地磁低点位移内源场分布特征

doi:10.12196/j.issn.1000-3274.2023.02.010

Abstract

Abstract: This article uses the method of rectangular harmonic analysis (RHA) to separate the internal and external source fields of the geomagnetic low point displacement anomaly that occurred in the southern region of the north-south seismic belt in China. It analyzes the ratio of the amplitude of the internal and external source fields during the distortion anomaly period to its diurnal amplitude. It is found that during the geomagnetic low point displacement anomaly period, the ratio of the amplitude of the internal field change to its diurnal amplitude is higher than the ratio of the amplitude of the external field change to its diurnal amplitude. During the period of geomagnetic low point displacement anomaly, the amplitude of internal field change is greater than that of external field change, indicating that the geomagnetic low point displacement anomaly comes from internal field.

Key words: The method of rectangular harmonic analysis, Geomagnetic lowest shift phenomenon, Internal geomagnetic field, External geomagnetic field

CLC Number:

P315.7

SUN Jun-song, WU Ying-yan, LI Hong-yu, TAN Jie-yu, YANG Jie. Distribution Characteristics of Geomagnetic Lowest Shift Phenomenon Internal Field[J]. EARTHQUAKE, 2023, 43(2): 120-130.

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Distribution Characteristics of Geomagnetic Lowest Shift Phenomenon Internal Field

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