Thickness of the central and eastern European lithosphere as seen by S receiver functions
Thickness of the central and eastern European lithosphere as seen by S receiver functions
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DOI：
10.1111/j.1365-246x.2010.04548.x
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发表时间：
2010-05-01
影响因子：
2.8
通讯作者：
Kind, Rainer
中科院分区：
文献类型：
--
作者：
Geissler, Wolfram H.;Sodoudi, Forough;Kind, Rainer
本文用欧洲78个永久宽带台站记录的地震图获得的P>S接收函数估算了欧洲岩石圈的厚度。我们的研究结果提供了新的，独立的信息下的岩石圈厚度的前寒武纪地台东欧和中欧的中生代地台。详细的高分辨率图像的岩石圈-软流圈边界（LAB）揭示了一个典型的大陆岩石圈约100公里的厚度下的大多数站在中欧的迹象，而在附近的跨欧洲缝合带（TESZ），岩石圈增厚到约130公里。在上莱茵河地堑区下方发现了一个80 km的相对较薄的岩石圈，表明新生代伸展作用影响了整个岩石圈。在阿尔卑斯山和喀尔巴阡山脉下没有探测到明显的LAB信号。LAB Sp阶段可能会受到这些地区正在进行的碰撞/俯冲造成的复杂结构的干扰，或者数据还不够密集。一个相对较厚的岩石圈约120公里的波希米亚地块的西南部，在华力西造山运动期间形成的下方被发现。我们发现了一个LAB深度约190公里附近的一个单一的站位于Vrancea地区/东喀尔巴阡山脉，其特点是发生中深地震。在位于东欧前寒武纪地台的台站下方，LAB加深到约> 200 km，尽管LAB的转换相不如位于中欧的其他台站下方的转换相那么尖锐，甚至缺失。
P>S receiver functions obtained from seismograms of teleseismic events recorded at 78 European permanent broad-band stations are used to estimate the thickness of the European lithosphere. Our results provide new, independent information about the lithospheric thickness beneath the Precambrian platform of Eastern Europe and the Phanerozoic platform of central Europe. Detailed high-resolution images of the lithosphere-asthenosphere boundary (LAB) reveal indications for a typical continental lithosphere of about 100 km thickness beneath a majority of stations within Central Europe, whereas in the vicinity of the Trans-European Suture Zone (TESZ), the lithosphere thickens to about 130 km. A relatively thin lithosphere of 80 km was found beneath the Upper Rhine Graben region suggesting that the Cenozoic extension affects the whole lithosphere. No clear signal from the LAB was detected beneath the Alps and Carpathians. The LAB Sp phase might be disturbed by complicated structure due to ongoing collision/subduction in these regions, or the data are not yet sufficiently dense. A relatively thicker lithosphere of about 120 km was found beneath the SW part of the Bohemian Massif that was formed during the Variscan orogeny. We found an LAB depth of about 190 km near a single station located in the Vrancea area/Eastern Carpathians, which is characterized by the occurrence of intermediate deep earthquakes. Beneath the stations located in the Precambrian platform of Eastern Europe, the LAB deepens to approximately > 200 km, even though the converted phase from the LAB is not as sharp as found beneath other stations located in Central Europe or even is missing.