QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

2 km NE of Mirrormont, Washington

· 23 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 11 kmPierce County 49 kmKitsap County 54 kmSnohomish County 66 kmThurston County 88 kmMason County 91 kmIsland County 92 kmLewis County 104 kmKittitas County 105 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 1.7 (ml)
Depth
23 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
King County, 11 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 568 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 47.4752, -121.9738. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 11 km (7 mi) W of here earthquakes near King County
Pierce County, WA 49 km (30 mi) NNE of here earthquakes near Pierce County
Kitsap County, WA 54 km (33 mi) ESE of here earthquakes near Kitsap County
Snohomish County, WA 66 km (41 mi) SSW of here earthquakes near Snohomish County
Thurston County, WA 88 km (55 mi) NE of here earthquakes near Thurston County
Mason County, WA 91 km (57 mi) E of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.6 1 km ESE of Issaquah, Washington
  2. 1.5 1 km ENE of Bainbridge Island, Washington
  3. 1.5 11 km ESE of Enumclaw, Washington
  4. 1.9 2 km NNE of Esperance, Washington
  5. 2.3 0 km SSW of Boulevard Park, Washington
  6. 2.2 1 km NNE of Carnation, Washington
  7. 1.8 12 km W of Greenwater, Washington
  8. 1.5 1 km N of Boulevard Park, Washington
  9. 1.9 2 km SE of Ravensdale, Washington
  10. 1.7 1 km WNW of Bonney Lake, Washington
  11. 1.7 1 km NNE of Woods Creek, Washington
  12. 1.6 0 km N of Boulevard Park, Washington
  13. 2.8 0 km S of Boulevard Park, Washington
  14. 2.1 0 km SSW of Boulevard Park, Washington
  15. 2.2 2 km SSE of Carnation, 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 4.6 on 2019-07-12 — it released about 22,000 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.