Tectonic Characteristics of the Tibetan Plateau Based on EIGEN-6C2 Gravity Field Model
Guo Dongmei
Bao Lifeng
Xu Houze
Abstract：Gravity anomaly data are the results of gravity force field by all underground sources,including information in the shallow and deep parts of the earth.The studies of satellite gravity field have been increased in recent years,which provide im-portant information for the study of deep structures under the Tibetan Plateau.Using EIGEN-6C2 gravity field data,we first analyze the Bouguer gravity anomaly and isostatic gravity anomaly from one to five scale decomposition based on multi-resolu-tion analysis method.Then distribution characteristics of gravity anomaly sources in different depths are evaluated with the help of other geophysical factors,in order to recover the geometric characteristics in different scale.Second,we estimate the approx-imate depths of the geologic bodies using the power spectral analysis on the decomposed anomalies from first to fifth order. Third,the edge detection method based on Canny operator is employed to identify the undistinguished fractures,to further de-termine the block boundary in the Tibetan plateau and to divide blocks and sub-blocks that are active tectonically.Final,after sedimentary and lithosphere corrections,the three dimensional Parker-Oldenbarg inverse theory on the Bouguer anomaly is ap-plied to invert Moho depths in Tibetan plateau.
Keywords：Tibet Plateaucrustal structurehigh-order satellitegravity fieldmulti-resolution analysisedge detectioninter-face inversion
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1643-1652 )