中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 岩石圈演化国家重点实验室
A New Method to Estimate Slab Dip Direction Using Receiver Functions and Its Application in Revealing Slab Geometry and a Diffuse Plate Boundary Beneath Sumatra

文献类型：期刊论文

作者Feng, Mingye1,2,3,5; Chen, Ling2,3; Wei, Shengji1,5; Wang, Xin4; Wang, Xu3; Wu, Zimu2
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2023-04-01
卷号128期号:4页码:21
ISSN号2169-9313
DOI10.1029/2022JB024598
英文摘要While dip direction is a fundamental parameter of slab geometry, it is rarely estimated quantitatively. Here, we develop a new method, Dip Direction Searching (DDS), of receiver functions (RFs) that reduces the uncertainty of slab dip direction estimation from tens to several degrees. DDS can also resolve the thickness and depth of a dipping structure. We then apply DDS to the RFs in the Sumatran subduction zone. Travel time differences of the converted phases from the upper and lower (oceanic Moho) boundaries of the dipping low-velocity layer (LVL) along the plate interface show a thickness of 10-14 km. The results also show increased dip direction of the slab Moho from 47 +/- 5.3 degrees in southern Sumatra to 70 +/- 10.7 degrees in northern Sumatra, indicating a complicated slab geometry and internal deformation along strike. Similar dip directions are obtained for the upper and lower LVL boundaries beneath Nias and Enggano forearc islands in the north and south, whereas we find a larger discrepancy of similar to 14-23 degrees beneath Siberut and Pagai in between. The thicker LVL with a non-negligible difference in the dip directions of its upper and lower bounds in the center of Sumatra is interpreted as a partially serpentinized mantle layer above the oceanic crust, forming a distinct channel atop the subducting slab. Our results provide basic observational constraints on the structure and geometry of the oceanic slab and associated subduction processes. Both synthetics and data analyses also indicate DDS can be applied in other subduction zones and for other dipping interfaces. Subducting plate boundary, between the oceanic and the continental plates, is key to understanding material and energy exchanges in the subduction factory and the associated geohazards. Seismic imaging reveals a dipping low-velocity layer (LVL) at the subducting plate boundary globally associated with megathrust earthquakes and arc magmatism, but the nature of the LVL remains hotly debated because of lacking strong constraints on its geometry and properties and regional comparisons. To partly fill the knowledge gap, we propose a Dip Direction Searching (DDS) method to detect the LVL, estimate the dip directions of its upper and lower boundaries, and constrain its depths and thickness based on seismic P-wave to S-wave converted phases. DDS is then applied to the Sumatra subduction zone as a case study, and an LVL is successfully detected with a large thickness (up to 14 km) than a normal oceanic crust (similar to 7 km). The dip directions of the upper and lower boundaries of the LVL differ by up to 23 degrees, suggesting a considerably irregular upper boundary. We interpret the LVL as the oceanic crust overlain by a low-velocity hydrated mantle layer, indicating a smeared/diffuse plate boundary caused by upward fluid migration and its resultant mantle serpentinization.
WOS关键词CRUSTAL SEISMIC ANISOTROPY ; OCEANIC-CRUST ; UPPER-MANTLE ; SOUTHERN CALIFORNIA ; TRAVEL-TIMES ; SUBDUCTION ; ZONE ; DEFORMATION ; CASCADIA ; VELOCITY
资助项目National Natural Science Foundation of China[42288201] ; Strategic Priority Research Program (A) of Chinese Academy of Sciences[XDA20070302] ; Singapore MOE tier-2 Grant[MOE2019-T2-1-182 (S)] ; Earth Observatory of Singapore ; National Research Foundation Singapore ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Chinese Scholarship Council for scholarship fund
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000964304300001
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Singapore MOE tier-2 Grant ; Singapore MOE tier-2 Grant ; Earth Observatory of Singapore ; Earth Observatory of Singapore ; National Research Foundation Singapore ; National Research Foundation Singapore ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Chinese Scholarship Council for scholarship fund ; Chinese Scholarship Council for scholarship fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Singapore MOE tier-2 Grant ; Singapore MOE tier-2 Grant ; Earth Observatory of Singapore ; Earth Observatory of Singapore ; National Research Foundation Singapore ; National Research Foundation Singapore ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Chinese Scholarship Council for scholarship fund ; Chinese Scholarship Council for scholarship fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Singapore MOE tier-2 Grant ; Singapore MOE tier-2 Grant ; Earth Observatory of Singapore ; Earth Observatory of Singapore ; National Research Foundation Singapore ; National Research Foundation Singapore ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Chinese Scholarship Council for scholarship fund ; Chinese Scholarship Council for scholarship fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Strategic Priority Research Program (A) of Chinese Academy of Sciences ; Singapore MOE tier-2 Grant ; Singapore MOE tier-2 Grant ; Earth Observatory of Singapore ; Earth Observatory of Singapore ; National Research Foundation Singapore ; National Research Foundation Singapore ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Singapore Ministry of Education under the Research Centres of Excellence initiative ; Chinese Scholarship Council for scholarship fund ; Chinese Scholarship Council for scholarship fund
源URL[http://ir.iggcas.ac.cn/handle/132A11/111342]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Chen, Ling; Wei, Shengji
作者单位1.Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Nanyang Technol Univ, Asian Sch Environm, Singapore, Singapore
推荐引用方式
GB/T 7714		 Feng, Mingye,Chen, Ling,Wei, Shengji,et al. A New Method to Estimate Slab Dip Direction Using Receiver Functions and Its Application in Revealing Slab Geometry and a Diffuse Plate Boundary Beneath Sumatra[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(4):21.
APA Feng, Mingye,Chen, Ling,Wei, Shengji,Wang, Xin,Wang, Xu,&Wu, Zimu.(2023).A New Method to Estimate Slab Dip Direction Using Receiver Functions and Its Application in Revealing Slab Geometry and a Diffuse Plate Boundary Beneath Sumatra.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(4),21.
MLA Feng, Mingye,et al."A New Method to Estimate Slab Dip Direction Using Receiver Functions and Its Application in Revealing Slab Geometry and a Diffuse Plate Boundary Beneath Sumatra".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.4(2023):21.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。