QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near South Hill, WA

No earthquake was likely felt in South Hill in the 24 hours to 9:09 am PST (17:09 UTC). The last one was M 4.2, 45 km (28 mi) NW, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near South Hill

This page: a magnitude 1.6 earthquake was recorded 34 km (21 mi) southeast of South Hill, WA, at 5:12 pm PST on 7 January 2021 (01:12 UTC), 6.5 km deep.

USGS: 15 km N of Ashford, Washington

84 km (52 mi) SSE of Seattle, WA · 48 km (30 mi) SSE of Auburn, WA

5:12 pm PST, Jan 7, 2021 · · 6.5 km deep · released about 8.7 lb of TNT

Every earthquake near South Hill Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 21 kmLewis County 46 kmThurston County 64 kmKing County 67 kmCowlitz County 94 kmKitsap County 96 kmSkamania County 97 kmMason County 102 kmKittitas 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
5:12 pm PST on 7 January 2021 ()
Where
34 km (21 mi) southeast of South Hill, WA · earthquakes near South Hill
Magnitude
M 1.6 (ml)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
Pierce County, 21 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2133 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. In South Hill, 34 km away, the estimate is intensity I (not felt). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Eatonville, Crocker, Orting, Graham, Prairie Ridge, Prairie Heights.

How big was it?

This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 6.7 4 km WNW of Roy, Washington · 48 km WNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 46.8998, -121.9930. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Pierce County, WA 21 km (13 mi) NW earthquakes near Pierce County
Lewis County, WA 46 km (29 mi) SW earthquakes near Lewis County
Thurston County, WA 64 km (40 mi) W earthquakes near Thurston County
King County, WA 67 km (41 mi) N earthquakes near King County
Cowlitz County, WA 94 km (58 mi) SW earthquakes near Cowlitz County
Kitsap County, WA 96 km (60 mi) NNW earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 2.3 6 km NE of Ashford, Washington
  2. 1.5 13 km W of Greenwater, Washington
  3. 1.9 14 km WSW of Alder, Washington
  4. 1.6 23 km ENE of Ashford, Washington
  5. 1.7 17 km NNE of Packwood, Washington
  6. 1.7 12 km W of Greenwater, Washington
  7. 1.5 10 km ESE of Enumclaw, Washington
  8. 1.6 6 km WSW of La Grande, Washington
  9. 1.5 11 km ESE of Enumclaw, Washington
  10. 2.0 5 km WNW of Packwood, Washington
  11. 1.7 7 km ESE of Ashford, Washington
  12. 1.6 7 km ESE of Ashford, Washington
  13. 2.3 14 km NNE of Ashford, Washington
  14. 1.8 14 km NNE of Ashford, Washington
  15. 1.5 1 km SSW of Ravensdale, 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.