高温高压弹性波衰减的研究综述

doi:10.11867/j.issn.1001-8166.2001.03.0382

地球科学进展 ›› 2001, Vol. 16 ›› Issue (3): 382 -386. doi: 10.11867/j.issn.1001-8166.2001.03.0382

高温高压弹性波衰减的研究综述

岳兰秀,谢鸿森,周文戈

中国科学院地球化学研究所地球动力学开放研究实验室,贵州贵阳 550002

收稿日期:2000-07-07 修回日期:2000-11-14 出版日期:2001-06-01
通讯作者: 岳兰秀(1972-),女,河北邢台人,硕士生,主要从事高温高压下岩石弹性波衰减的研究. E-mail:lanxiuyue@sina.com
基金资助:
国家自然科学基金项目“上地幔物质相转变的超声测量研究”(编号:49774235)资助.

OVERVIEW OF SEISMIC WAVE ATTENUATION AT HIGH TEMPRATURE AND HIGH PRESSURE

YUE Lan-xiu,XIE Hong-sen,ZHOU Wen-ge

Institute of Geochemistry,Chinese Academy of Science,Guiyang550002,China

Received:2000-07-07 Revised:2000-11-14 Online:2001-06-01 Published:2001-06-01

阐述了弹性波衰减的研究成果,简单介绍了频谱振幅比法和干涉测量技术的弹性波测量方法,并分析了它们的优缺点。描述了引起弹性波衰减的原因,主要包括岩石颗粒边界的接触方式、岩石裂隙之间的流体和高温对弹性波衰减的影响。弹性波衰减的研究对于解释岩石的物理性质和地球内部的结构具有重要的地球物理意义。

关键词: 弹性波衰减, 衰减机理, 高温高压

An overview of seismic wave attenuation is given, including experimental method, attenuation mechanism and application of wave attenuation in Earth science. Two important experimental methods of measuring wave attenuation are introduced. The first method is spectral ratio technique. It is effective for measuring samples with high attenuation. However it has some defects. For example, it is useful for measuring sample’s relative attenuation. And it can’t measure absolute attenuation. The second method is interferometric technique. It surmounts the insufficiency of spectral ratio technique. It can measure sample’s absolute attenuation. But it only measures attenuation of melten samples. There are many factors that control attenuation, including mechanism of grain boundary damping and influence of high temperature. The mechanism of grain boundary damping is divided into two parts that one is the contact manner of grains, the other is intercrystalline thermal currents. Moreover there are much fruit of studying attenuation, which involves the variation of Q with temperature, pressure, and depth, and the attenuation anisotropy of rocks. The investigation of attenuation is important for estimating the structure of rocks and the internal structure of the Earth. At the same time it is useful for judging the elastic properties of rocks including volume modulus, elastic coefficient and so on. So it is necessary to study wave attenuation, especially at high temperature and high pressure.

Key words: Attenuation mechanism., Seismic wave attenuation, High temperature and pressure

中图分类号:

P594

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