The existence of a partially molten S-wave-attenuating layer at the base of the lunar mantle is a topic of long-standing debate.To address this contentious issue,herein,domestic and international studies on the viscoelastic structure of the lunar mantle's lower region are meticulously reviewed.Furthermore,a comprehensive overview of the origins and historical development of this matter is provided,followed by an in-depth analysis of the crucial factors contributing to the ongoing controversy.While an increasing number of studies lend support to the presence of a partially molten low-viscosity layer that attenuates the S-wave at the base of the lunar mantle,definitive evidence remains lacking.Finally,the limitations of existing studies are discussed,and future research endeavors to be undertaken are provided.
Moonsolid tideTidal Love numberviscoelastic modelinternal structure
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