Effective elastic thickness of the lithosphere from joint inversion in western China and its implications  

作　　者：Wen Shi Shi Chen Jiancheng Han 

机构地区：[1]Institute of Geophysics,China Earthquake Administration,Beijing 100081,China [2]Beijing Baijiatuan Earth Science National Observation and Research Station,Beijing 100095,China

出　　处：《Earthquake Science》2020年第1期1-10,共10页地震学报（英文版）

基　　金：This work is supported by the Special Fund of the Institute of Geophysics;China Earthquake Administration(No.DQJB20K31);the National Key R&D Program of China(Nos.2018YFC0603502 and2017YFC1500503);the National Natural Science Foundation of China(Nos.41774090 and U1939205);financial support by China Postdoctoral Science Foundation(No.2018M641424)。

摘　　要：The western China lies in the convergence zone between Eurasian and Indian plates.It is an ideal place to study the lithosphere dynamics and tectonic evolutions on the continental Earth.The lithospheric strength is a key factor in controlling the lithosphere dynamics and deformations.The effective elastic thickness(T_(e))of the lithosphere can be used to address the lithospheric strength.Previous researchers only used one of the admittance or coherence methods to investigate the T_(e) in the western China.Moreover,most of them ignored the internal loads of the lithosphere during the T_(e) calculation,which can produce large biases in the T_(e) estimations.To provide more reliable T_(e) estimations,we used a new joint inversion method that integrated both admittance and coherence techniques to compute the T_(e) in this study,with the WGM2012 gravity data,the ETOPO1 topographic data,and the Moho depths from the CRUST1.0 model.The internal loads are considered and investigated using the load ratio(F).Our results show that the joint inversion method can yield reliable T_(e) and F values.Based on the analysis of T_(e) and F distributions,we suggest(1)the northern Tibetan Plateau could be the front edge of the plate collision of Eurasian and Indian plates;(2)the southern and part of central Tibetan Plateau have a strong lithospheric mantle related to the rigid underthrusting Indian plate;(3)the southeastern Tibetan Plateau may be experiencing the delamination of lithosphere and upwelling of asthenosphere.

关 键 词：effective elastic thickness joint inversion western China gravity anomaly lithospheric strength 

分 类 号：P313[天文地球—固体地球物理学]