Crustal structure of Iceland and Greenland from receiver function studies
Crustal structure of Iceland and Greenland from receiver function studies
复制标题
从接收函数研究冰岛和格陵兰岛的地壳结构
DOI：
10.1029/2005jb003991
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发表时间：
2007
影响因子：
--
通讯作者：
T. Dahl
中科院分区：
文献类型：
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作者：
Prakash Kumar;R. Kind;K. Priestley;T. Dahl
[1]我们使用冰岛和格陵兰岛永久和临时地震台网的数据，通过部分重新解释早期数据（P接收器函数）并添加S接收器函数来更好地约束结果，从而调查地壳厚度。我们得到了很好的转换莫霍面和地壳多次波在冰岛和格陵兰岛。格陵兰岛中部的冰层覆盖部分的地壳平均厚度为40公里，这是克拉通的典型厚度。在格陵兰岛的边缘，地壳厚度减少到30-40公里。在格陵兰岛东海岸，冰岛羽流的轨迹被认为影响了岩石圈，地壳厚度只有24-26公里。与以往的研究相比，我们发现，在冰岛东部和西北沿海地区的地壳厚度超过40公里，类似于下面的活火山区。在冰岛的西南地区和沿着大洋中脊，地壳厚度只有25公里或less. Also在早期的接收器功能的解释，推导出一个广泛的壳幔过渡带的冰岛，我们发现一个正常的，更尖锐的莫霍面下的一些网站的迹象。
[1] We used data from both permanent and temporary seismic networks on Iceland and Greenland to investigate the crustal thickness by partly reinterpreting earlier data (P receiver functions) and adding S receiver functions to better constrain the results. We obtained good conversions from the Moho and also crustal multiples in both Iceland and Greenland. The central ice covered part of Greenland has an average crustal thickness of 40 km, typical for a craton. At the edges of Greenland the crustal thickness decreases to 30–40 km. On the east coast of Greenland, where the track of the Iceland plume is thought to have affected the lithosphere, the crustal thickness is only 24–26 km. In contrast to previous studies, we find that the crustal thickness in the east and the northwest coastal regions of Iceland is more than 40 km, similar to beneath the active volcanic region. In the southwest region of Iceland and along the mid-ocean ridge, the crustal thickness is only 25 km or less. Also in contrast to earlier receiver function interpretations, which deduced a broad crust-mantle transition zone for Iceland, we find indications for a normal, sharper Moho beneath a number of sites.