Anisotropy in the flexural response of the Indian Shield

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• 作者：Rajesh R. Nair^a ; ^{rajeshnair.iitkgp@gmail.com} ; Yudhvir Singh^a ; Deshraj Trivedi^b ; Suresh Ch. Kandpal^b
• 关键词：Elastic thickness ; Mechanical strength ; Mechanical anisotropy ; Indian Shield ; Hermite tapers
• 刊名：Tectonophysics
• 出版年：2012
• 期刊代码：82_00401951
• 类别：ear
• 出版时间：6 April, 2012
• 卷：532-535
• 期：Complete
• 页码：193-204
• 文件大小：1880 K

摘要

We seek to determine the strain field which has accumulated in the Indian Shield due to the continental drift of Gondwanaland. We have used a method which involves the calculation of the 2D isostatic coherence response function between Bouguer gravity and topography as a function of azimuth by way of multispectrogram analysis. The average coherence is maximum consistently in the Indian Shield in a direction, which is at an angle of 45掳 to the major trend of suture zones within the shield, a result which is in good agreement with the strain inferred from absolute plate motion (APM) in a hot spot reference frame. This directionality of mechanical plate weakness suggests that all paleostress fields were erased due to the movement of the Indian plate during the Himalayan orogeny.