globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228575
论文题名:
Constraints on the configuration of Andaman-Nicobar Subduction zone from EM modeling
作者: Anusha E.; Arora K.; Nagarajan N.; Azeez K.K.A.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 792
语种: 英语
中文关键词: Accretionary sediments ; Andaman-Nicobar subduction zone ; Conductivity structure ; Continental crust
英文关键词: Geophysics ; Physics ; Complex geometries ; Conductive bodies ; Electrical conductivity ; Electrical structures ; Forward computation ; Initial configuration ; Seismic reflection data ; Volcanic seamounts ; Barium compounds ; accretionary prism ; continental crust ; electrical conductivity ; fault zone ; magnetotelluric method ; plate tectonics ; seismic reflection ; subduction zone ; Andamans and Nicobars ; India ; Hepatitis A virus
英文摘要: The electrical conductivity structures, using Long period Magneto Telluric data at three sites: NBG (Nabagram) & HAV (Havelock) in Andaman and CBY (Campbell Bay) in Nicobar region are investigated. After obtaining 1D responses, 2D forward models of electrical structure are constructed along profiles across North Andaman, Middle Andaman and Nicobar Islands. The initial configuration along each profile is constrained from models based on seismic reflection data. The responses obtained after iterative forward computations match the observed data at respective sites reasonably well. New structures within the forearc high are discerned: from north to south we delineate a moderately conductive body beneath North Andaman, which is associated with the presence of ophiolites around this location, in the Middle Andaman, a highly conductive body below the island is interpreted as presence of fluids along the active Diligent Fault, facilitated by the barrier of the Invisible Bank. A complex geometry of resistive material embedded in a highly conductive body inferred beneath at Great Nicobar at CBY is commensurate with the presence of a layered magmatic body, possibly linked to the volcanic seamount to the east, near the tear of the subducting plate. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170540
Appears in Collections:气候变化与战略

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作者单位: CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India

Recommended Citation:
Anusha E.,Arora K.,Nagarajan N.,et al. Constraints on the configuration of Andaman-Nicobar Subduction zone from EM modeling[J]. Tectonophysics,2020-01-01,792
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