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Multi-scale envelope-based analysis of geomagnetic anomaly field

Chen Mengtao, Chen Guoxin, Yang Wencai

Acta Geophysica

2023

Vol. 71, no. 1

65--78

This paper introduces a news processing method for geomagnetic anomaly field data: envelope mode magnetic field, which can weaken the influence caused by geomagnetic polarity reversal during rock magnetization, reflect the magnetic change of crustal rocks, and locate the crustal structures. According to the characteristics of the magnetic anomaly field, the envelope mode magnetic field is calculated in three different ways: full anomaly envelope, positive anomaly envelope, and negative anomaly envelope. The simulation test of seismic signal and magnetic anomaly model has achieved good results. During the calculation of the real-world data, because the magnetization directions of the geomagnetic field in the southern and northern hemispheres are opposite, we use the full envelope or positive envelope method for the northern hemisphere and the negative envelope method for the southern hemisphere. The experiment using EMAG2 global satellite magnetic anomaly data demonstrates that the strong anomaly of the envelope mode magnetic field is consistent with the spatial distribution of cratonic tectonic units, confirming its application effect.

Scratch recognition and analysis of gravity field in Chinese continent

Sun Yanyun, Yang Wencai, Zeng Xiangzhi, Zhao Tingyan, Zhang Wan, Zhang Xuanjie, Zhang Jiahong

Acta Geophysica

2022

Vol. 70, no 5

2001--2012

Applying the scratch recognition method to regional gravity fields, we defend the ridge and edge coefficient for delineation of the deformation belts and the tectonic boundaries, which are able to recognize characteristic parameters about crustal scratches contained in regional gravity field. The tests on theoretical models prove that our method is correct and applicable. After performing this procedure to Bouguer gravity field of Chinese continent, we obtain the resulting scratch maps for locating the crustal deformation belts. Finally, by comparing the known deformation belts in Chinese continent with these crustal scratches, we try to find the correlation between these scratches and the Phanerozoic crustal deformation belts. Comparison between the calculated crustal scratches and different types of deformation belts in Chinese continent shows that the strong and long scratches are correlated with most of mature plate collisional zones, strike-slip fault zones and large crustal detachments in Phanerozoic, which have been found by Chinese geologists. Thus, the scratch procedure is meaningful for recognizing the crustal deformation belts and useful for locating tectonic boundaries. However, young and active deformation faults are usually correlated with rather weak scratches as they are not mature enough.