地球磁异常EMAG2v3与全球重力数据库V29数据质量综合评估——以北极地区Aegir脊为例

doi:10.11720/wtyht.2023.1558

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Abstract

To evaluate the qualities of the marine magnetic data in the Earth magnetic anomaly grid EMAG2v3 and the marine gravity data in global gravimetric database V29, this study selected the magnetic and gravity data of the Aegir axial rift and its adjacent areas within a range of about 150 km from EMAG2v3 and V29, respectively to conduct comparative research. This study systematically collected the anomaly data of the study area from EMAG2v3 and V29 for comparison with the measured gravity and magnetic data of the study area. First, this study gridded and whitened the EMAG2v3 data, V29 data, and measured gravity and magnetic anomaly data to obtain the corresponding images. Then, this study analyzed the correlations between the EMAG2v3 data and the shipborne magnetic data and between the V29 data and the shipborne gravity data, obtaining the magnetic and gravity correlation diagrams and corresponding correlation coefficients. By comparing the correlation coefficients and differences between the two kinds of magnetic data and the two kinds of gravity data, this study conducted an integrated evaluation of magnetic the gravity data of the study area from EMAG2v3 and V29, respectively. As indicated by the results, EMAG2v3 incorporates many shipborne magnetic data, with the shipborne magnetic anomaly data showing higher quality than the data from the EMAG2v3 for areas with dense survey lines. The results also show that the shipborne gravity anomalies showed roughly the same variations as those from V29, indicating the same lateral resolution of the two types of anomaly data.

Key words： data quality evaluation gravimetric database V29 Earth's magnetic anomaly grid EMAG2v3 shipborne magnetic force shipborne gravity

Received: 22 November 2022 Published: 23 January 2024

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	Mian ZHANG
	Chun-Guan ZHANG
	Min ZHAO
	Zhen-Hua ZHONG
	Bing-Qiang YUAN
	Lei ZHOU
	Mei HAN

Cite this article:

Mian ZHANG,Chun-Guan ZHANG,Min ZHAO, et al. An integrated data quality evaluation of Earth magnetic anomaly grid EMAG2v3 and global gravimetric database V29: A case study of the Aegir ridge in the Arctic[J]. Geophysical and Geochemical Exploration, 2023, 47(6): 1410-1416.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1558 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I6/1410

The seafloor topography and the distribution of gravity survey lines (a) and magnetic survey lines (b) in the Aegir axis rift

Aegir axis rift magnetic anomaly and data comparison
a—aeromagnetic anomaly; b—Earth magnetic anomaly grid(EMAG2v3); c—correlation coefficient between aeromagnetic anomaly and EMAG2v3; d—difference between aeromagnetic anomaly and EMAG2v3; e—line magnetic anomaly and difference of measurement A; f—line magnetic anomaly and difference of measurement B

Correlation coefficient value and difference interval of magnetic force

Aegir axis rift gravity anomaly and data comparison
a—ship-measured gravity anomaly; b—Earth gravity anomaly (V29); c—correlation coefficient between ship-measured gravity anomaly and Earth gravity anomaly (V29); d—difference between ship-measured gravity anomaly and Earth gravity anomaly (V29); e—line A gravity anomaly and difference; f—line B gravity anomaly and difference

Correlation coefficient value and difference interval of gravity

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