Magnetic anomalies of randomly magnetized finite-strike listric fault sources

IF 1.3 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Earth System Science Pub Date : 2024-08-05 DOI:10.1007/s12040-024-02358-4

M Deepak, B Ramamma, V Chakravarthi

引用次数: 0

Abstract

A generalized forward modelling equation to calculate the magnetic anomalies of a randomly magnetized finite-strike listric fault source is derived using Poisson's relation. This new equation combines both analytic and numeric approaches to realize forward modelling of the anomalous source in any component. Polynomial functions are adopted to simulate the geometry of the curved fault plane between the displaced hanging wall and the footwall of the fault morphology. The utility of the derived equation is epitomized with a theoretical model of a limited-strike listric fault morphology by computing the anomaly in the vertical, horizontal and total field components. It is demonstrated that the magnitude of the anomalous field (in any component) does not remain the same but changes with the profile offset, albeit the anomalous source remains the same. The effect of structure dimensionality (2D vs. 2^1/2D) on the magnitude of the anomalous field is also discussed.

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随机磁化有限条纹列状断层源的磁异常

利用泊松关系推导出一个通用的正向建模方程，用于计算随机磁化有限条纹列状断层源的磁异常。这一新方程结合了分析和数值方法，可实现对任何分量的异常源进行前向建模。采用多项式函数来模拟断层形态中移位的悬壁和底壁之间的弯曲断层面的几何形状。通过计算纵向、横向和总场分量的异常，以有限冲断列状断层形态的理论模型为例，体现了推导方程的实用性。结果表明，尽管异常源保持不变，但异常场（任何分量）的大小不会保持不变，而是会随着剖面偏移而变化。还讨论了结构维度（2D 与 21/2D）对异常场大小的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.20

自引率

5.30%

发文量

226

期刊介绍： The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.