Region-related features of crustal and upper-mantle velocity structure of the Chinese mainland detected by surface waveform modeling

摘要

Surface waveform modeling has played an important role on many continental-scale studies of upper mantle ve- locity structure, but it was seldom applied to the Chinese mainland study. The present study firstly analyzed sur- face waveform fittings for eight wave paths crossing through four different regions of the Chinese mainland (east- ern, central, northern and western China), and then inverted for 1D path-averaged S-velocities for these paths. The inverted crustal and upper-mantle S-velocities showed obvious region-related features, which are well consistent with known geotectonic units and previous research results. These results indicate that surface waveform modeling is a reliable method to get crustal and upper-mantle velocity structure. Furthermore, this method has a prominent advantage in detecting upper-mantle structure compared with fundamental-mode surface-wave dispersion method.