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Lava spine
A lava spine is a vertically growing monolith of viscous lava that is slowly forced from a volcanic vent, such as those growing on a lava dome (Bates & Jackson, 1987). It may also be considered a kind of dome called a spiny dome (Fink & Anderson, 2000). In February 1983, the dome activity of Mount St. Helens culminated in a spine that reached a height of about 100 ft before collapsing after two weeks, but another lava spine called the Whaleback never collapsed. A diatreme may also be referred to as a lava spine, such as the example of Mount Pelee in 1902. 〔(【引用サイトリンク】url=http://mountsthelens.com/history-3.html )〕 ==See also==
* Lava dome
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Lava spine」の詳細全文を読む
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