The lithosphere-asthenosphere boundary revealed by S-receiver functions from the Hi-CLIMB experiment

Physics

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Body Waves, Dynamics Of Lithosphere And Mantle, Asia

Scientific paper

Detailed high-resolution images of the crust-mantle and lithosphere-asthenosphere boundaries (the Moho and the LAB, respectively) have been well observed by applying an S-receiver function technique to data collected by the Hi-CLIMB (Himalayan-Tibetan Continental Lithosphere During Mountain Building) experiment. The Moho depth variation in the range of ˜50-70 km is in good agreement with that from previous P-receiver function results. The significant variation in the LAB depth indicates that the subducting Indian lithosphere drops northwards from a depth of ˜80 km beneath the Himalayas to ˜130 km just north of the Bangong-Nujiang suture at ˜33.0°N, and undergoes a transition from low angle to flat subduction beneath the Yarlung-Zangbo suture. Our findings provide new seismic constraints on the 3-D subducting configuration of the Indian lithosphere beneath Tibet.

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