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Influence of decompression rate on fragmentation processes: An experimental study

机译:减压速率对破碎过程的影响:一项实验研究

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摘要

A key for an effective early warning (or even a forecasting) system for volcanic eruptions, lies in the understanding of volcanic processes and the correct interpretation of monitoring data. Here, we investigate the processes occurring in the upper conduit, at the phase transition between melt and the surrounding rock, characterizing the fragmentation threshold and speed. Fragmentation experiments using a shock tube were performed, to address the following questions: (1) how does sample/conduit size affect fragmentation processes? (2) what is the impact of different decompression rates and differing stress distributions in the sample on fragmentation threshold and speed? The observed fragmentation behaviour is analyzed in terms of energy density and compared with recent related studies. A 2D fragmentation mechanism is presented, based on the arrangement of cracks in fragmented samples. A numerical model for the estimation of the first principle stress distribution before the magma failure is provided.
机译:有效的火山爆发预警(甚至预报)系统的关键在于对火山过程的理解和对监测数据的正确解释。在这里,我们研究熔体与周围岩石之间的相变在上部导管中发生的过程,表征碎裂阈值和速度。进行了使用激波管的破碎实验,以解决以下问题:(1)样品/导管尺寸如何影响破碎过程? (2)不同的减压率和样品中不同的应力分布对破碎阈值和速度有何影响?根据能量密度分析观察到的碎片行为,并将其与最近的相关研究进行比较。基于碎片样品中裂缝的排列,提出了一种二维碎片机理。提供了一个数值模型,用于估算岩浆破坏之前的第一主应力分布。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2010年第4期|P.182-188|共7页
  • 作者单位

    Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Theresienstr, 41/III, D-80333 Munich, Germany;

    rnDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Theresienstr, 41/III, D-80333 Munich, Germany;

    rnDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Theresienstr, 41/III, D-80333 Munich, Germany;

    rnDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Theresienstr, 41/III, D-80333 Munich, Germany;

    rnDepartment of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Theresienstr, 41/III, D-80333 Munich, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fragmentation; volcanology; threshold; stress distribution; energy density; decompression rate;

    机译:碎片化火山学阈;应力分布能量密度;减压率;

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