Earthquake near Longbranch, WA

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Longbranch, 13 km away, the estimate is intensity II (weak). 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: Olympia, Lacey, Tanglewilde, Tanglewilde-Thompson Place, Shelton, Tumwater.

How big was it?

This earthquake released about 31 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 480,000× the energy of this one
2. Magna, Utah 2020 M 5.7 340,000× the energy of this one
3. Around the size people start to feel M 3.0 31× the energy of this one
4. This earthquake M 2.0 about 31 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

The largest earthquake within 50 km since 2016 was M 4.1 on 2017-02-23 — about 1,300 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

1. 6.8 The 2001 Nisqually, Washington Earthquake · 14 km E of this epicentre Feb 28, 2001
2. 6.7 4 km WNW of Roy, Washington · 29 km SE of this epicentre Apr 13, 1949
3. 6.7 1 km ENE of Dash Point, Washington · 42 km ENE of this epicentre Apr 29, 1965
4. 6.1 Puget Sound region, Washington · 30 km NNE of this epicentre Nov 13, 1939
5. 5.8 Puget Sound area, Washington · 14 km N of this epicentre Feb 15, 1946

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 47.1578, -122.9112. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.6 10 km WNW of Belfair, Washington 19:37 UTC
2. 1.7 4 km WNW of Vashon, Washington 04:29 UTC
3. 1.5 1 km NNW of Oakville, Washington 23:01 UTC
4. 1.9 10 km WNW of Allyn, Washington 15:17 UTC
5. 1.6 8 km WSW of Tumwater, Washington 01:22 UTC
6. 3.0 1 km NE of Gorst, Washington 01:29 UTC
7. 1.6 2 km E of Oakville, Washington 22:50 UTC
8. 3.1 Puget Sound region, Washington 02:41 UTC
9. 2.1 10 km WNW of Longbranch, Washington 23:42 UTC
10. 1.8 Olympic Peninsula, Washington 18:59 UTC
11. 1.5 Puget Sound region, Washington 01:33 UTC
12. 1.8 4 km S of Seabeck, Washington 03:09 UTC
13. 2.1 14 km N of Hoodsport, Washington 10:18 UTC
14. 1.7 2 km N of Oakville, Washington 19:51 UTC
15. 1.7 Puget Sound region, Washington 18:01 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:12 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

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