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Advances in Earth Science  2019, Vol. 34 Issue (3): 288-294    DOI: 10.11867/j.issn.1001-8166.2019.03.0288
    
Quality Evaluation of Offshore Data in the Earth Magnetic Anomaly Grid(2-arc-Minute Resolution)Taking the Southern Section of the Kolbeinsey Ridge in the Arctic Region as an Example
Chunguan Zhang(),Xiang Li,Bingqiang Yuan,Lijun Song
1. School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
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Abstract  

In order to evaluate the quality of the offshore magnetic data in the Earth Magnetic Anomaly Grid (2-arc-minute resolution)(EMAG2), the authors chose the aeromagnetic data at 1∶500 000 and 1∶1 000 000 scales of the southern section of the Kolbeinsey Ridge with a total area of 193 500 km2 to compare and analyze. Based on the EMAG2 data, the authors obtained the EMAG2 (downward continuation 4 km) and the aeromagnetic anomaly (upward continuation 4 km) using the analytical continuation method. Then, the correlation coefficients between the aeromagnetic anomaly (upward continuation 4 km) and the EMAG2, and the aeromagnetic anomaly and the EMAG2 (downward continuation 4 km) were calculated by the correlation analysis method. Finally, through comprehensive analysis of the features of these correlation coefficients and differences, the quality of the magnetic data of the southern section of the Kolbeinsey Ridge was evaluated in the database EMAG2. The results showed that the EMAG2 integrated a large number of the airborne or offshore magnetic data. The quality of the offshore magnetic data is relatively high in the offshore areas with dense lines. However, the quality of the offshore magnetic data is relatively low if the EMAG2 data at 4 km altitude is converted to the anomaly data at sea level.

Key words:  Quality evaluation      Offshore data      Earth Magnetic Anomaly Grid (2-arc-minute resolution)      Southern section of the Kolbeinsey Ridge      Arctic region.     
Received:  25 September 2018      Published:  28 April 2019
ZTFLH:  P318.6+3  
Fund: The project supported by the Natural Science Basic Research Plan in Shaanxi Province of China “Tectonic attribute of basin basement of the Northeastern Xinjiang: Constraint of geophysical data”(No. 2017JM4007);The China Geological Survey Project “Study on the geological structure features of the 21st Century Maritime Silk Road”(No. DD20160227)
About author:  Zhang Chunguan(1981-), male, Yudu County, Jiangxi Province, Associate professor. Research areas include integrated geophysical exploration and tectonophysics. E-mail:chunguan-zhang@163.com|Zhang Chunguan(1981-), male, Yudu County, Jiangxi Province, Associate professor. Research areas include integrated geophysical exploration and tectonophysics. E-mail:chunguan-zhang@163.com
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Chunguan Zhang
Xiang Li
Bingqiang Yuan
Lijun Song

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Chunguan Zhang,Xiang Li,Bingqiang Yuan,Lijun Song. Quality Evaluation of Offshore Data in the Earth Magnetic Anomaly Grid(2-arc-Minute Resolution)Taking the Southern Section of the Kolbeinsey Ridge in the Arctic Region as an Example. Advances in Earth Science, 2019, 34(3): 288-294.

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http://www.adearth.ac.cn/EN/10.11867/j.issn.1001-8166.2019.03.0288     OR     http://www.adearth.ac.cn/EN/Y2019/V34/I3/288

Fig. 1  The map of seafloor topography and distribution of aeromagnetic survey lines in the southern section of the Kolbeinsey Ridge
Fig. 2  The map of magnetic anomaly (4 km altitude) and data comparison in the southern section of the Kolbeinsey Ridge
Fig. 3  The map of magnetic anomaly (sea level) and data comparison in the southern section of the Kolbeinsey Ridge
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