Continental Crustal Composition and Evolution: Constraints from Receiver Function Analysis

该项目的目的是通过同时测量地壳厚度、由P波和S波速度之比唯一确定的泊松比以及分布在大陆各地的大约200个宽带地震台下方的地壳P波速度，来提供新的或改进的大陆地壳演化和成分的约束模型。大约8万张震源标准化的宽带地震记录将用于拟议的研究。PIS为寻找站下三个参数的最佳组合而开发的一组计算机代码将用于研究，并将使用Bootstrap程序来估计测量的误差。每个站点都将检查是否存在浸泡过的Mohobeneath。该项目的另一部分是收集一套已发表的构造史和岩石学数据，这些数据来自下地壳捕虏体或地体，与每个站附近的下地壳的组成和演化有关。这些地质数据将用于解释地震学结果。地球化学家、矿物物理学家和地球动力学家将利用拟议工作的预期结果来解决有关早期地壳和地幔的形成和演化的一系列重要问题。因此，这项研究应该会产生超出地震界的影响。

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.