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首页> 外文期刊>The island arc >Simultaneous measurements of compressional wave and shear wave velocities, Poisson’s ratio, and Vp/Vs under deep crustal pressure and temperature conditions: Example of silicified pelitic schist from Ryoke Belt, Southwest Japaniar_695 30..39
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Simultaneous measurements of compressional wave and shear wave velocities, Poisson’s ratio, and Vp/Vs under deep crustal pressure and temperature conditions: Example of silicified pelitic schist from Ryoke Belt, Southwest Japaniar_695 30..39

机译：在深地壳压力和温度条件下同时测量压缩波和剪切波的速度，泊松比和Vp / Vs：来自日本西南部Ryoke带的硅化胶泥片岩的实例iar_695 30..39

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摘要

The ultrasonic technique for measuring travel times of compressional and shear waves using dual-mode transducers was adapted to a piston cylinder apparatus, allowing simultaneous measurements of travel times of compressional and shear waves of island arc samples under the high pressure and temperature conditions of island arcs. This method enables us to determine elastic properties and their pressure and temperature derivatives simultaneously. Furthermore, Vp/Vs can be directly determined from travel times of compressional and shear waves independently of length change due to compression or thermal expansion of rock samples under deep crustal conditions, providing more accurate Vp/Vs values than those determined from individual measurements of travel times of both elastic wave types using single-mode transducers. Experimental techniques and results are demonstrated using data on silicified pelitic schist from the Ryoke Belt to 0.6 GPa. The simultaneous measurement gives Vp = 5.60 km/s, Vp/P = 0.090 (km/s)/GPa, Vs = 3.37 km/s, Vs/ P = 0.05 (km/s)/GPa, s = 0.216, and Vp/Vs = 1.66 at ambient conditions. The temperature derivatives were constrained from fitting using linear functions of temperature, yielding Vp/T = -0.518 ￥ 10-3 (km/s)/K and Vs/T = -0.182 ￥ 10-3 (km/s)/K. Performing simultaneous measurements of travel times of compressional and shear waves using dual-mode transducers, it is possible to accurately determine Vp/Vs and Poisson’s ratio of crustal minerals and rocks at deep crustal conditions to study the composition of the crustal interior, e.g. rock types and fluids below the hypocentral region of earthquakes or around bright spots.
机译：使用双模式换能器测量压缩波和剪切波的行进时间的超声技术适用于活塞缸设备，从而可以在岛弧的高压和高温条件下同时测量岛弧样品的压缩波和剪切波的行进时间。这种方法使我们能够同时确定弹性特性及其压力和温度导数。此外，Vp / Vs可以直接根据压缩波和剪切波的传播时间来确定，而与在深地壳条件下岩石样品的压缩或热膨胀引起的长度变化无关，从而提供比从单独的传播测量中确定的值更准确的Vp / Vs值使用单模换能器的两种弹性波类型的时间。实验技术和结果通过使用从Ryoke带至0.6 GPa的硅质化胶质片岩的数据进行了证明。同时测量得出Vp = 5.60 km / s，Vp / P = 0.090（km / s）/ GPa，Vs = 3.37 km / s，Vs / P = 0.05（km / s）/ GPa，s = 0.216和Vp / Vs = 1.66在环境条件下。使用温度的线性函数对温度导数进行拟合约束，得出Vp / T = -0.518 ￥ 10-3（km / s）/ K和Vs / T = -0.182 ￥ 10-3（km / s）/ K。使用双模传感器同时测量压缩波和剪切波的传播时间，可以精确确定深地壳条件下地壳矿物与岩石的Vp / Vs和泊松比，从而研究地壳内部的组成，例如地震震中区以下或亮点附近的岩石类型和流体。

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