Spatio-temporal distribution of earthquake occurrence in Eastern Himalaya and vicinity (26°N–31°N and 87°E–98°E) based on b-value and fractal dimension

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Applied Geophysics Pub Date : 2023-06-21 DOI:10.1007/s11770-022-0956-0

Krishna Tiwari Ram, Paudyal Harihar, Shanker Daya

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引用次数: 0

Abstract

This study investigates the spatial and temporal variation of fractal dimension and b-value for the eastern part of the Himalaya and adjoining area (26°N–31°N and 87°E–98°E). The analysis is carried out on the earthquake dataset of 1373 events (Mc = 4.0) by sliding window technique for the period 1964 to 2020. The region is divided into three sub regions A (87°E–92°E), B (92°E–94°E) and C (94°E–98°E). The b-value computed for the region A comprising eastern Nepal is smaller compared to other two regions which infers the possible high stress and asperities in the region. High spatial fractal dimension (D_c > 1.5) and low temporal fractal dimension (D_t < 0.31) are computed for the regions. High spatial fractal dimension may indicate that fractures generating earthquakes are approaching a 2D structure and low temporal fractal dimension implies high clustering of earthquake’s epicenters. The b value shows a weak negative correlation with Dc for regions A and C while a weak positive correlation is observed for the region B. Based on b-value and fractal dimension, this study explains the frequency of earthquakes and heterogeneity of the seismogenic structure in this part of the Himalaya.

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基于b值和分形维数的东喜马拉雅及其附近地区(26°N - 31°N和87°E - 98°E)地震发生时空分布

本文研究了喜马拉雅东部及邻近地区(26°N - 31°N, 87°E - 98°E)分形维数和b值的时空变化特征。利用滑动窗口技术对1964 ~ 2020年1373次地震(Mc = 4.0)数据集进行了分析。该地区分为A(87°E - 92°E)、B(92°E - 94°E)和C(94°E - 98°E)三个子区。与其他两个地区相比，包括尼泊尔东部的A地区计算的b值较小，这推断出该地区可能存在高应力和岩石。高空间分形维数(Dc >1.5)和低时间分形维数(Dt <0.31)为区域计算。高的空间分形维数可能表明发生地震的裂缝接近二维结构，低的时间分形维数意味着震中高度聚集。a、C地区的b值与Dc呈弱负相关，b地区的b值与Dc呈弱正相关，本文利用b值和分形维数解释了喜马拉雅这一地区的地震频率和孕震构造的非均质性。

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

Applied Geophysics 地学-地球化学与地球物理

CiteScore

1.50

自引率

14.30%

发文量

912

审稿时长

2 months

期刊介绍： The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.