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.