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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Analysis of source characteristics of experimental gas burst and fragmentation explosions generated by rapid decompression of volcanic rocks
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Analysis of source characteristics of experimental gas burst and fragmentation explosions generated by rapid decompression of volcanic rocks

机译：火山岩快速减压产生的实验性瓦斯爆炸和碎片爆炸的震源特征分析

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Gas burst and fragmentation explosions induced by rapid decompression of volcanic rocks in a high-pressure autoclave have been analyzed. We performed experiments from 4 to 20MPa on (1) loose pyroclasts and (2) pumice from recent eruptions of Popocatepetl volcano. Our aim is to characterize the source mechanism distinguishing the physical processes that operate in the conduit which determine the dynamics of explosive volcanoes. For this aim we have analyzed experimentally the parameters that indicate the state and behavior of the conduit (i.e., decompression time, fragmentation threshold and speed, forces, and the partitioning of energy), using microseismic monitoring, the decompression time curves, and the sample rheological properties. The initial available potential energy in the system and its partitioning into different types of energies are correlated in space and time with specific stages of the explosive phenomenon. Such correlations, taken together with the energy distribution, enable the distinction of the individual physical processes involved and their causal sequence and relationships. Our observations suggest that in volcanic conduits with regular explosive activity, a source mechanism may operate whereby a causal sequence of processes results in a system that undergoes both rapid and stable transitions. Such behavior may persist over long periods of time.
机译：分析了高压釜中火山岩快速减压引起的瓦斯爆炸和碎片爆炸。我们对（1）松散的火山碎屑和（2）最近Popocatepetl火山喷发的浮石进行了4至20MPa的实验。我们的目的是表征源机制，以区别导管中确定爆炸性火山动力学的物理过程。为此，我们使用微震监测，减压时间曲线和样本，通过实验分析了指示管道状态和行为的参数（即减压时间，碎裂阈值和速度，力和能量分配）。流变性质。系统中的初始可用势能及其划分为不同类型的能量在空间和时间上与爆炸现象的特定阶段相关。这种相关性与能量分布一起，可以区分所涉及的各个物理过程及其因果顺序和关系。我们的观察结果表明，在具有规则爆炸活性的火山管道中，可能会发生源机制，从而因果过程序列会导致系统经历快速且稳定的过渡。这种行为可能会持续很长时间。

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