DOI: 10.1038/ngeo2760
论文题名: Locked and loading megathrust linked to active subduction beneath the Indo-Burman Ranges
作者: Steckler M.S. ; Mondal D.R. ; Akhter S.H. ; Seeber L. ; Feng L. ; Gale J. ; Hill E.M. ; Howe M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 8 起始页码: 615
结束页码: 618
语种: 英语
Scopus关键词: accretionary prism
; GPS
; plate boundary
; plate convergence
; plate tectonics
; subduction zone
; thrust fault
; Bangladesh
; Ganges Delta
; India
; Indo-Burma
; Myanmar
英文摘要: The Indo-Burman mountain ranges mark the boundary between the Indian and Eurasian plates, north of the Sumatra-Andaman subduction zone. Whether subduction still occurs along this subaerial section of the plate boundary, with 46 mm yr -1 of highly oblique motion, is contentious. About 21 mm yr -1 of shear motion is taken up along the Sagaing Fault, on the eastern margin of the deformation zone. It has been suggested that the remainder of the relative motion is taken up largely or entirely by horizontal strike-slip faulting and that subduction has stopped. Here we present GPS measurements of plate motions in Bangladesh, combined with measurements from Myanmar and northeast India, taking advantage of a more than 300 km subaerial accretionary prism spanning the Indo-Burman Ranges to the Ganges-Brahmaputra Delta. They reveal 13-17 mm yr -1 of plate convergence on an active, shallowly dipping and locked megathrust fault. Most of the strike-slip motion occurs on a few steep faults, consistent with patterns of strain partitioning in subduction zones. Our results strongly suggest that subduction in this region is active, despite the highly oblique plate motion and thick sediments. We suggest that the presence of a locked megathrust plate boundary represents an underappreciated hazard in one of the most densely populated regions of the world. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105952
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States; School of Earth and Environmental Sciences, Queens College, City University of New York, Flushing, NY, United States; Earth and Environmental Sciences, Graduate Center, City University of New York, New York, NY, United States; Department of Geology, Dhaka University, Dhaka, Bangladesh; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore
Recommended Citation:
Steckler M.S.,Mondal D.R.,Akhter S.H.,et al. Locked and loading megathrust linked to active subduction beneath the Indo-Burman Ranges[J]. Nature Geoscience,2016-01-01,9(8)