Fountain Geyser (2017) : 無料・フリー素材/写真
Fountain Geyser (2017) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in northwestern Wyoming, USA.Fountain Geyser is a large, regularly-erupting feature in the Fountain Group of Yellowstone’s Lower Geyser Basin. It has a moderately large, irregularly polygonal surface vent that is 6 to 12 meters across. The vent is surrounded by a geyserite platform with moderately developed concentric ridges at its eastern edge. Eruption starts are preceded by a relatively rapid rise in water level. Eruptions occur every ~4 to 6 hours and last for about 30 minutes. Some eruptive bursts reach up to ~80 feet high. Much of the erupted water volume moves northward into Morning Geyser’s basin, which overflows and then heads north into a large field of weathered geyserite gravel. Bursting patterns show that Fountain Geyser erupts from two major subaqueous vents.In 1998, researchers measured Fountain Geyser’s water temperature at 83.4º Celsius (= 182º Fahrenheit), with a pH of about 8.5 (slightly alkaline).Logger data from fall 2018 show Fountain Geyser intervals (= eruption start to eruption start) ranged from 4.75 to 9.5. Some 10 to 12 hour data points may be double intervals (?) (i.e., logger-undetected eruptions).May and June 2019 observations indicate that Fountain Geyser's intervals have become longer and more erratic - they ranged from 4.5 to 12 hours long. Many are 7 to 8 hours. This change in behavior from recent correlates with occasional eruptive activity at adjacent Morning Geyser in 2019.Clips 1-5 - Fountain Geyser’s 7:08 to 7:35 PM eruption on 28 July 2017.Clips 6-8 - Fountain Geyser’s 8:48 to 9:18 PM eruption on 6 August 2017. (time stamp 2:02)------------------This video is also posted at:www.youtube.com/watch?v=HdIJbu6m1io------------------19-minute video of Fountain Geyser erupting in 2015-2016 is posted at:www.youtube.com/watch?v=M3a9NF49VNk |
| 撮影日 | 2019-07-15 16:04:01 |
| 撮影者 | James St. John |
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