Receiver Function Adjoint Tomography for Three-Dimensional High-Resolution Seismic Array Imaging: Methodology and Applications in Southeastern Tibet

GEOPHYSICAL RESEARCH LETTERS(2023)

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摘要
A new technique for P-wave receiver function (PRF) inversion, within the framework of wave equation-based adjoint tomography and referred to as receiver function adjoint tomography (RFAT), has been developed to obtain models of Vp, Vs, and density. This innovative technique fits the synthetic PRFs with observed PRFs and can better image the lateral variations of Vs from the crust to the uppermost mantle than traditional 1-D PRF inversion. We utilized RFAT to perform high-resolution imaging beneath a dense seismic array in Southeastern Tibet, revealing low-velocity zones extending from the uppermost mantle to the crust, as well as an eastward dipping Moho under the Red River Fault (RRF). Our inversion results provide direct evidence for the existence of a distinct asthenospheric upwelling channel beneath the RRF, and further highlight the effectiveness of RFAT for accurately imaging subsurface structures. We have developed a novel technique that allows for direct inversion of P-wave receiver functions for a detailed 3-D S-wave velocity model. By applying this technique to a dense seismic array located in the southeastern margin of the Tibetan Plateau, we can resolve detailed crustal and uppermost mantle structures with strong lateral variations. The results indicate that the boundary faults of the geological blocks play a critical role in controlling the lateral variations of the crustal and upper mantle structures. Our findings provide new insights into the dynamics of lithosphere-asthenosphere interactions and continental collision processes in this region. A new method of 3-D adjoint tomography for receiver function inversion is developedLateral heterogeneities of crust and uppermost mantle can be well resolved by this methodThe method reveals vertically extending low-velocity zones under the Red River Fault due to mantle upwelling
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