Continental Crustal Composition and Evolution: Constraints from Receiver Function Analysis

该项目旨在通过同时测量地壳厚度、泊松比（可由横波与纵波之比唯一确定）和地壳纵波速度，以及分布在各大洲约200个宽带地震台站下的地壳纵波速度，为大陆地壳的演化和组成提供新的或改进的约束模型。大约80,000个源归一化宽带地震图将被目视检查并用于拟议的研究。该研究将使用pi开发的一组计算机代码来搜索站下三个参数的最佳组合，并使用自举程序来估计测量误差。将检查每个站点下是否存在倾斜的mohot。该项目的另一部分是收集一套已发表的构造历史和岩石学数据，这些数据来自于每个台站附近的下地壳捕虏体或地形，与下地壳的组成和演化有关。这些地质资料将用于解释地震结果。地球化学家、矿物物理学家和地球动力学家将利用所提出的预期结果来解决有关早期地壳和地幔形成和演化的一系列重要问题。因此，这项研究的影响应该超越地震学界。

The project is aimed at providing new or refined constraintson models of evolution and composition of the continental crust,by simultaneously measuring crustal thickness, Poisson's ratiowhich can be uniquely determined by the ratio between P and S-wavevelocities, and crustal P-wave velocities beneath about 200 broadbandseismic stations distributed all over the continents.About 80,000 source-normalized broadband seismograms will bevisually checked and used for the proposed study. A set of computercodes that the PIs developed to search for the optimal combinationof the three parameters beneath a station will be used for the study,and the bootstrap procedure will be used to estimatethe errors of the measurements. The existence of dipping Mohobeneath each of the stations will be examined. Another part ofthe project is for the collection of a set of published tectonichistory and petrological data obtained from lower crustal xenolithsor terrains related to the composition and evolution of the lower crustinthe vicinity of each of the stations. Those geological data willbe used for the interpretation of the seismological results.Expected results from the proposed work will be used bygeochemists, mineral physicists, and geodynamicists to address abroad range of important questions regarding the formation and evolutionof early crust and mantle. Thus this study should have an impact that isbeyond the seismological community.