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Mount St. Helens Blows Out Its North Face · Chronopin

DesastrePublicado 21/09/202621/09/2026 a las 20:57·@ScienceDesk A la línea de tiempo

Mount St. Helens Blows Out Its North Face

Mount St. Helens Blows Out Its North Face

Mount St. Helens Blows Out Its North Face

Empieza el 18/05/1980 15:32

Mount St. Helens, Skamania County, Washington, United States

Etiquetas

Cascade Range
Largest Landslide on Record
Lateral Blast
Mount St. Helens
Washington

Comentarios

88% DE CONFIANZA

The moment is recorded to the second: "An earthquake at 8:32:11 am PDT (UTC-7) on May 18, 1980, caused the entire weakened north face to slide away", which is 15:32:11 UTC.^[1]

Inicio: 18 may 198090% DE CONFIANZAsegún la fuente

Mount St. Helens Blows Out Its North Face

An earthquake at 8:32 a.m. local time dropped the volcano's weakened north face away in the largest subaerial landslide on record, uncorking a lateral blast toward Spirit Lake. Fifty-seven people were killed.

The 18 May 1980 eruption rated VEI 5 and was the first in the contiguous United States since the much smaller 1915 eruption of Lassen Peak. [1]
An earthquake at 8:32:11 a.m. PDT dropped the whole weakened north face away — the largest subaerial landslide in recorded history — releasing gas-rich magma as a lateral blast toward Spirit Lake. [1]
The eruption column rose 80,000 feet and deposited ash in 11 US states and several Canadian provinces; melting snow, ice and glaciers formed lahars that reached the Columbia River nearly 50 miles away. [1]
About 57 people were killed, including volcanologist David A. Johnston and innkeeper Harry R. Truman, and damage exceeded $1 billion. [1]
The thermal energy released equalled 26 megatons of TNT. [1]

0

Referencias 388% DE CONFIANZA

La primera entrada es siempre la fuente del pin. La confianza global es una media ponderada de la firmeza con la que cada referencia respalda las horas de inicio y fin usadas arriba; una referencia cuenta la mitad por cada 180 días que sea más antigua que la más reciente.

[1]90%
usgs.gov/volcanoes/mount-st-helens
usgs.gov· Publicado el 21 sept 2026· Empieza 18 may 1980 ✓· 33% de la puntuación
The moment is recorded to the second: "An earthquake at 8:32:11 am PDT (UTC-7) on May 18, 1980, caused the entire weakened north face to slide away", which is 15:32:11 UTC.
[2]85%
1980 eruption of Mount St. Helens - Wikipedia
en.wikipedia.org· Añadido el 21 sept 2026· 33% de la puntuación
Carries the origin time to the second, the landslide and lateral-blast sequence, the ash distribution, the death toll and the damage figure quoted here.^[1]
[3]90%
Global Volcanism Program | St. Helens
volcano.si.edu· Añadido el 21 sept 2026· 33% de la puntuación
The Smithsonian's eruption database for St. Helens, the authority for the volcano's identity and eruptive record.^[1]

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