Volcanic eruption volume flux estimations from very long period infrasound signals

Volcanic eruption volume flux estimations from very long period infrasound signals
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根据超长周期次声信号估算火山喷发体积通量

DOI:
10.1002/2016gl071047
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发表时间:
2017
期刊:
Geophys. Res. Lett.
影响因子:
--
通讯作者:
M.
M.
中科院分区:
--
文献类型:
--
作者:
Yamada;T.;Aoyama;H.;Nishimura;T.;Iguchi;M. and Hendrasto;M.

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我们研究了伴随火山喷发的很长一段时间的次声信号,这些火山包括印度尼西亚的洛贡-恩蓬火山、日本的麻生火山、库奇诺埃拉布吉马火山和麒麟岛火山。超长周期脉冲的激发与爆炸、喷发柱的出现和火山碎屑密度流有关。我们模拟次声脉冲的激发,假设为单极子源,以量化喷发物质的体积通量和累积体积。次声导出的体积通量和累积体积可以小于视频导出结果的一半。次声体积通量与最大喷发柱高度之间有很大的正相关关系。因此,我们的结果表明,对甚长周期火山次声脉冲的分析有助于估计最大喷发柱高度。
We examine very long period infrasonic signals accompanying volcanic eruptions near active vents at Lokon‐Empung volcano in Indonesia, Aso, Kuchinoerabujima, and Kirishima volcanoes in Japan. The excitation of the very long period pulse is associated with an explosion, the emerging of an eruption column, and a pyroclastic density current. We model the excitation of the infrasound pulse, assuming a monopole source, to quantify the volume flux and cumulative volume of erupting material. The infrasound‐derived volume flux and cumulative volume can be less than half of the video‐derived results. A largely positive correlation can be seen between the infrasound‐derived volume flux and the maximum eruption column height. Therefore, our result suggests that the analysis of very long period volcanic infrasound pulses can be helpful in estimating the maximum eruption column height.
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