 mi) W of here earthquakes near Wallowa County
Columbia County, WA 88 km (55 mi) S of here earthquakes near Columbia County
Walla Walla County, WA 91 km (56 mi) SSE of here earthquakes near Walla Walla County
Baker County, OR 93 km (58 mi) NNW of here earthquakes near Baker County

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

Aftershocks so far

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

  1. 1.5 3 km SSE of Wallowa, Oregon
  2. 1.7 11 km E of Milton-Freewater, Oregon
  3. 1.5 22 km NNE of Elgin, Oregon
  4. 1.6 19 km SE of Walla Walla East, Washington
  5. 1.6 13 km SW of Lostine, Oregon
  6. 1.6 6 km WSW of La Grande, Oregon
  7. 1.8 10 km SE of La Grande, Oregon
  8. 1.6 21 km ESE of Cove, Oregon
  9. 1.8 5 km SSE of Milton-Freewater, Oregon
  10. 2.1 19 km SSW of La Grande, Oregon
  11. 2.7 6 km NNW of Summerville, Oregon
  12. 2.0 15 km WSW of Lostine, Oregon
  13. 2.1 15 km E of Weston, Oregon
  14. 1.6 14 km NE of Cove, Oregon
  15. 2.1 17 km WSW of Lostine, 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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