DA – H – κ : A Generic Method to Determine 6D Crustal Structure by <i>P</i> Receiver Functions

A teleseismic P receiver function (RF) carries information on the first-order structures of crustal thickness and P- to S-velocity ratio (VP/VS) as well as the second-order structures of Moho dip and crustal anisotropy. The first-order and the second-order structures have trade-off effects on RFs, but the commonly used methods try to extract either the first-order or the second-order structures using part of the features of RFs. We thus propose a more generic approach, DA–H–κ, to incorporate the advantages of the commonly used methods to simultaneously determine the first-order and second-order structures using more features of the RFs. Then, the approach was applied to analyze synthetic RFs and observational RFs of the Longmenshan fault belt. The results show that the new approach is able to extract crustal thickness, average VP/VS, geometry of the Moho and crustal anisotropy reasonably well, especially in areas with complex tectonic settings.