naa a22 4500 510753973 CHVBK 20180411083115.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s13131-013-0393-2 doi (NATIONALLICENCE)springer-10.1007/s13131-013-0393-2 Seismic phases from the Moho and its implication on the ultraslow spreading ridge [Elektronische Daten] [Jiazheng Zhang, Minghui Zhao, Xuelin Qiu, Jiabiao Li, Aiguo Ruan] The Moho interface provides critical evidence for crustal thickness and the mode of oceanic crust accretion. The seismic Moho interface has not been identified yet at the magma-rich segments (46°-52°E) of the ultraslow spreading Southwestern Indian Ridge (SWIR). This paper firstly deduces the characteristics and domains of seismic phases based on a theoretical oceanic crust model. Then, topographic correction is carried out for the OBS record sections along Profile Y3Y4 using the latest OBS data acquired from the detailed 3D seismic survey at the SWIR in 2010. Seismic phases are identified and analyzed, especially for the reflected and refracted seismic phases from the Moho. A 2D crustal model is finally established using the ray tracing and travel-time simulation method. The presence of reflected seismic phases at Segment 28 shows that the crustal rocks have been separated from the mantle by cooling and the Moho interface has already formed at zero age. The 2D seismic velocity structure across the axis of Segment 28 indicates that detachment faults play a key role during the processes of asymmetric oceanic crust accretion. The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg, 2013 Moho interface nationallicence seismic phases nationallicence ultra-slow spreading ridge nationallicence 2D crustal structure nationallicence Southwestern Indian Ridge (SWIR) nationallicence Zhang Jiazheng Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut Zhao Minghui Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut Qiu Xuelin Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut Li Jiabiao The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Ruan Aiguo The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 75-86 0253-505X 32:12<75 2013 32 13131 https://doi.org/10.1007/s13131-013-0393-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13131-013-0393-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Jiazheng Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut NATIONALLICENCE 700 1- Zhao Minghui Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut NATIONALLICENCE 700 1- Qiu Xuelin Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China aut NATIONALLICENCE 700 1- Li Jiabiao The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Ruan Aiguo The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 773 0- Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 75-86 0253-505X 32:12<75 2013 32 13131 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer