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

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Description

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. Fifty-seven 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 el 18 de mayo de 1980.

Date

18 May 1980

Source

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

May 18, 1980 Eruption Images

Author

Austin Post (1922–2012)
Description	American photographer, glaciologist and mountaineer
Date of birth/death	16 March 1922	12 November 2012
Authority file	: Q4823234 VIAF: 74175677 ISNI: 0000000083944349 LCCN: n50019811 GND: 1081655585 SUDOC: 075535971 WorldCat

, scanned photograph by USGS, cleaned by and adjusted by carol

Permission
(Reusing this file)

This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: this version has been cleaned, the colors have been adjusted for what was probably bluish developing film and color shifted from age..

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