基于赫斯特指数的青藏高原东北缘地震磁效应特征分析

doi:10.12196/j.issn.1000-3274.2023.04.008

Abstract

Abstract: Geomagnetic Z-component observations between 2012 and 2022 from 7 geomagnetic stations in the northeast of the Qinghai-Tibet Plateau, together with four seismic events, were selected to analyze the relationships between Hurst Exponent (H) values and seismic activities. Rescaled range analysis (R/S) and least square method (LSM) were used to calculate the Hurst Exponent (H) values. The results show that: ① H values of the geomagnetic Z-component from 7 geomagnetic stations located in the northeast of the Qinghai-Tibet Plateau, are ranged from 0.5 to 1.0 during the past 10 years, manifesting the characteristics of long-range correlation and persistence, which can be used to forecast the variation trends in the future. ② H values at 7 geomagnetic stations all decreased rapidly 1~3 months before the 4 earthquakes, till to below 0.5, and the deviation from the normal geomagnetic observations (0.5<H<1.0) indicates the occurrence of the geomagnetic anomalies. Epicenter distance and earthquake magnitude affect the occurrence probabilities of seismic-magnetic effects. The larger the magnitude and the smaller the epicentral distance are, the more obvious the seismomagnetic effects of the Hurst Exponent (H) values are. ③ The anti-persistence of the H may indicate the migration of deep crust-mantle heat flow. The upwelling of deep heat flow within the secondary plate of the Qinghai-Tibet Plateau, the lateral migration from the hinterland of the plateau to the periphery, as well as the existence of mantle heat uplift in Tianshui area, provide reference for exploring the seismogenic mechanism inside and around the northeastern margin of the Qinghai-Tibet Plateau block. The data analysis based on H can give more chance to capture and interpret seismomagnetic anomalies, supplement the research practice of earthquake cases, and explore the relationships between geomagnetic variations and seismic activities.

Key words: Geomagnetic Z-component, Hurst Exponent (H), Geomagnetic anomalies, Mantle heat flow

CLC Number:

P315.7

SU Shu-juan, YANG Yan-ming, ZOU Chun-hong, SUN Hao, ZHANG Yao-wen, ZHANG Zhen-han, JIA Zhen, WU Yang. Seismic Magnetic Effects in the Northeastern Margin of the Qinghai-Tibet Plateau Based on Hurst Exponent[J]. EARTHQUAKE, 2023, 43(4): 119-134.

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Seismic Magnetic Effects in the Northeastern Margin of the Qinghai-Tibet Plateau Based on Hurst Exponent

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