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学科主题: Oceanography
题名: Seismic phases from the Moho and its implication on the ultra-slow spreading ridge
作者: [Zhang Jiazheng ; Zhao Minghui ; Qiu Xuelin] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Li Jiabiao ; Ruan Aiguo] State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China ; [Zhang Jiazheng] Univ Acad Sci, Beijing 100049, Peoples R China
通讯作者: mhzhao@scsio.ac.cn
关键词: Moho interface ; seismic phases ; ultra-slow spreading ridge ; 2D crustal structure ; Southwestern Indian Ridge (SWIR)
刊名: ACTA OCEANOLOGICA SINICA
发表日期: 2013
卷: 32, 期:12, 页:75-86
部门归属: 海洋地质
资助者: Foundation item: The National Natural Science Foundation of China under contract Nos 41176053, 41076029, 91028002 and 41176046; Dayang 115 under contract No. DYXM-115-02-3-01.
摘要: 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 degrees-52 degrees E) of the ultra-slow 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.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000328528400010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11093
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Zhang Jiazheng; Zhao Minghui; Qiu Xuelin] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Li Jiabiao; Ruan Aiguo] State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China; [Zhang Jiazheng] Univ Acad Sci, Beijing 100049, Peoples R China.Seismic phases from the Moho and its implication on the ultra-slow spreading ridge,ACTA OCEANOLOGICA SINICA,2013,32(12):75-86
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