ABSTRACT

The NW Iberian margin is a hyperextended continental margin, formed during the opening of the North Atlantic Ocean, where a subsequent partial tectonic inversion has undergone during the Alpine Orogeny. This succession of tectonic episodes determines the magnetic signature of the margin. The Spanish Exclusive Economic Zone Project has carried out seven one-month cruises between 2001 and 2009. To extend and densify the spatial coverage, we have used data from the World Digital Magnetic Anomaly Map. Here, we describe the methodology used for the acquisition and data processing of the magnetic field data. The use of diverse instrumentation, a non-complete external field’s cancelation, and the use of different magnetic core field models, contributed to the total error budget. To reduce it, we have used a leveling algorithm which minimizes all these contributions. Finally, a statistical analysis was applied using crossover residuals, showing a resolution better than 28 nT.

摘要

伊比利亚西北缘是北大西洋开放期间形成的超伸展大陆边缘，随后在高山造山运动中发生了部分构造反转。这一系列的构造事件决定了边缘的磁性特征。西班牙专属经济区项目在2001年至2009年之间进行了7次为期1个月的巡游。为扩大和缩小空间范围，我们使用了世界数字磁异常图的数据。在这里，我们描述了用于磁场数据的采集和数据处理的方法。使用不同的仪器，不完整的外部磁场抵消以及使用不同的磁芯磁场模型，都为总误差预算做出了贡献。为了减少它，我们使用了一种使所有这些影响最小化的均衡算法。最后，使用交叉残差进行统计分析，显示分辨率优于28 nT。