File:MSH80 eruption mount st helens 05-18-80.jpg

Descrizione

English: On May 18, 1980, at 8:32 a.m. Pacific Daylight Time, a magnitude 5.1 earthquake shook Mount St. Helens. The bulge and surrounding area slid away in a gigantic rockslide and debris avalanche, releasing pressure, and triggering a major pumice and ash eruption of the volcano. Thirteen-hundred feet (400 meters) of the peak collapsed or blew outwards. As a result, 24 square miles (62 square kilometers) of valley was filled by a debris avalanche, 250 square miles (650 square kilometers) of recreation, timber, and private lands were damaged by a lateral blast, and an estimated 200 million cubic yards (150 million cubic meters) of material was deposited directly by lahars (volcanic mudflows) into the river channels. Sixty-one people were killed or are still missing. USGS Photograph taken on May 18, 1980, by Austin Post.

Català: El 18 de maig, a les 8:32 a. m. Temps del Pacífic, un terratrèmol de una magnitud de 5,1 va fer trontollar la muntanya St. Helens. La protuberància l'àrea circumdant relliscà en una gegantina esllavissada de roques i un allau de rocam, alliberant la pressió, desencadenà una erupció de pedra tosca i cendra del volcà. 400 metres del puig van col·lapsar o van sortir volant. Com a resultat 62 quilometres quadrats de la vall van ser emplenats per la runa, 650 quilometres quadrats de llocs d'esbarjo, bosc, i finques privades van ser damnificades per una ràfega lateral, i una quantitat estimada en 150 milions de metres cúbics de material van ser dipositats per corrents de fang volcànic en els canals del riu. Cinquanta set persones van morir o han desaparegut (18 de Maig de 1980, Austin Post, USGS)

Español: Erupción del Monte Santa Helena

Français : Le 18 mai 1980, à 8h32 minutes (heure du Pacifique), un tremblement de terre de 5,1 sur l'échelle de Richter secoue le Mont Saint Helens, marquant le début de l'éruption du mont Saint Helens en 1980.

Data

18 maggio 1980

Fonte

Huge tif converted to jpeg and caption from USGS Mount St. Helens, Washington

May 18, 1980 Eruption Images

Autore

Austin Post (1922–2012)
Descrizione	fotografo, glaciologo e alpinista statunitense
Data di nascita/morte	16 marzo 1922	12 novembre 2012
Authority file	: Q4823234 VIAF: 74175677 ISNI: 0000000083944349 LCCN: n50019811 GND: 1081655585 SUDOC: 075535971 WorldCat

, USGS

Licenza
(Riusare questo file)

Quest'immagine è nel pubblico dominio perché contiene materiale proveniente dallo United States Geological Survey, un'agenzia del Dipartimento degli Interni degli Stati Uniti. Per maggiori informazioni vedere la politica ufficiale dell'USGS sul copyright.

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