TY  - JOUR
A1  - Munoz, Gerard
A1  - Weckmann, Ute
A1  - Pek, Josef
A1  - Kovacikova, Svetlana
A1  - Klanica, Radek
T1  - Regional two-dimensional magnetotelluric profile in West Bohemia/Vogtland reveals deep conductive channel into the earthquake swarm region
JF  - Tectonophysics : international journal of geotectonics and the geology and physics of the interior of the earth
N2  - The West Bohemia/Vogtland region, characterized by the intersection of the Eger (Ohre) Rift and the Marianske Lazne fault, is a geodynamically active area exhibiting repeated occurrence of earthquake swarms, massive CO2 emanations 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 Bublak and Hartousov 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 Novy 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 Mytina and/or Neualbenreuth Maar structures or alternatively could be the signature of a structure associated to the suture between the Saxo-Thuringian and Tepla-Barrandian zones, whose surface expression is located only a few kilometres away.
KW  - Magnetotellurics
KW  - West Bohemia
KW  - Vogtland
KW  - Earthquake swarm
KW  - Conductive channel
KW  - Fluids
Y1  - 2018
U6  - https://doi.org/10.1016/j.tecto.2018.01.012
SN  - 0040-1951
SN  - 1879-3266
VL  - 727
SP  - 1
EP  - 11
PB  - Elsevier
CY  - Amsterdam
ER  -