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Curvature interpretation of gravity data for delineating structural features across the transition zone of Narmada–Son lineament in central India
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2020-06-18 , DOI: 10.1007/s12040-020-01402-3
G K Ghosh

Potential-field anomalies can be converted to a common function which describes the ridge, peaks over an isolated source. In this study, attempt has been made to interpret curvature attributes of equipotential surface using gravity gradients for delineating thrust–fault locations in one of the seismically active transition zones of Narmada–Son Lineament (NSL) in central India. The NSL is oriented in the ENE–WSW direction, divides the area into two geological provinces. The northern part of this NSL comprises Vindhyan formations and southern part covers Gondwana formations. It has been observed that, the northern part (around Jukehi) of the area has higher elevation with lower gravity anomaly and the southern part (around Khamaria and Kataria) has lower elevation with higher gravity anomaly. The tectonic activities like intrusions, volcanisms and earthquake occurrences were the sources of crustal resettlement during the past in this area. Various researchers commented about the structural configuration; however, the present study helps to understand the structural features using various curvature analysis like maximum, minimum, most-positive, most-negative, mean, dip (profile), strike (tangential), contour (plan), curvedness, shape index and Gaussian curvatures. Out of these curvatures most positive, maximum, mean, dip and curvedness show more effective results compared to other curvatures. However, shape index states domes, ridge, flat, valley, bowl shape type structures. The results are also correlated with the conventional horizontal gravity gradient, analytic signal and tilt derivative analysis. The colour contrast variation of these differential curvatures make in-depth understanding with extensive multiplicities of integrity for delineating subsurface structures.



中文翻译:

重力数据的曲率解释,以描绘印度中部纳尔默达–孙线的过渡带的构造特征

势场异常可以转换为一个通用函数,该函数描述脊,孤立源上的峰。在这项研究中,已尝试使用重力梯度来解释等势面的曲率属性,以描绘印度中部纳尔默达-松线(NSL)地震活跃过渡带之一的逆冲断层位置。NSL的方向是ENE–WSW,将区域划分为两个地质省份。该NSL的北部包括Vindhyan地层,南部包括Gondwana地层。已经观察到,该区域的北部(约克希附近)海拔较高,重力异常较小,而南部(Khamaria和Kataria周边)海拔较低,重力异常较高。入侵等构造活动,过去,火山和地震是该地区地壳重新安置的来源。许多研究人员评论了结构构造。但是,本研究有助于使用各种曲率分析来了解结构特征,例如最大,最小,最正,最负,均值,倾角(轮廓),走向(切线),轮廓(平面),弯曲度,形状指数和高斯曲率。与其他曲率相比,在这些曲率中,最正的,最大的,均值的,倾斜的和弯曲的显示更有效的结果。但是,形状索引指出了穹顶,山脊,平坦,山谷,碗形类型的结构。结果还与常规的水平重力梯度,分析信号和倾斜导数分析相关。

更新日期:2020-06-18
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