Earthquake near West Side Highway, WA

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 12 km (7 mi) from the epicentre. In West Side Highway, 19 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: Kelso, Castle Rock, Longview, Longview Heights, Rainier, Kalama.

USGS catalogues this as explosion, not an earthquake.

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.

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 16 earthquakes of M5 or more within 50 km; the five largest:

1. 5.7 38 km NNE of Amboy, Washington · 37 km E of this epicentre May 18, 1980
2. 5.2 37 km NNE of Amboy, Washington · 37 km E of this epicentre Apr 14, 1980
3. 5.2 23 km S of Morton, Washington · 38 km ENE of this epicentre Feb 14, 1981
4. 5.1 28 km ENE of Amboy, Washington · 47 km ESE of this epicentre Sep 17, 1961
5. 5.1 Washington · 39 km E of this epicentre Apr 3, 1980

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 46.1925, -122.6735. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.7 20 km E of Castle Rock, Washington 12:14 UTC
2. 1.7 6 km W of Mossyrock, Washington 19:30 UTC
3. 3.8 20 km E of Castle Rock, Washington 11:09 UTC
4. 1.6 32 km N of Amboy, Washington 03:57 UTC
5. 1.8 4 km WSW of Yacolt, Washington 22:55 UTC
6. 1.8 27 km N of Amboy, Washington 07:41 UTC
7. 2.1 4 km W of Yacolt, Washington 23:42 UTC
8. 1.8 3 km E of Kalama, Washington 19:13 UTC
9. 2.3 37 km NNE of Amboy, Washington 16:44 UTC
10. 1.5 3 km WSW of Kalama, Washington 19:29 UTC
11. 1.6 2 km NE of Lewisville, Washington 22:32 UTC
12. 2.6 18 km NE of Amboy, Washington 18:14 UTC
13. 1.5 37 km NNE of Amboy, Washington 20:21 UTC
14. 1.6 20 km E of Castle Rock, Washington 11:04 UTC
15. 1.6 38 km NE of Amboy, Washington 01:25 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:06 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.