QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mwr

17 km NNW of Sekiu, Washington

· 38 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clallam County 50 kmJefferson County 93 kmSan Juan County 95 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 3.7 (mwr)
Depth
38 km below the surface
Felt
155 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Clallam County, 50 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 328 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 155 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× more

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 48.4093, -124.3874. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clallam County, WA 50 km (31 mi) NW of here earthquakes near Clallam County
Jefferson County, WA 93 km (58 mi) NW of here earthquakes near Jefferson County
San Juan County, WA 95 km (59 mi) W of here earthquakes near San Juan County
Mason County, WA 148 km (92 mi) NW of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 0.6 12 km SSE of Neah Bay, Washington
  2. 0.7 12 km SSE of Neah Bay, Washington
  3. 1.6 39 km NNW of Neah Bay, Washington
  4. 1.5 19 km NNW of Forks, Washington
  5. 2.3 33 km NNW of Neah Bay, Washington
  6. 1.6 12 km SW of Neah Bay, Washington
  7. 1.6 7 km WNW of Neah Bay, Washington
  8. 1.8 10 km N of Neah Bay, Washington
  9. 1.6 33 km NNW of Neah Bay, Washington
  10. 1.8 10 km WNW of Neah Bay, 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.