QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

3 km SSE of Issaquah, Washington

· 6.8 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 14 kmKitsap County 50 kmPierce County 51 kmSnohomish County 65 kmThurston County 87 kmIsland County 88 kmMason County 88 kmLewis County 106 kmKittitas County 110 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 2.1 (ml)
Depth
6.8 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
King County, 14 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 610 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 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 47.4978, -122.0220. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 14 km (9 mi) W of here earthquakes near King County
Kitsap County, WA 50 km (31 mi) ESE of here earthquakes near Kitsap County
Pierce County, WA 51 km (31 mi) N of here earthquakes near Pierce County
Snohomish County, WA 65 km (40 mi) SSW of here earthquakes near Snohomish County
Thurston County, WA 87 km (54 mi) NE of here earthquakes near Thurston County
Island County, WA 88 km (55 mi) SSE of here earthquakes near Island County

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

Aftershocks so far

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

  1. 1.9 7 km S of Woods Creek, Washington
  2. 1.7 2 km NE of Echo Lake, Washington
  3. 1.7 3 km NNE of Dash Point, Washington
  4. 2.8 4 km N of Echo Lake, Washington
  5. 1.6 1 km NNW of Boulevard Park, Washington
  6. 2.1 0 km NNW of Esperance, Washington
  7. 1.8 1 km NNW of Maple Valley, Washington
  8. 1.6 1 km SW of Burien, Washington
  9. 1.8 8 km ESE of Carbonado, Washington
  10. 1.8 8 km NE of Fall City, Washington
  11. 2.4 10 km NNE of Snoqualmie, Washington
  12. 1.7 9 km ENE of Snoqualmie, Washington
  13. 1.5 4 km ESE of Indianola, Washington
  14. 1.7 13 km W of Greenwater, Washington
  15. 2.4 2 km N of City of Sammamish, 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 4,700 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.