全球地震各向异性数据汇编及相关研究综述
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摘要
地震各向异性是我们了解地球内部结构及其演化过程的重要信息之一,同时为岩石圈及其下部地幔在过去和现在相当长时间范围内的变形特征提供了关键性的约束.Schutt和Fouch及Wüstefeld等分别于2001和2009年对地震各向异性数据进行了汇编.本文在此基础上,收集了最新的相关观测数据,并对其进行了建库处理,数据收集过程中,我们更加注重原始数据中关于地震震源深度和震级等方面的参数收集,这些地震各向异性的观测数据,基本覆盖了NUVEL-1A模型中除可可斯和斯科舍板块以外的13个板块.这些地震各向异性数据尽管来源不同,数据质量参差不齐,给我们进行统一数据汇编带来了一定的困难,但很显然,作为基础数据,其汇编与统计分析工作还是很有意义的.相关的研究工作已经表明,地震各向异性可以用来反映俯冲带流动场的主导因素,我们对这些汇编数据的初步统计分析也显示,地震各向异性与全球板块运动及应力场特征之间均存在着较好的相关性.尽管在板块与板块间的边界带,尤其是俯冲带地区,其相关性相对较差,这可能是由于板块俯冲机制的复杂性及上地幔中固态岩石层与软流层相对非定向流动的复杂性造成的.
Seismic anisotropy is one of the important information for us to understand the structure of earth interior and the evolutionary process,and it provides a key constraint on the character of past and present deformation in the lithosphere and sublithospheric mantle for a quite long period.Schutt and Fouch and Wüstefeld have been compiled the global seismic anisotropy data in 2001 and 2009.This paper based on this,collected the latest related observation data,and then create a newest database,in the process of data collecting,we pay more attention to the original data for collecting other parameters such as the focal depth and magnitude,these observed seismic anisotropy data mainly covered 13 plates in NUVEL-1A model except the Cocos and Scotia plates.These seismic anisotropy data although get from different source,data quality is uneven,and brings us certain difficulties in compiling the unified data,but obviously,it is very meaningful for compiling and statistical analysis these basic data.Related studies shows that seismic anisotropy can be used to reflect the dominant factors of flow field in subduction zones,and we have preliminary statistical analysised these compiled data and it shows that,a significant positive correlation between seismic anisotropy and global plate motion as well as stress field are for most of the global plates,although in the boundaries between plates and plates,especially in subduction zones,the correlation are relatively poor.This may be due to the complexity of plate subduction mechanism or the complexity of the relatively non-directed flow about the solid rock mass and asthenosphere in upper mantle.
Seismic anisotropy is one of the important information for us to understand the structure of earth interior and the evolutionary process,and it provides a key constraint on the character of past and present deformation in the lithosphere and sublithospheric mantle for a quite long period.Schutt and Fouch and Wüstefeld have been compiled the global seismic anisotropy data in 2001 and 2009.This paper based on this,collected the latest related observation data,and then create a newest database,in the process of data collecting,we pay more attention to the original data for collecting other parameters such as the focal depth and magnitude,these observed seismic anisotropy data mainly covered 13 plates in NUVEL-1A model except the Cocos and Scotia plates.These seismic anisotropy data although get from different source,data quality is uneven,and brings us certain difficulties in compiling the unified data,but obviously,it is very meaningful for compiling and statistical analysis these basic data.Related studies shows that seismic anisotropy can be used to reflect the dominant factors of flow field in subduction zones,and we have preliminary statistical analysised these compiled data and it shows that,a significant positive correlation between seismic anisotropy and global plate motion as well as stress field are for most of the global plates,although in the boundaries between plates and plates,especially in subduction zones,the correlation are relatively poor.This may be due to the complexity of plate subduction mechanism or the complexity of the relatively non-directed flow about the solid rock mass and asthenosphere in upper mantle.
引文
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