Magnetic Structure of the Ischia volcanic island, Southern Italy
Magnetic Structure of the Ischia volcanic island, Southern Italy
复制标题
意大利南部伊斯基亚火山岛的磁力结构
DOI：
10.4401/ag-7550
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发表时间：
2017
影响因子：
1
通讯作者：
G. Florio
中科院分区：
文献类型：
--
作者：
V. Paoletti;M. Fedi;G. Florio
我们通过分析和解释高分辨率航磁数据以及新编译的陆地重力数据集，对伊斯基亚火山岛的结构进行了研究。通过相似分析对重力数据的垂直梯度和极点减少的磁数据进行了比较，并强调了熔岩和绿色凝灰岩沉积物（例如，Punta Imperatore、Mt. Trippodi、Zaro、Mt. Rotaro、Mt. Epomeo）上主要磁力和重力高点之间的对应关系。我们的分析还强调了该岛中部同时存在磁极小值和重力极大值，这主要在两个数据集的长周期分量中可见。这可能是由于存在具有正密度对比的部分消磁结构，代表该岛的火成岩基底。磁力和重力数据的总水平梯度图的最大值清楚地指出了该岛熔岩和凝灰岩沉积物的边界。这些最大值还显示了几条轮廓线的位置，与绘制的岛屿断层非常吻合。
We carried out a study of the structures of the volcanic island of Ischia by the analysis and interpretation of high-resolution aeromagnetic data and by a newly compiled in-land gravity data set. The comparison between the vertical gradient of gravity data and pole-reduced magnetic data was performed through semblance analysis and highlighted a correspondence between the main magnetic and gravity highs over the lava and green tuff deposits (e.g., Punta Imperatore, Mt. Trippodi, Zaro, Mt. Rotaro, Mt. Epomeo). Our analysis also highlighted the simultaneous presence of a magnetic minimum and a gravimetric maximum in the central part of the island, mainly visible in the long-period components of the two data sets. This may be due to the existence of a partially demagnetized structure with positive density contrast, representing the island's igneous basement. The boundaries of the lava and tuffs deposits of the island were clearly pointed out by the maxima of the total horizontal gradient maps of magnetic and gravity data. Those maxima also show the position of several lineaments, in good agreement with the mapped faults of the island.