Peeling linear inversion of upper mantle velocity structure with receiver functions
Xuzhang Shen1, Huilan Zhou2
1 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 2 Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Peeling linear inversion of upper mantle velocity structure with receiver functions
Xuzhang Shen1, Huilan Zhou2
1 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 2 Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
摘要A peeling linear inversion method is presented to study the upper mantle (from Moho to 800 km depth) velocity structures with receiver functions. The influences of the crustal and upper mantle velocity ratio error on the inversion results are analyzed, and three valid measures are taken for its reduction. This method is tested with the IASP91 and the PREM models, and the upper mantle structures beneath the stations GTA, LZH, and AXX in northwestern China are then inverted. The results indicate that this inversion method is feasible to quantify upper mantle discontinuities, besides the discontinuities between 3hM (hM denotes the depth of Moho) and 5hM due to the interference of multiples from Moho. Smoothing is used to overcome possible false discontinuities from the multiples and ensure the stability of the inversion results, but the detailed information on the depth range between 3hM and 5hM is sacrificed.
Abstract：A peeling linear inversion method is presented to study the upper mantle (from Moho to 800 km depth) velocity structures with receiver functions. The influences of the crustal and upper mantle velocity ratio error on the inversion results are analyzed, and three valid measures are taken for its reduction. This method is tested with the IASP91 and the PREM models, and the upper mantle structures beneath the stations GTA, LZH, and AXX in northwestern China are then inverted. The results indicate that this inversion method is feasible to quantify upper mantle discontinuities, besides the discontinuities between 3hM (hM denotes the depth of Moho) and 5hM due to the interference of multiples from Moho. Smoothing is used to overcome possible false discontinuities from the multiples and ensure the stability of the inversion results, but the detailed information on the depth range between 3hM and 5hM is sacrificed.
基金资助:the basic research and development fund from Institute of Earthquake Science, China Earthquake Administration (grant No. 2011IESLZ05) and National Natural Science Foundation of China (grant Nos. 40574024 and 40374009)
通讯作者:
Xuzhang Shen
E-mail: shenxzh@gmail.com
引用本文:
Xuzhang Shen, Huilan Zhou. Peeling linear inversion of upper mantle velocity structure with receiver functions[J]. 《地震学报》英文版, 2012, 25(1): 65-74.
Xuzhang Shen, Huilan Zhou. Peeling linear inversion of upper mantle velocity structure with receiver functions. Earthquake Science, 2012, 25(1): 65-74.
