解説MSH80 eruption mount st helens 05-18-80.jpgEnglish: 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.Catala: El 18 de maig, a les 8:32 a. m. Temps del Pacific, un terratremol de una magnitud de 5,1 va fer trontollar la muntanya St. Helens. La protuberancia l'area circumdant rellisca en una gegantina esllavissada de roques i un allau de rocam, alliberant la pressio, desencadena una erupcio de pedra tosca i cendra del volca. 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 rafega lateral, i una quantitat estimada en 150 milions de metres cubics de material van ser dipositats per corrents de fang volcanic en els canals del riu. Cinquanta set persones van morir o han desaparegut (18 de Maig de 1980, Austin Post, USGS)Espanol: Erupcion del Monte Santa HelenaFrancais : Le 18 mai 1980, a 8h32 minutes (heure du Pacifique), un tremblement de terre de 5,1 sur l'echelle de Richter secoue le Mont Saint Helens
日付1980年5月18日

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作者.mw-parser-output .commons-creator-table{background-color:#f0f0ff;box-sizing:border-box;font-size:95%;text-align:start}.mw-parser-output .commons-creator-table>tbody>tr{vertical-align:top}.mw-parser-output .commons-creator-table>tbody>tr>th{background-color:#e0e0ee;font-weight:bold;text-align:start}@media(max-width:719px){.mw-parser-output .commons-creator-table,.mw-parser-output .commons-creator-table>tbody{display:block;width:100%}.mw-parser-output .commons-creator-table>tbody{border-right:1px solid #aaa;border-bottom:1px solid #aaa}.mw-parser-output .commons-creator-table>tbody>tr{border-top:1px solid #aaa;display:flex;flex-wrap:wrap}.mw-parser-output .commons-creator-table>tbody>tr>th{border-left:1px solid #aaa;padding:2px;flex:1 1 100%}.mw-parser-output .commons-creator-table>tbody>tr>td{border-left:1px solid #aaa;padding:2px;flex:1 1}}@media(min-width:720px){.mw-parser-output .commons-creator-table{border:1px solid #aaa;border-collapse:collapse;border-spacing:0;padding:5px}.mw-parser-output .commons-creator-table>tbody>tr>th,.mw-parser-output .commons-creator-table>tbody>tr>td{border:1px solid #aaa;padding:2px}.mw-parser-output .commons-creator-table>tbody>tr>.halfwidth{max-width:10em}.mw-parser-output .commons-creator-table>tbody>tr>.fullwidth{max-width:20em}}

Austin Post
説明米国の 写真家、雪氷学者および登山家

生年月日・没年月日1922年3月16日 
2012年11月12日 


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1980年のセント・ヘレンズ山噴火
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