P wave receiver functions reveal thinner mantle transition zone and low crustal velocity layer beneath Longqi hydrothermal vent at the ultra-slow spreading Southwest Indian Ridge

Hao Hu1, Aiguo Ruan2, Jiabiao Li3, Xiongwei Niu3, Xiaodong Wei4, Jie Zhang2 and Aoxing Wang2, (1)Zhejiang University, Department of Earth Science, Hangzhou, China, (2)Second Institute of Oceanography, State Oceanographic Administration of China, Hangzhou, China, (3)Second Institute of Oceanography, Ministry of Natural Resources, Key Laboratory of Submarine Geosciences, Hangzhou, China, (4)Second Institute of Oceanography, Ministry of Natural Resources, China, Hangzhou, China