接收函数方法及其新的进展  

The receiver function method and its new progress

作　　者：贺传松[1] 王椿镛[1] 吴庆举[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《地球物理学进展》2003年第2期224-228,共5页Progress in Geophysics

基　　金：地震联合基金项目 ( 10 10 89)资助 .

摘　　要：远震P波波形数据中包含了大量地震台站下方地壳和上地幔速度间断面所产生的PS转换波及其多次反射波的信息 ,由此提取的接收函数是了解地壳上地幔速度细结构的重要步骤手段之一 .最近几年 ,接收函数和面波联合反演方法获得了较大的成功 ,两种分别对两种波形进行拟合 ,对反演的速度结构提供了有效的约束 .地震勘探中的一些成熟技术被引进接收函数的数据处理 ,使其可用于地壳和上地幔主要速度界面的侧向变化研究 .为增强接收函数的信噪比 ,将不同事件提取的接收函数进行分类 ,按方位角进行叠加 ,可以反应一些速度界面的横向变化 ,接收函数方法可用于PS转换震相的剪切波分裂研究 .泊松比是推测地球内部物质构成的有效参数之一 .接收函数方法分离出的转换波为获取泊松比提供了一条行之有效的便捷途径 ,单一的地震台远震记录中转换波可以估计点位下面地壳的VP/VS 值 .另一方面 ,一些最新的反演技术被引入接收函数的反演 .例如 ,格子收索方法力图解决接收函数反演中的不稳定性和非唯一性问题 ,格子搜索设计比较容易地结合先验约束并保证搜索是全空间的 ,避免了使用任何初始模型 ,该方法能保证在格子的间隔和参数的限度内获得全局最小 ,该方法被用于中东、南美及临近地区的深部结构 .The teleseismic P waveform includes a lot of information which are PS converted phase and P multiple produced by the interface of crust and mantle underneath the stations, and we can obtain the receiver function from it, The receiver function offers an approach to understand the fine structure of crust and mantle. Recently, the joint inversion of receiver function and surface wave obtained success. Two kinds of the waveform synthetic offers an efficient constrain for the velocity structure of inversion. Some techniques, which routinely applied in the seismic exploration, are used for receiver function processing. It can research the horizontal variation of main velocity interface of crust and mantle. In order to enhance S/N ratio, the receiver functions of the different event are sorted and added according to the azimuth. It can respond to the horizontal variation. The receiver function may use to understand the shear split of PS converted phase. The Passion ratio is an efficient parameter inferring the constitution of earth interior. The converted phases, which are isolated from the receiver function, offers an efficient approach to obtain the Passion ratio. The converted phase of the teleseismic record can estimate the V P/V S ratio in the crust. On the other hand, some newest inversion approaches are induced to the receiver function inversion. For example, it is easy that the grid search modeling cooperate prior constrain and guarantee the search is the global minimum in the whole parameter space. It avoids using any preliminary model. It was used to infer from the deep structure in Middle east and South American. The neighborhood algorithm, which makes use of the geometrical constructs, is a kind of non-linear inversion approach. It avoid some defect of the prior approach (genetic algorithm, simulated annealing), for instance, a lot of samples give up and induced lot of parameter etc. The algorithm is used inferring the deep structure at Wudalianchi volcano area and Tengchong volcano area and geodynamic res

关 键 词：接收函数 S波速度结构 反演 

分 类 号：P315[天文地球—地震学]