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

Cheb 盆地/CZ 下方持续岩浆和不同地震群活动的流体特征的时空变化

• 批准号: 206105457
• 负责人: Dr. Gerhard Strauch
• 金额: --
• 依托单位: Department Hydrogeologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/206105457?language=en
• 关键词: Spatial; temporal; variations; fluid; signatures

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.

幔源流体在岩石圈中的运移、幔源流体与震群地震活动的相互关系以及与断层有关的岩浆/流体在地壳中的运移是研究的重点。该提议基于气体和同位素时间序列数据，这些数据是在切布盆地及其北方外围的8个不同脱气位置记录的，截至2010年12月，由于持续的岩浆活动和1994年至2008年期间发生的3个不同的强震群。我们的目标是详细（1）评估与Mariánské Láznshirch和Počatky-Plesná断层带有关的2008年震群后流体异常的时空发生情况，（2）比较2000年和2008年强震群与不同震群性质有关的地震触发流体异常，（3）探索震源区附近幔源氦组分在空间和时间上的逐渐增加;（4）通过对氦的详细分析，获得来自更深储层的岩浆上升的同位素指示;自1994年以来在Bublák -气体流量最高的地点-的碳同位素时间序列。所有数据的最终解释将有助于解释地球物理研究中观察到的时间和空间异常，并将为在西部埃格裂谷区找到最佳ICDP钻探位置提供重要信息。