Mt. Fuji Holocene eruption history reconstructed from proximal lake sediments and high-density radiocarbon dating
Mt. Fuji Holocene eruption history reconstructed from proximal lake sediments and high-density radiocarbon dating
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DOI：
10.1016/j.quascirev.2018.09.001
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发表时间：
2017-12
影响因子：
4
通讯作者：
S. Obrochta;Y. Yokoyama;M. Yoshimoto;S. Yamamoto;Y. Miyairi;G. Nagano;A. Nakamura;K. Tsunematsu;Laura Lamair;A. Hubert‐Ferrari;B. Lougheed;A. Hokanishi;A. Yasuda;Vanessa M. A. Heyvaert;M. Batist;O. Fujiwara
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文献类型：
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作者：
S. Obrochta;Y. Yokoyama;M. Yoshimoto;S. Yamamoto;Y. Miyairi;G. Nagano;A. Nakamura;K. Tsunematsu;Laura Lamair;A. Hubert‐Ferrari;B. Lougheed;A. Hokanishi;A. Yasuda;Vanessa M. A. Heyvaert;M. Batist;O. Fujiwara
一份来自本藤湖(富士五湖)的8000年的湖泊沉积记录记录了几次火山喷发，包括可能未被报道的事件。富士火山，每年接待约4700万游客。通过对陆相大型化石和块状有机质进行高密度放射性碳测年，建立了高保真年龄模型。湖泊储集层年龄的可变性受到现代湖水放射性碳测量和火山灰历法年龄的反向定标的限制。我们提供了已知喷发的更准确的年龄，检测到几次喷发的喷射物的更广泛分布，包括最近的顶峰喷发，并可能确定以前未发现的侧翼喷发。在陆基调查中，可能很难将分布紧密的焦落层作为独立的事件区分开来。这些结果表明，湖泊沉积物是了解火山喷发特征的有力工具。
An 8000-year lacustrine sediment record from Lake Motosu (Fuji Five Lakes) records several eruptions, including potentially unreported events, of the active Mt. Fuji volcano, which receives approximately 47 million annual visitors. A high-fidelity age model is constructed from tephra ages and high-density radiocarbon dating of terrestrial macrofossil and bulk organic matter. Variability in lake reservoir age is constrained by modern lake water radiocarbon measurement and reverse calibration of tephra calendar ages. We present more accurate ages for known eruptions, detect a wider distribution of ejecta for several eruptions, including the most recent summit eruption, and potentially identify previously undetected flank eruptions. There are closely spaced scoria-fall layers that may be difficult to differentiate as separate events in land-based surveys. These results demonstrate the utility of lacustrine sediments as powerful tools for understanding characteristics of volcanic eruptions.