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首页> 外文期刊>Journal of geodynamics >Alteration as possible cause for transition from brittle failure to aseismic slip: the case of the NW-Bohemia/Vogtland earthquake swarm region
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Alteration as possible cause for transition from brittle failure to aseismic slip: the case of the NW-Bohemia/Vogtland earthquake swarm region

机译：从脆性破坏过渡到抗震滑移的可能原因：NW-Bohemia / Vogtland地震群地区的情况

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摘要

The geodynamic activity of the NW-Bohemia / Vogtland region with its earthquake swarm activity is always studied in relation to the local emission of juvenile fluids, in particular of CO2. Based on a 3D interpretation of the geological setting, geophysical results, and new evaluation of existing data, our approach suggests a spatial separation of the upper crust into areas with differing pore fluids. The first area comprises a mixture of juvenile and meteoric pore fluids, where juvenile CO2 diffuses towards the surface. The second area exclusively contains meteoric and no juvenile pore fluids. It is in this area where the earthquake swarm activity occurs.This separation provides an important constraint which influences shear processes as the contrasting fluid chemistry induces different interaction of wall rock with pore fluids. Long-lasting chemical degradation of the wall-rock with clay as a typical alteration product in crustal volumes with pervasive CO2 discharge reduces the friction coefficients resulting in the weakening of the fault zone and allowing an aseismic slip according to the stress field. The presented studies suggest that the junction of two regional geological features of crustal scale, the N S trending seismically active Leipzig-Regensburg-zone and the NW-SE trending fluid emission zone of magmatic volatiles, can be interpreted as a transition from frictional slip in the recent focal zones to aseismic behavior towards the southwest caused by clay coatings on the shear planes induced by a CO2 containing pore fluid.
机译：西北波希米亚/沃格特兰地区的地球动力学活动及其地震群活动一直都与少年流体，特别是二氧化碳的局部排放有关。基于对地质环境，地球物理结果和对现有数据的新评估的3D解释，我们的方法建议将上地壳在空间上分为具有不同孔隙流体的区域。第一区域包括少年和流星孔隙流体的混合物，其中少年CO2向地面扩散。第二个区域仅包含大气，没有少年孔隙流体。正是在该区域发生了群虫活动。这种分离提供了一个重要的约束条件，因为对比的流体化学作用引起了围岩与孔隙流体的不同相互作用，从而影响了剪切过程。以粘土作为典型的蚀变产物，伴随着普遍的CO2排放，在地壳中对壁岩进行持久的化学降解，降低了摩擦系数，导致断层带减弱，并根据应力场产生了抗震滑动。提出的研究表明，地壳尺度的两个区域地质特征的交汇处，即NS趋势的地震活跃的莱比锡-雷根斯堡区和NW-SE趋势的岩浆挥发分流体排放区，可以解释为是由摩擦滑移转变而成的。含CO2的孔隙流体在剪切面上形成的粘土涂层引起的西南地震活动的新近震区。

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