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Pump Geyser
Pump Geyser is a cone geyser located in the Upper Geyser Basin of Yellowstone National Park. It is in the Geyser Hill Complex which includes Aurum Geyser, Beehive Geyser, Big Cub Geyser. Doublet Pool, Giantess Geyser and Lion Geyser, among others.〔(【引用サイトリンク】publisher=Geyser Observation and Study Association )〕
Pump Geyser erupts almost constantly making splashes 2 to 3 feet high, and thumps without an apparent interval, though there are less productive periods. Then, in 1990, Pump became a true geyser, with intervals and durations of a few seconds. A small boil builds up to a heavy doming of the water which triggers bursting eruptions that spray water up to 15 feet high. After a few seconds of this, the activity dies down to a mere simmer, but, after a pause of a few seconds, the cycle starts anew.〔(【引用サイトリンク】publisher=YellowstoneNationalPark.com )〕
It was most likely named by Frank Jay Haynes, the park photographer from 1883 to 1916. It gets its name because its constant eruptions make a sound similar to that of old style mechanical pump.
Pump Geyser could have a connection with Sponge Geyser, but it has not been proven. When Sponge fill up, Pump is strangely quiet. Then, when Sponge drains, after a few seconds, Pump begins spurting again. Although a connection is very likely, it has not been further studied.
==References==
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「Pump Geyser」の詳細全文を読む
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