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首页> 外文期刊>東京大学地震研究所彙報 >Influence of Water on Earthquake Generation along Subduction Zones
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Influence of Water on Earthquake Generation along Subduction Zones

机译:水对俯冲带地震的影响

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摘要

To understand the physical bases of earthquake generation along subducting plate boundaries, it is important to know the physical properties of rocks, asperity distribution, and presence of water at the plate interface. Two seismic experiments in the Japan Trench and the Izu-Bonin Trench revealed a strong correlation for aseismic zone and intense seismic reflections, and the possibility of a low-temperature phase of serpentine at subducting plate boundaries. Serpentine layer or high water contents in the layer may cause intense seismic reflections. Free water and/or low-temperature serpentine mineral may act as a lubricant at the subducting plate boundary, and large earthquakes may be controlled by the presence of these materials. We propose three types of subduction zone around the Japan arc and the Izu-Bonin arc to characterize earthquake generation in each subduction zone. Earthquake occurrence in three typical subduction zones may be controlled by differences in the free water contents of rocks and hydrous minerals along subduction boundaries. Dehydration of hydrous phases brings other conditions related to earthquake generation.
机译:要了解沿俯冲板块边界发生地震的物理基础,了解岩石的物理性质,粗糙分布和板块界面处的水非常重要。在日本海沟和伊豆-波宁海沟进行的两次地震实验表明,地震带与强地震反射之间存在很强的相关性,并且在俯冲板块边界处可能有蛇纹石的低温相。蛇形层或该层中的高水含量可能引起强烈的地震反射。自由水和/或低温蛇纹石矿物可能在俯冲板块边界处起润滑剂的作用,大地震可以通过这些物质的存在来控制。我们提出了围绕日本弧和伊豆-波宁弧的三种俯冲带类型,以表征每个俯冲带的地震发生。在三个典型的俯冲带中发生的地震可以通过沿俯冲边界的岩石和含水矿物的自由水含量的差异来控制。含水相的脱水带来了与地震发生有关的其他条件。

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