QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

7 km WSW of Amanda Park, Washington

· -0.2 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grays Harbor County 37 kmJefferson County 55 kmMason County 62 kmClallam County 77 kmPacific County 98 kmThurston County 103 kmKitsap County 103 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 1.5 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
Grays Harbor County, 37 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1560 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 47.4255, -123.9862. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grays Harbor County, WA 37 km (23 mi) NNW of here earthquakes near Grays Harbor County
Jefferson County, WA 55 km (34 mi) SW of here earthquakes near Jefferson County
Mason County, WA 62 km (38 mi) W of here earthquakes near Mason County
Clallam County, WA 77 km (48 mi) S of here earthquakes near Clallam County
Pacific County, WA 98 km (61 mi) N of here earthquakes near Pacific County
Thurston County, WA 103 km (64 mi) WNW of here earthquakes near Thurston County

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

Aftershocks so far

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

  1. 1.7 12 km NNW of Humptulips, Washington
  2. 2.2 12 km ENE of Humptulips, Washington
  3. 1.6 5 km WNW of Humptulips, Washington
  4. 1.5 2 km ESE of Humptulips, Washington
  5. 1.6 9 km NE of Humptulips, Washington
  6. 1.7 12 km NE of Santiago, Washington
  7. 1.6 19 km E of Humptulips, Washington
  8. 2.0 9 km NE of Santiago, Washington
  9. 1.5 12 km NNW of Amanda Park, Washington
  10. 1.6 15 km NNE of Amanda Park, Washington
  11. 1.6 0 km S of Pacific Beach, Washington
  12. 1.9 8 km NW of Aberdeen Gardens, Washington
  13. 1.7 11 km S of Humptulips, Washington
  14. 2.0 9 km SSW of Humptulips, Washington
  15. 2.0 8 km WSW of Neilton, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2018-11-19 — it released about 6,700 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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