QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km NW of King City, Oregon

· 18 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Washington County 26 kmMultnomah County 35 kmYamhill County 43 kmClark County 47 kmClackamas County 57 kmMarion County 61 kmColumbia County 62 kmPolk County 73 kmTillamook County 73 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
18 km below the surface
Felt
no reports yet
Nearest
Washington County, 26 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 543 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× 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 45.4168, -122.8252. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Washington County, OR 26 km (16 mi) SE of here earthquakes near Washington County
Multnomah County, OR 35 km (22 mi) WSW of here earthquakes near Multnomah County
Yamhill County, OR 43 km (27 mi) ENE of here earthquakes near Yamhill County
Clark County, WA 47 km (29 mi) SW of here earthquakes near Clark County
Clackamas County, OR 57 km (35 mi) WNW of here earthquakes near Clackamas County
Marion County, OR 61 km (38 mi) NNW of here earthquakes near Marion County

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

Aftershocks so far

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

  1. 1.5 3 km SSW of Scotts Mills, Oregon
  2. 1.8 7 km WNW of Warren, Oregon
  3. 1.7 6 km SSE of Molalla, Oregon
  4. 2.7 14 km ESE of Molalla, Oregon
  5. 2.0 8 km WNW of Warren, Oregon
  6. 1.6 7 km NE of Amity, Oregon
  7. 1.7 4 km NE of Lafayette, Oregon
  8. 1.7 2 km SSE of Sherwood, Oregon
  9. 1.6 5 km S of Aloha, Oregon
  10. 1.5 7 km WNW of Forest Grove, Oregon
  11. 1.7 9 km SE of Amity, Oregon
  12. 1.8 8 km ESE of Molalla, Oregon
  13. 1.8 3 km WSW of Felida, Washington
  14. 1.8 4 km E of Hubbard, Oregon
  15. 1.6 4 km WSW of Stafford, 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.