Regional two-dimensional magnetotelluric profile in West Bohemia/Vogtland reveals deep conductive channel into the earthquake swarm region
Regional two-dimensional magnetotelluric profile in West Bohemia/Vogtland reveals deep conductive channel into the earthquake swarm region
复制标题
西波希米亚/沃格特兰的区域二维大地电磁剖面揭示了进入地震群区域的深层传导通道
DOI：
10.1016/j.tecto.2018.01.012
复制
发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
Klanica
中科院分区：
文献类型：
--
作者：
Muñoz;Weckmann;Kováčiková;Klanica
西波西米亚/Vogtland地区以Eger （Ohře）裂谷和Mariánské Lázně断裂相交为特征，是一个反复发生地震群、大量二氧化碳排放和中更新世火山活动的地球动力学活跃地区。埃格尔裂谷是欧洲唯一已知的大陆内部区域，目前发生了如此深的、活跃的岩石圈过程。我们展示了一幅电阻率图像，该图像是通过穿越埃格尔裂谷的区域剖面获得的大地电磁（MT）数据的二维反演获得的。在近地表，Cheb盆地和哺育Bublák和Hartoušov mofette油田的含水层已被成像为极低电阻率区域的一部分。然而，最引人注目的电阻率特征是一条从地表延伸到下地壳的深层导电通道，该通道在空间上与Nový Kostel震源带地震事件的震源相关。这条通道被解释为一条从可能的地壳中部流体储层到地表的通道。电阻率模型强化了深部断裂流体循环与地震发生的关系。此外，在剖面的南部还发现了一条导电通道。另一个特征可能与Mýtina和/或Neualbenreuth Maar构造相关的化石热液蚀变有关，或者也可能是与Saxo-Thuringian带和Teplá-Barrandian带之间的缝合带相关的构造的标志，其表面表达仅位于几公里外。
The West Bohemia/Vogtland region, characterized by the intersection of the Eger (Ohře) Rift and the Mariánské Lázně fault, is a geodynamically active area exhibiting repeated occurrence of earthquake swarms, massive CO2emanations and mid Pleistocene volcanism. The Eger Rift is the only known intra-continental region in Europe where such deep seated, active lithospheric processes currently take place. We present an image of electrical resistivity obtained from two-dimensional inversion of magnetotelluric (MT) data acquired along a regional profile crossing the Eger Rift. At the near surface, the Cheb basin and the aquifer feeding the mofette fields of Bublák and Hartoušov have been imaged as part of a region of very low resistivity. The most striking resistivity feature, however, is a deep reaching conductive channel which extends from the surface into the lower crust spatially correlated with the hypocentres of the seismic events of the Nový Kostel Focal Zone. This channel has been interpreted as imaging a pathway from a possible mid-crustal fluid reservoir to the surface. The resistivity model reinforces the relation between the fluid circulation along deep-reaching faults and the generation of the earthquakes. Additionally, a further conductive channel has been revealed to the south of the profile. This other feature could be associated to fossil hydrothermal alteration related to Mýtina and/or Neualbenreuth Maar structures or alternatively could be the signature of a structure associated to the suture between the Saxo-Thuringian and Teplá-Barrandian zones, whose surface expression is located only a few kilometres away.
登录
查看更多内容
DOI：
10.1002/2015jb012582
发表时间：
2016-04
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
S. Hainzl;T. Fischer;H. Čermáková;M. Bachura;J. Vlček
通讯作者：
S. Hainzl;T. Fischer;H. Čermáková;M. Bachura;J. Vlček
影响因子：
--
作者：
C. Jarchow;G. A. Thompson;R. Catchings;W. Mooney
通讯作者：
C. Jarchow;G. A. Thompson;R. Catchings;W. Mooney
波希米亚地块西部（中欧）的板内地震活动：与古板块交界处的可能相关性
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
V. Babuška;J. Plomerová;T. Fischer
通讯作者：
T. Fischer
影响因子：
3.9
作者：
H. Kämpf;K. Bräuer;J. Schumann;K. Hahne;G. Strauch
通讯作者：
H. Kämpf;K. Bräuer;J. Schumann;K. Hahne;G. Strauch
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
V. R. Gajevskiy
通讯作者：
V. R. Gajevskiy