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Excelsior Geyser
Excelsior Geyser Crater, formerly known as Excelsior Geyser, is a hot spring in the Midway Geyser Basin of Yellowstone National Park in the United States. Excelsior was named by the Hayden Geological Survey of 1871. Possibly the only known photograph of Excelsior in full eruption was taken by Frank Jay Haynes in 1888.
The Excelsior Geyser pool discharges 4,000 to 4,500 gallons (15,100–17,000 l)〔(【引用サイトリンク】url=http://geyserstudy.org/geyser.aspx?pGeyserNo=EXCELSIOR )〕 of 〔(【引用サイトリンク】title=Thermal Springs List for the United States )〕 water per minute directly into the Firehole River. In the late 19th century (there was possibly some activity in 1901 too), it was an active geyser that erupted frequently. Most eruptions were about 100 feet high, although some exceeded in both height and width. It is believed that the powerful eruptions damaged its internal plumbing system, and it now boils as a productive hot spring most of the time.
In 1985, Excelsior returned to activity for a 46 hour period from September 14 to 16. These eruptions were relatively small at but a few were as much as tall and 100 feet wide. All of these eruptions lasted about 2 minutes at intervals of 5 to 66 minutes.〔
In the mid first decade of the 21st century Excelsior did have violent boiling strong enough to be considered as eruptions, the boiling reached between and had a duration of seconds.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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