地球磁异常(
  <strong>EMAG2</strong>)数据中海域资料质量评估

doi:10.11867/j.issn.1001-8166.2019.03.0288

地球科学进展 ›› 2019, Vol. 34 ›› Issue (3): 288 -294. doi: 10.11867/j.issn.1001-8166.2019.03.0288

地球磁异常( EMAG2)数据中海域资料质量评估

张春灌(

),李想,袁炳强,宋立军

1. 西安石油大学地球科学与工程学院，陕西西安 710065

收稿日期:2018-09-25 修回日期:2019-02-15 出版日期:2019-03-10
基金资助:
陕西省自然科学基础研究计划资助项目“新疆东北部盆地基底构造属性的地球物理约束”(编号：2017JM4007);中国地质调查局项目“21世纪海上丝绸之路区域地质构造特征研究”(编号：DD20160227)

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

Received:2018-09-25 Revised:2019-02-15 Online:2019-03-10 Published:2019-04-28
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
Supported by:
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)

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为了评估地球磁异常(EMAG2)数据中海域资料的质量问题，选择Kolbeinsey脊南段地区约193 500 km²的1∶500 000及1∶1 000 000的航磁数据进行对比分析。基于地球磁异常(EMAG2)数据，利用解析延拓方法获得了EMAG2(向下延拓4 km)及航磁异常(向上延拓4 km)。利用相关分析法对EMAG2与航磁异常(向上延拓4 km)、EMAG2(向下延拓4 km)与航磁异常进行相关分析，得到了相应的相关系数。通过对这些数据之间相关系数及差值特征的综合分析，评估了EMAG2数据中Kolbeinsey脊南段地区磁力数据的质量。研究结果表明，EMAG2数据融合了大量海域航空磁测及海洋磁测资料，在测线较密的海域，其数据质量相对较高。然而若将4 km高度的EMAG2数据换算到海平面高度的异常数据，其数据质量较低。

关键词: 质量评估, 海域数据, 地球磁异常（EMAG2）, Kolbeinsey脊南段, 北极地区

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.

中图分类号:

P318.6+3

图1 Kolbeinsey脊南段海底地形及航磁测线分布图

Fig. 1 The map of seafloor topography and distribution of aeromagnetic survey lines in the southern section of the Kolbeinsey Ridge

图2 Kolbeinsey脊南段磁力异常(4 km高度)及数据对比图

Fig. 2 The map of magnetic anomaly (4 km altitude) and data comparison in the southern section of the Kolbeinsey Ridge

图3 Kolbeinsey脊南段磁力异常(海平面)及数据对比图

Fig. 3 The map of magnetic anomaly (sea level) and data comparison in the southern section of the Kolbeinsey Ridge

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