Joint P-and S-Receiver Function Inversion Based on the Bayesian Theory
详细信息
- 责任者：Wang Jun (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Liu Qiyuan
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(1)
- 关键词：纵波 ; P-waves ; 横波 ; S-waves ; 贝叶斯分析 ; Bayesian analysis ; 接收函数 ; receiver functions
- 页码：p.69-78
- 图表：illus., 1 table, 24 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
S-receiver function is valuable for investigating the lithosphere velocity structure.Using synthetic seismogram technique,we have studied dynamic characteristics of S-receiver functions.Based on the Bayesian inversion theory and non-linear inversion technique of the complex spectral ratio of the P-receiver function,a joint P-and S-receiver function inversion technique is proposed in this study.Our results show that(1) epicenter distances are limited to 55°~80° for the S-receiver function inversion and the magnitude of events used in the inversion should be larger than 5.0 for a good enough signal to noise ratio;(2) the SLP conversion on the lithosphere-asthenosphere boundary(LAB) with gradient structure is weaker than that on the sharp LAB,and the sediment is in favor of the SLP conversion at LAB;(3) since the radial component of S-receiver functions is not a delta pulse,the multi-channel maximal likelihood deconvolution technique for three-component receiver function estimation not relying on the source equalization assumption is more suitable for estimating S-receiver function;(4) numerical tests demonstrate that when the deviation of initial model is within 20% from the true model,our method can well predict the model parameters of the crust and upper mantle down to 300 km depth;(5) observational data tests demonstrate that the resultant S-wave velocities at depth larger than 100 km are less well constrained.
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