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首页> 外文期刊>Journal of Asian earth sciences >New insights into the structural model of the Makran subduction zone by fusion of 3D inverted geophysical models
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New insights into the structural model of the Makran subduction zone by fusion of 3D inverted geophysical models

机译：通过融合3D倒置地球物理模型对Makran俯冲带构造模型的新见解

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摘要

Geological modeling by geophysical data in the Makran subduction zone is a challenging task which comes from its extreme structural and geological complexity. Different geological models were presented for this zone in previous studies by the use of various sources of information. Among these studies, numerous geophysical models were introduced to illustrate depth, geometry and location of the subduction zone and definition boundaries with adjacent zones. However, structural complexity of the media and high degree of variation in geological units reduce accuracy of geophysical model derivation. In this study, an integrated strategy via model fusion for geological model building of the Makran subduction zone was presented using gravity and magnetic data. In the presented strategy, gravity and magnetic models were integrated through fusing procedure. Herewith airborne magnetic and gravity data were inverted by fine gridding and solving large scale problems for each set of potential field data. While magnetic model inherently was able to reveal near surface structures, gravity data modeled large depth anomalies. Afterwards, a discrete wavelet transform rule was used for fusion magnetic and gravity models to derive a unique model containing advantage of both sets of data. The fused model revealed more detail of the Makran zone structure, location of the subduction zone and steep dip faults. The final models proposed depth of 40 km for the top of the oceanic crust with variation in thickness from 5 to 8 km, basin ward. The subduction zone located 200 km in the onshore and it shows a very low dip.
机译：通过Makran俯冲带的地球物理数据进行地质建模是一项具有挑战性的任务，这是因为其极端的结构和地质复杂性。在先前的研究中，通过使用各种信息来源，提出了该地区的不同地质模型。在这些研究中，引入了许多地球物理模型来说明俯冲带的深度，几何形状和位置以及与相邻带的定义边界。但是，介质的结构复杂性和地质单元的高度变化会降低地球物理模型推导的准确性。在这项研究中，利用重力和磁数据，提出了一种通过模型融合进行Makran俯冲带地质模型建立的综合策略。在提出的策略中，重力和磁性模型通过融合过程进行了集成。因此，通过精细网格反转机载磁性和重力数据，并解决了每组潜在场数据的大规模问题。磁性模型本来可以揭示近地表结构，而重力数据可以模拟大深度异常。然后，将离散小波变换规则用于融合磁和引力模型，以得出包含两个数据集优势的独特模型。融合模型揭示了Makran带构造，俯冲带位置和陡倾断层的更多细节。最终的模型建议洋壳顶部的深度为40 km，厚度为5至8 km（盆地区）。俯冲带位于陆上200公里处，其俯冲非常低。

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