DOI: 10.1002/2016GL068590
论文题名: Seismic evidence for tearing in the subducting Indian slab beneath the Andaman arc
作者: Kumar P. ; Srijayanthi G. ; Ravi Kumar M.
刊名: Geophysical Research Letters
ISSN: 0094-9694
EISSN: 1944-9425
出版年: 2016
卷: 43, 期: 10 起始页码: 4899
结束页码: 4904
语种: 英语
英文关键词: Andaman-Nicobar Islands
; lithosphere
; receiver functions
; subduction zone
; tear
Scopus关键词: Seismology
; Shear flow
; Shear waves
; Structural geology
; Andaman-Nicobar Islands
; Lithosphere
; Receiver functions
; Subduction zones
; Tear
; Tectonics
英文摘要: Segmentation of a subduction zone through tearing is envisaged as an inevitable consequence of the differential rate of slab rollback along the strike of convergent plate boundaries. It is a key feature that controls plate tectonics and seismogenesis in a subduction setting. Globally, lithospheric tears are mostly recognized by seismic tomography and seismicity trends. However, such an intriguing feature has never been imaged with high resolution. Here we present seismological evidence for tearing of the Indian oceanic plate at shallow depths along the Andaman arc. Our image of the subducted plate using the shear-wave receiver function technique reveals three distinct plate segments. The middle lithospheric chunk has an abrupt offset of ~20 km relative to the northern and southern segments along the entire stretch of Andaman-Nicobar Islands. We interpret that this abrupt offset in the base of the lithosphere is caused by the tearing of the subducted oceanic plate. For the plate age of ~80 to 60 Myr, the lithospheric thickness varies from ~40 to 70 km. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84970983931&doi=10.1002%2f2016GL068590&partnerID=40&md5=f70c5812dfb0fa44d54d39453bc035b5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10657
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: CSIR-National Geophysical Research Institute, Hyderabad, India
Recommended Citation:
Kumar P.,Srijayanthi G.,Ravi Kumar M.. Seismic evidence for tearing in the subducting Indian slab beneath the Andaman arc[J]. Geophysical Research Letters,2016-01-01,43(10).