喜马拉雅山脉西北部喜马拉雅主脉的侧向导电率变化:三维磁层前向建模的启示

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
S. Dhamodharan , Khasi Raju , Prasanta K. Patro
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引用次数: 0

摘要

了解喜马拉雅山脉主推山(MHT)几何形状的弧线平行变化与了解喜马拉雅山脉的弧线垂直变化同样重要。喜马拉雅主推山的几何变化对大地震和强地震的发生具有重要影响。通过三维磁测(MT)前向建模,可以研究喜马拉雅山西北部 MHT 沿线的潜在地壳模型。利用三维正演建模代码 MTD3FWD 计算了 MT 阻抗张量。先前建立的喜马拉雅山西北部不同地段的 MT 电阻率和地震速度模型被用作生成三维正演建模所需的电阻率网格的输入。通过三维正演计算得出的阻抗张量与原始公布的 MT 数据进行了交叉对比,以验证其准确性。三维正演模型还推导出了沿亚喜马拉雅和小喜马拉雅地区的横向电阻率截面,以研究横向异质性。横向电阻率截面显示了地壳内部的显著异质性,既有高电阻率结构,也有低电阻率结构,还可能存在沿 MHT 的横向斜坡。横向 MHT 的几何形状显示,在喜马拉雅山西北部的喜马偕尔地段有一个逐渐倾斜的斜坡,而在 Garhwal 和 Kumaun 地段则有一个陡峭的斜坡。研究区域下方的地壳结构呈现出明显的近乎垂直的电阻和导电特征。因此,受地下断层和山脊网络的影响,该地区的地壳具有相当大的异质性。德里哈里瓦尔海脊具有很高的电阻率,在决定 MHT 的横向倾角和控制该地区地震活动模式方面发挥着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Lateral electrical conductivity variations along the Main Himalayan thrust in the northwestern Himalayas: Insights from 3D Magnetotelluric forward modeling

Lateral electrical conductivity variations along the Main Himalayan thrust in the northwestern Himalayas: Insights from 3D Magnetotelluric forward modeling

Understanding the arc parallel variation on the geometry of the Main Himalayan Thrust (MHT) is as important as understanding the arc perpendicular variation in the Himalayas. The geometric variability of the MHT holds significant implications for the occurrence of major and great earthquakes. Three-dimensional magnetotelluric (MT) forward modeling enables the investigation of potential crustal models along the MHT in northwest Himalayas. MT impedance tensors were computed utilizing the 3D forward modeling code MTD3FWD. Previously established MT resistivity and seismic velocity models from various sectors of the northwestern Himalayas were employed as inputs for generating the resistivity mesh necessary for 3D forward modeling. The computed impedance tensors by 3D forward computation were cross-referenced with the original published MT data to validate their accuracy. A lateral resistivity cross section is also derived from the 3D forward model along the sub-Himalaya and lesser-Himalaya region to study the lateral heterogeneity. The lateral resistivity cross-section reveals significant heterogeneity within the crust, marked by both high and low-resistive structures and a possible lateral ramp along the MHT. The geometry of the lateral MHT showcases a gradual incline within the Himachal sector and a steep ramp within the Garhwal and Kumaun sectors in the northwestern Himalayas. The crustal architecture exhibits distinct nearly-vertical resistive and conductive features beneath the study area. Consequently, the crust within this region is characterized by considerable heterogeneity, influenced by a network of subsurface faults and ridges. The Delhi Haridwar Ridge, which exhibits high resistivity, plays a significant role in dictating the lateral dip of the MHT and exerting control over seismic activity patterns in the region.

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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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