20th-Century Volcanic Events: Surtsey, 1980 Eruption of Mount St. Helens, Armero Tragedy, Nevado del Ruiz, Mount Pinatubo, Mount Pel E, Eldfell Source Wikipedia

ISBN: 9781233122554

Published: August 19th 2011

Paperback

40 pages


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20th-Century Volcanic Events: Surtsey, 1980 Eruption of Mount St. Helens, Armero Tragedy, Nevado del Ruiz, Mount Pinatubo, Mount Pel E, Eldfell  by  Source Wikipedia

20th-Century Volcanic Events: Surtsey, 1980 Eruption of Mount St. Helens, Armero Tragedy, Nevado del Ruiz, Mount Pinatubo, Mount Pel E, Eldfell by Source Wikipedia
August 19th 2011 | Paperback | PDF, EPUB, FB2, DjVu, talking book, mp3, ZIP | 40 pages | ISBN: 9781233122554 | 4.76 Mb

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 38. Chapters: Surtsey, 1980 eruption of Mount St. Helens, Armero tragedy, Nevado del Ruiz, Mount Pinatubo, Mount Pel e, Eldfell, Santa Mar a, Novarupta, 1955 Hawaiian submarine eruption.

Excerpt: The 1980 eruption of Mount St. Helens, a stratovolcano located in Washington state, in the United States, was a major volcanic eruption. The eruption (which was a VEI 5 event) was the only significant one to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on Mount St.

Helens north slope. USGS scientists convinced the authorities to close Mount St. Helens to the general public and to maintain the closure in spite of pressure to re-open it- their work saved thousands of lives. An earthquake at 8:32:17 a.m. PDT (UTC?7) on Sunday, May 18, 1980, caused the entire weakened north face to slide away, suddenly exposing the partly molten, gas- and steam-rich rock in the volcano to lower pressure. The rock responded by exploding a hot mix of lava and pulverized older rock toward Spirit Lake so fast that it overtook the avalanching north face.

An eruption column rose 80,000 feet (24,400 m) into the atmosphere and deposited ash in 11 U.S. states. At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly fifty miles (eighty kilometers) to the southwest.

Less severe outbursts continued into the next day only to be followed by other large but not as destructive eruptions later in 1980. Fifty-seven people (including innkeeper Harry R. Truman, photographer Reid Blackburn and geologist...



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