Earthquake near Longview, 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 10 km (6 mi) from the epicentre. In Longview, 37 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: Castle Rock.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
3. Around the size people start to feel M 3.0 180× the energy of this one
4. This earthquake M 1.5 about 5.4 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 · 29 km ESE of this epicentre May 18, 1980
2. 5.2 37 km NNE of Amboy, Washington · 28 km ESE of this epicentre Apr 14, 1980
3. 5.2 23 km S of Morton, Washington · 23 km ENE of this epicentre Feb 14, 1981
4. 5.1 28 km ENE of Amboy, Washington · 44 km SE of this epicentre Sep 17, 1961
5. 5.1 Washington · 29 km ESE 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 46.3062, -122.5302. Map © OpenStreetMap contributors.

Nearby places

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. 2.1 29 km E of Castle Rock, Washington 03:32 UTC
2. 1.6 21 km E of Castle Rock, Washington 22:56 UTC
3. 1.9 10 km SSE of Toledo, Washington 23:05 UTC
4. 1.7 20 km SE of Toledo, Washington 19:14 UTC
5. 1.7 1 km SSE of Prescott, Oregon 19:18 UTC
6. 1.6 7 km ENE of Prescott, Oregon 23:29 UTC
7. 2.3 14 km ENE of Yacolt, Washington 10:42 UTC
8. 1.7 3 km NW of West Longview, Washington 23:33 UTC
9. 1.9 23 km NE of Amboy, Washington 16:00 UTC
10. 2.2 37 km SSE of Morton, Washington 23:13 UTC
11. 1.6 4 km W of West Longview, Washington 23:19 UTC
12. 1.6 14 km SE of Mossyrock, Washington 18:57 UTC
13. 1.6 15 km ESE of Morton, Washington 21:41 UTC
14. 1.7 20 km N of Amboy, Washington 00:33 UTC
15. 1.5 28 km NNW of Amboy, Washington 14:39 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:45 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.