Fractal Analysis of VLF Electric Field Changes Observed at Mathura in Relation to Moderate Shallow Earthquakes (M = 4.9–5.6, depth < 17 Km) Happened in India and Around

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geomagnetism and Aeronomy Pub Date : 2025-01-09 DOI:10.1134/S0016793224601005

Raj Pal Singh, Sarita Sharma, Devbrat Pundhir

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Abstract

Fractal analysis of VLF electric field data obtained by using vertical antenna located at Chaumuhan, Mathura station (Lat., 27.5° N, Long., 72.68° E) has been carried out using Higuchi method for investigating the impact of moderate shallow earthquakes (M = 4.9–5.6, depth 4.44–16.7 Km) that occurred during February 1, 2016 to October 31, 2016 (excluding April 2016) on the fractal dimension of VLF data. The results of the analysis show that daily values of fractal dimension vary much above and below the monthly mean during the period of observations, 1–30 days before and 1–30 days after the onset of the quakes considered in the present study. The ranges of reductions and enhancements in fractal dimension from the monthly mean are 0.05–0.33 and 0.054–0.43 respectively while the percentage ranges of reductions and enhancements in its daily variation are 3.0–23.21 and 2.81–19.88% respectively. The observed variations in fractal dimension have also been studied in the light of other expected sources like, magnetic storms, lightning activity, local building noises, and instrumental errors which may affect the fractal dimension of the VLF data. It is noticed that the observed variations of fractal dimensions do not correspond to these spurious sources considered. Further, model describing the genesis of VLF emissions in preparatory zones of the impending seismic events and their mechanism of transmission to the observing station have also been discussed.

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印度及周边地区中浅地震（M = 4.9 ~ 5.6，深度< 17 Km）对马图拉VLF电场变化的分形分析

马图拉Chaumuhan站垂直天线VLF电场数据的分形分析。， 27.5°N，长利用Higuchi方法研究了2016年2月1日至2016年10月31日（不含2016年4月）发生的中浅地震（M = 4.9 ~ 5.6，深度4.44 ~ 16.7 Km）对VLF数据分形维数的影响。分析结果表明，在地震发生前1 ~ 30天和地震发生后1 ~ 30天，分形维数的日值在月平均值上下变化很大。分形维数与月平均值相比降低和增强的幅度分别为0.05 ~ 0.33和0.054 ~ 0.43，日变化的百分比分别为3.0 ~ 23.21和2.81 ~ 19.88%。在其他可能影响VLF数据分形维数的因素如磁暴、闪电活动、局部建筑噪声和仪器误差的影响下，对观测到的分形维数变化也进行了研究。值得注意的是，观察到的分形维数的变化与所考虑的这些伪源并不相符。此外，本文还讨论了即将发生的地震事件预备区VLF辐射的成因模型及其向观测站传输的机制。

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

Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.