Continental Crustal Composition and Evolution: Constraints from Receiver Function Analysis

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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.