Peng Zou^1,2, Jiubing Cheng¹, Tengfei Wang¹, Haijiang Zhang¹

¹State Key Laboratory of Marine Geology, Tongji University, Shanghai, China

²School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China

Abstract：We have developed a novel deconvolution-based reverse time migration method to image lithospheric structures using teleseismic data recorded by dense seismic arrays. Unlike traditional approaches that rely on the retrieval of Green's functions (or receiver functions), the new method directly utilizes the recorded three-component (3-C) seismic waveforms to reconstruct subsurface wavefields, which has the advantage of avoiding the estimation and removal of source time function. Importantly, it enables the asymptotic estimation of P-to-S transmission conversion coefficients at the elastic discontinuities and enhances resolving power for the fine-scale heterogeneities. Taking these improvements, we have obtained a full three-dimensional (3-D) high-resolution image of the subduction zone beneath southwest Japan. This image provides a comprehensive configuration of the severely deformed subducting plate beneath the Kii Channel and Kinki Peninsula.

Full Article:https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL107446