QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

7 km NNW of Pe Ell, Washington

· -0.3 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pacific County 36 kmWahkiakum County 38 kmThurston County 51 kmGrays Harbor County 65 kmCowlitz County 70 kmLewis County 73 kmClatsop County 73 kmColumbia County 79 kmMason County 81 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Pacific County, 36 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 131 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 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 46.6327, -123.3310. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pacific County, WA 36 km (22 mi) ENE of here earthquakes near Pacific County
Wahkiakum County, WA 38 km (24 mi) N of here earthquakes near Wahkiakum County
Thurston County, WA 51 km (32 mi) SW of here earthquakes near Thurston County
Grays Harbor County, WA 65 km (41 mi) SE of here earthquakes near Grays Harbor County
Cowlitz County, WA 70 km (43 mi) NW of here earthquakes near Cowlitz County
Lewis County, WA 73 km (45 mi) W of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 1.0 6 km SE of McCleary, Washington
  2. 1.6 6 km NE of Rochester, Washington
  3. 1.5 11 km ENE of East Cathlamet, Washington
  4. 1.5 6 km NW of Winlock, Washington
  5. 1.7 1 km E of Oakville, Washington
  6. 2.0 3 km NNE of Winlock, Washington
  7. 1.7 14 km S of Cosmopolis, Washington
  8. 1.8 4 km NW of Winlock, 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

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