Directed Blast - Debris Avalanche Relations at Bezymianny Volcano, Kamchatka

堪察加半岛 Bezymianny 火山的定向爆炸 - 碎片雪崩关系

• 批准号: 9628413
• 负责人: Barry Voight
• 金额: $ 13.6万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628413&HistoricalAwards=false
• 关键词: Directed; Blast; Debris; Avalanche; Relations

9628413 Voight The broad long-term objective of this work is to improve our understanding of magmatic interactions in large-scale volcanic edifices collapse and associated explosive eruptions. magma intrusion may trigger large-scale edifice failure. Rapid edifice failure may in turn provoke destructive explosive events, including the phenomenon known as the 'directed blast'. This project aims at understanding these interactive processes. The best examples of true directed blasts are found at Mount St. Helens (1980), which has been thoroughly studied, and Bezymianny Volcano (1956), which has been little studied. Therefore the proposed research focuses on the Bezymianny blast deposit, and its relation to the debris avalanche that triggered the blast process. The proposed research builds on recent preliminary field studies at Bezymianny by Belousov and Belousov, and collaborating scientists, which suggest that the Bezymianny blast deposits are not analogous with known pyroclastic surge deposits, with the sole exception of Mount St. Helens. Field work will comprise standard techniques of study of stratigraphic relationships, mapping, sampling, sedimentology, and study of bed forms. Samples will be subject to granulometric analyses and studied with SEM, XRD and microprobe. Temperature data will be established from carbonized wood fragments. Grain size distribution, shapes and compositions of particles, together with field observations, will provide the basis for interpretation of eruption processes. The study is expected to have significant implications on volcanic hazards.

9628413 Voight 这项工作的长期目标是提高我们对大规模火山建筑物倒塌和相关爆炸性喷发中岩浆相互作用的理解。 岩浆侵入可能引发大规模的建筑物倒塌。 快速的建筑物故障可能会引发破坏性的爆炸事件，包括被称为“定向爆炸”的现象。 该项目旨在理解这些交互过程。 真正定向爆炸的最佳例子是在圣海伦斯火山 (1980) 和贝济米安尼火山 (1956) 上发现的，该火山已被彻底研究过，而贝济米尼火山 (1956) 却很少被研究。 因此，拟议的研究重点是Bezymianny爆炸沉积物及其与引发爆炸过程的碎片雪崩的关系。 拟议的研究建立在别洛乌索夫和别洛乌索夫以及合作科学家最近对别济米安尼进行的初步实地研究的基础上，这些研究表明别济米安尼爆炸沉积物与已知的火山碎屑潮沉积物并不相似，唯一的例外是圣海伦斯山。 现场工作将包括地层关系研究、测绘、取样、沉积学和地床形态研究的标准技术。 样品将接受粒度分析，并使用 SEM、XRD 和微探针进行研究。 温度数据将从碳化的木材碎片中建立。 颗粒尺寸分布、颗粒形状和成分以及现场观察将为解释喷发过程提供基础。 这项研究预计将对火山灾害产生重大影响。