Spatial and temporal variations of the fluid signatures with regard to ongoing magmatic and different earthquake swarm activity beneath the Cheb basin/CZ

点击翻译按钮获取中文摘要

Mantle-derived fluid migration through the lithosphere, its interrelation to swarm earthquake seis-micity and fault-related magma/fluid transport in the crust are in focus of the studies. The proposal is based on gas and isotope time series data which have been recorded at eight different de-gassing locations of the Cheb basin and its northern periphery up to December 2010 due to ongo-ing magmatic activity and three different strong swarm earthquake periods occurred between 1994 and 2008. We are aiming in detail (1) to evaluate the temporal and spatial occurrence of fluid anomalies after the earthquake swarm 2008 related to Mariánské Láznĕ and the Počatky-Plesná fault zone, (2) to compare seismically triggered fluid anomalies of the strong swarms 2000 and 2008 in relation to the different swarm properties, (3) to explore the progressive spatial and temporal increase of mantle-derived helium fractions at locations close to the focal zone, (4) to obtain isotopic indications for ascending magma from a deeper reservoir by detailed analysis of helium, carbon isotope time series since 1994 at Bublák - the location with the highest gas flux. The final interpretation of all data will provide assistance in the interpretation of temporal and spa-tial anomalies observed in geophysical studies and will supply essential information to find an optimal ICDP drilling location in the western Eger rift area.