Collaborative Proposal: Bubble Size Distributions as a Diagnostic Tool for Volcanic Processes

合作提案：气泡尺寸分布作为火山过程的诊断工具

• 批准号: 0509856
• 负责人: Dork Sahagian
• 金额: $ 2.45万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0509856&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Bubble; Size; Distributions

The primary focus of the project is to develop new indirect methods to infer magmatic and vesiculation conditions in volcanic conduits and chambers from statistical analysis of bubble size distributions in vesicular volcanic products. With the appropriate mechanistic framework, bubble size distributions (BSD) should be able to provide a new dimension of understanding of volcanic systems and eruption styles to complement insights that have emerged from petrology, magma chemistry and geophysical observations. In this study, a scientific methodology will be developed for using observed bubble populations to infer the magmatic vesiculation conditions and processes that drive volcanic eruptions. The end result of the study will enable the community to use commonly available vesicular volcanic products as "remote sensing" tools that record magma history prior to and during volcanic eruptions.To achieve this research goal, high quality "observed BSDs" will be obtained from volcanic products to compare with "simulated BSDs" resulting from numerical Monte Carlo simulations of specific vesiculation processes. A synthesis of observed and simulated BSDs will make possible "remote sensing" of magmatic conditions and volcanic eruption drivers (vesiculation processes) by studying the vesiculation history recorded in the BSDs in volcanic rocks. This will have a broader impact in allowing eruption products to be used to more effectively determine eruption processes and ultimately to predict eruption energy, style, and timing for hazard mitigation.

该项目的主要重点是开发新的间接方法，通过对水泡状火山产物中气泡大小分布的统计分析来推断火山导管和火山室中的岩浆和水泡条件。在适当的机制框架下，气泡大小分布（BSD）应该能够为火山系统和喷发风格的理解提供一个新的维度，以补充岩石学，岩浆化学和地球物理观测中出现的见解。在这项研究中，将开发一种科学的方法，利用观察到的气泡群来推断岩浆的泡化条件和驱动火山爆发的过程。这项研究的最终结果将使该社区能够使用通常可用的水泡状火山产物作为“遥感”工具，记录火山爆发之前和期间的岩浆历史。为了实现这一研究目标，将从火山产物中获得高质量的“观测bsd”，并与通过蒙特卡罗数值模拟特定起泡过程得到的“模拟bsd”进行比较。通过研究火山岩中bsd记录的泡化历史，将观测和模拟的bsd综合起来，可以“遥感”岩浆条件和火山喷发驱动因素（泡化过程）。这将产生更广泛的影响，使喷发产品能够更有效地确定喷发过程，并最终预测喷发能量、喷发方式和减灾时间。