Imaging the Crustal Structure with Multiple Seismic Measurements

With the rapid development of the portable seismic array technique, seismic waveform data have been accumulating much faster than ever before, which provides us with valuable data for resolving the interior of the Earth. Traditional seismic measurements, such as surface-wave dispersion, body-wave receiver function and travel time, etc., have been widely applied to imaging the crustal and upper mantle structures, which improved our understanding on the geodynamic processes on Earth. At the same time, new types of seismic measurements which make use of the seismic amplitude information, such as the surface-wave ZH ratio (or surface-wave ellipticity), receiver function HV ratio, etc., have also been proposed and successfully applied to imaging crustal structures. As such, it is only natural to jointly use different types of observations in probing the Earth structure. It has been known that different types of seismic measurements have different sensitivities of the Earth structure, and a single type of observation may fail to resolve all structural features that adversely affects the model resolution and interpretation. Joint inversion methods have already been developed with successful applications, such as the joint inversion of surface-wave dispersion and receiver function, and the joint inversion of surface-wave dispersion and surface-wave ZH ratio, etc. These studies demonstrate the necessity of joint inversion of multiple types of observations. In this study, we investigated the properties of different types of seismic measurements, including surface-wave dispersion and ZH ratio, receiver function, and the newly proposed receiver function HV ratio, to explore the feasibility of joint inversion of these measurements