The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods

The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods
复制标题

不同地震方法下沃格特兰/西波希米亚地区壳幔转变和莫霍面

DOI:
10.1007/s11200-009-0018-6
复制
发表时间:
2009
影响因子:
0.9
通讯作者:
Geissler
Geissler
中科院分区:
地球科学4区
文献类型:
--
作者:
Hrubcova;Geissler

文献摘要

参考文献

被引文献

相似文献

从陡角反射地震研究开始,Vogtland/西波希米亚地区的地壳结构和壳幔边界在过去25年里一直是几次地震测量的目标(DEKORP-4/KTB,MVE-90,9 HR),折射和广角实验(GRANU'95,CELEBRATION 2000,SUDETES 2003),然后进行被动地震研究(接收器功能,地震层析成像)。陡角反射研究成像了反射率高的下地壳(4至6公里厚),莫霍面解释深度在30至32公里之间,埃格裂谷下面的地壳较薄。折射和广角反射地震研究(CELEBRATION,2000年)显示,在被解释为下地壳顶部的26-28公里深处有强烈的广角反射。这些反射的长尾波表明下地壳层的反射率很强,这是加里东和华力西地区经常观察到的现象。接收函数研究发现,地壳底部发生了一次强烈的转换,解释为莫霍面不连续,深度在27至37公里之间(平均约31公里)。莫霍面深度测定结果的差异部分可归因于方法背景和分辨率的不同,但不能完全解释。从而提供了新的接收机函数模型。结果表明,观测结果可以用最大厚度为5 km的下地壳层或壳幔过渡带来解释,而不是一级莫霍面不连续。随后的合成射线追踪建模产生了下地壳顶部位于28公里处的模型,其中高反射下地壳层可以掩盖32-33公里深度处的莫霍面反射。
The structure of the crust and the crust-mantle boundary in the Vogtland/West Bohemian region have been a target of several seismic measurements for the last 25 years, beginning with the steep-angle reflection seismic studies (DEKORP-4/KTB, MVE-90, 9HR), the refraction and wide-angle experiments (GRANU’95, CELEBRATION 2000, SUDETES 2003), and followed by passive seismic studies (receiver functions, teleseismic tomography). The steep-angle reflection studies imaged a highly reflective lower crust (4 to 6 km thick) with the Moho interpreted in a depth between 30 and 32 km and a thinner crust beneath the Eger Rift. The refraction and wide-angle reflection seismic studies (CELEBRATION 2000) revealed strong wide-angle reflections in a depth of 26–28 km interpreted as the top of the lower crust. Long coda of these reflections indicates strong reflectivity in the lower crustal layer, a phenomenon frequently observed in the Caledonian and Variscan areas. The receiver function studies detected one strong conversion from the base of the crust interpreted as the Moho discontinuity at a depth between 27 and 37 km (average at about 31 km). The discrepancies in the Moho depth determination could be partly attributed to different background of the methods and their resolution, but could not fully explain them. So that new receivers function modelling was provided. It revealed that, instead of a first-order Moho discontinuity, the observations can be explained with a lower crustal layer or a crust-mantle transition zone with a maximum thickness of 5 km. The consequent synthetic ray-tracing modelling resulted in the model with the top of the lower crust at 28 km, where highly reflective lower crustal layer can obscure the Moho reflection at a depth of 32–33 km.
西波希米亚/沃格特兰主震区2000年后群微地震活动:时空分布与波形相似性分析
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
T. Fischer;J. Michałek
通讯作者: J. Michałek
DOI: --
发表时间: 1984
期刊:
影响因子: --
作者:
E. Engdahl
通讯作者: E. Engdahl
中欧埃格尔 (Ohře) 裂谷西部上地幔的地震结构和二氧化碳源位置
DOI: 10.1029/2004tc001672
发表时间: 2005
期刊: Tectonics
影响因子: 4.2
作者:
W. Geissler;H. Kämpf;R. Kind;K. Bräuer;K. Klinge;T. Plenefisch;J. Horalek;J. Zedník;V. Nehybka
通讯作者: V. Nehybka
DOI: 10.1111/j.1365-3121.1992.tb00455.x
发表时间: 1992
期刊: Terra Nova
影响因子: 2.4
作者:
K. Mengel;H. Kern
通讯作者: K. Mengel;H. Kern
反射地震学--全球视野
DOI: --
发表时间: 1991
期刊:
影响因子: --
作者:
M. Barazangi;Larry D. Brown
通讯作者: Larry D. Brown