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Mount Griggs, formerly known as Knife Peak Volcano, is a stratovolcano, which lies 10 km behind the volcanic arc defined by other Katmai group volcanoes. Although no historic eruptions have been reported from Mount Griggs, vigorously active fumaroles persist in a summit crater and along the upper southwest flank. The fumaroles on the southwest flank are the hottest, and some of the flank fumaroles can roar so loudly that they can be heard from the valley floor.〔 The slopes of Mount Griggs are heavily mantled by fallout from the 1912 eruption of Novarupta volcano.〔(【引用サイトリンク】title=Volcanoes of the Alaska Peninsula and Aleutian Islands-Selected Photographs - Album )〕 The mountain was named for Dr. Robert Fiske Griggs (1881–1962), botanist, whose explorations of the area, after the eruption of Mount Katmai in 1912, led to the creation of Katmai National Monument by President Woodrow Wilson in 1918. ==See also== * List of volcanoes in the United States of America * Mountain peaks of Alaska * Mountain peaks of North America * Mountain peaks of the United States * List of Ultras of North America * List of Ultras of the United States 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「Mount Griggs」の詳細全文を読む スポンサード リンク
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