【作者】 梁春涛；

【导师】 朱介寿； 曹家敏；

【作者基本信息】 成都理工学院 ， 地球探测与信息技术， 2001， 硕士

【摘要】 近年来，用地震学的方法对地球内部结构的研究迅猛发展。全球性的和区域性的多参数，多震相的地震波层析成像广泛开展。虽然国内学者在这方面也做了大量富有成效的探索，但多局限在局部的上地幔以上结构的研究。受国家自然科学基金重点项目（49734150）的资助，本文引入国际上已经日趋完善的体波层析成像方法技术，利用本地区丰富的天然地震波走时资料及ISC报告资料，对中国及邻区地壳，上地幔及下地幔，直至核幔边界的地球结构进行探索性的研究，填补我国在地幔层析成像研究领域的空白。 本文主要研究成果有： （1）在国内第一次实现了对深至下地幔的地球结构的层析成像。研究成果同Harvard大学同类全球性研究的对比表明，相同区域的地球结构，从总体上来说是基本一直的。 （2）“球坐标系下精确的三维射线追踪“保证了正演的可靠性。和过去被经常使用的弯曲法的对比研究表明，该方法能更精确地再现地球内部速度结构同地震波传播路径和走时之间的关系。 （3）把并行算法引入到正演计算之中。使困扰试射法射线追踪的高时间支出问题得以解决，同时使海量地震数据被应用于研究成为可能。 （4）对层析成像的各个环节都作了大量的理论计算以确保理论和方法的可靠性。比如，在各种不同的理想化的构造模型中，对正演和反演进行了模拟。 （5）开发了大量实用的数据处理程序，一方面使大批量的地震数据的处理更加方便，高效；图形化的数据处理也使得对原始资料和反演结果的分析建立在更直观的基础之上。 同国际上相同领域的研究相比，研究中仍有很多不完善的地方，比如：在资料预处理方面，震中的从新定位是非常必要的；同时，在研究当中应该引入更多的先验信息对反演结果加以约束，比如在初始模型中加入间断面，同时考虑多震相联合反演等，采用等面积模型分区方法等。更多还原

【Abstract】 The Body Wave Tomography of East Asia and Adjacent AreaAbstractIn recent years, the researches of earth interior structure by means of seismology have been developing very quickly and the global and local researches with multi-parameters and multiphase readings included are widely carried out. A lot of fruitful development had been made by many Scholars in China, but their aims are mainly concentrated on the local structure no deeper than the uppermost mantle. Funded by the NSF key project (49734150) , this research introduced the technologies and methods which had been developed very well in world wide, making full use of the plenty of natural earthquake travel time dada of China and that from ISC, to do some precursory research of the structure of the crust, uppermost and lowermost mantle under the East Asia and the neighboring Areas, and this will fill the gap between China and International in the field of mantle tomography.The main fruits of this paper are as follows:(I)It’s the first time to probe into the velocity structure deeper to the lowermost mantle of the Earth in China. Compared with the similar global research of Harvard University, the structure of the same area in two researches are generally in accordance with each other.(2)The reliability of the forward modeling is based on the accurate 3D ray tracing in spherical coordinates? Compared with the frequently used bending method, this method can present the accurate relationship between the velocity structure and the propagating path and travel times of seismic waves.(3)The parallel algorithm is introduced into the forward modeling. This resolves the problem of time consuming which has been a big problem of shooting method. At the same time, it makes it possible to include huge number of seismic data into the research.(4)To test the reliabilities of the theories and technologies, many theoretical simulation calculations have been conducted in every step of Tomography. For instance, the test ray-tracing and inversion in different theoretical model.(5)A lot of useful data processing programs are coded to facilitate and visualize the analysis of massive of crude data and the inversion result.Actually, More latest developments in this filed should be introduced into this research, such as, the hypocenter relocation, joint inversion of velocity structure and the topography of some discontinuity boundaries, and the joint inversion of multi-phase, equi-area model parameterization and so on.更多还原