Fractal analysis of geomagnetic data to decipher pre-earthquake process in Andaman-Nicobar region, India

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Rahul Prajapati, Kusumita Arora
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引用次数: 0

Abstract

Abstract. The emission of seismo-electromagnetic (EM) signatures prior to earthquake recorded in geomagnetic data has potential to reveal the pre-earthquake processes in focal zones. This study focused to analysis of vertical component of a geomagnetic field from Mar 2019 to Apr 2020 using fractal and multifractal approach to identify the EM signatures in Campbell Bay, a seismically active region of Andaman and Nicobar, subduction zone. The significant enhancements in monofractal dimension and spectrum width components of multifractal highlights the high frequency with less and more complex nature of EM signatures preceded by earthquakes respectively, which indicates that the pre-earthquake processes on West Andaman Fault (WAF) and Andaman Trench (AT) are due to micro fracturing. Moreover, the significant enhancements in holder exponents, components of multifractal highlight the less correlated, smooth, and low frequency characteristics of EM signatures preceded by earthquakes, which indicate that pre-earthquake processes on Seulimeum Strand (SS) fault are due to electrokinetic processes. Thus, the mono fractal, spectrum width, and holder exponent parameter respond differently to the earthquakes with different characteristics, causing EM signatures to be observed with an average of 10, 12, and 20 days prior to the earthquakes respectively, which are also lies in range of short -term earthquake prediction.
对地磁数据进行分形分析,解读印度安达曼-尼科巴地区震前过程
摘要。地磁数据中记录的地震前地震电磁(EM)信号有可能揭示焦点区的震前过程。本研究重点分析了 2019 年 3 月至 2020 年 4 月地磁场的垂直分量,采用分形和多分形方法识别了俯冲带安达曼和尼科巴地震活跃地区坎贝尔湾的电磁特征。多分形的单分形维度和频谱宽度分量的明显增强分别凸显了地震前电磁特征的高频率、较低和较复杂的性质,这表明西安达曼断层(WAF)和安达曼海沟(AT)的震前过程是由微断裂引起的。此外,多分形的持有指数和分量的明显增强凸显了地震前电磁特征的低相关性、平滑性和低频率特性,这表明 Seulimeum Strand(SS)断层的震前过程是由电动力过程引起的。因此,单分形、频谱宽度和持指数参数对不同特征的地震做出了不同的响应,导致在地震前平均 10 天、12 天和 20 天分别观测到电磁特征,这也位于短期地震预测的范围之内。
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来源期刊
Nonlinear Processes in Geophysics
Nonlinear Processes in Geophysics 地学-地球化学与地球物理
CiteScore
4.00
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Nonlinear Processes in Geophysics (NPG) is an international, inter-/trans-disciplinary, non-profit journal devoted to breaking the deadlocks often faced by standard approaches in Earth and space sciences. It therefore solicits disruptive and innovative concepts and methodologies, as well as original applications of these to address the ubiquitous complexity in geoscience systems, and in interacting social and biological systems. Such systems are nonlinear, with responses strongly non-proportional to perturbations, and show an associated extreme variability across scales.
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