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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Subplinian fall deposits of Inyo Craters, CA
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Subplinian fall deposits of Inyo Craters, CA

机译：加利福尼亚Inyo Craters的亚平西秋季沉积物

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摘要

The Inyo volcanic chain in east central California last erupted explosively around 1350 A.D., ejecting 0.13 km~3 of tephra during four successive eruptions from the South Deadman. Obsidian Flow, and Glass Creek vents. The first two eruptions, from South Deadman, produced bent, pulsating subplinian columns separated by a period of column collapse. The Obsidian Flow eruption began with a phreatomagmatic vent-clearing blast, then continued with a sustained weak plume. The last and largest eruption, from the Glass Creek vent, produced a sustained subplinian eruption marked by a mid-eruption period of phreatomag-matism. These eruptions dispersed more than 0.27 km~3 tephra over an area greater than 9000 km~2. Inversion of the deposits produced column heights ranging between 6 and 20 km, with wind speeds in excess of 30 m/s, the highest windspeed included in the nomograms. Inversion results suggest limitations of the nomograms for weak plumes due to their simplifying assumptions regarding the influence of the eruption column on ambient flow.
机译：加利福尼亚中部东部的印约火山链最后一次爆炸是在公元1350年左右发生的，在连续4次从南亡者火山喷发中喷出了0.13 km〜3的提菲拉。黑曜石流和玻璃溪喷口。来自南戴德曼（South Deadman）的前两次喷发产生弯曲的脉动亚平流层柱，并被一段时间的柱塌陷隔开。黑曜石流喷发始于吞噬岩浆清除通气爆炸，然后持续持续的弱羽状流。来自格拉斯克里克喷口的最后一次也是最大的喷发，产生了持续的亚平流层喷发，其特征是吞噬作用的中期喷发。这些喷发在大于9000 km〜2的区域内散布了超过0.27 km〜3个特发拉。沉积物的反演使柱高在6至20 km之间，风速超过30 m / s，这是列线图中包含的最高风速。反演结果表明，由于有关羽化柱对环境流量影响的简化假设，弱羽流的诺模图受到限制。

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