Can hydroseismicity explain recurring earthquake swarms in NW-Bohemia?

Can hydroseismicity explain recurring earthquake swarms in NW-Bohemia?
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水震活动可以解释波希米亚西北部反复发生的地震群吗?

DOI:
10.1093/gji/ggx412
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发表时间:
2018
影响因子:
2.8
通讯作者:
Telesca
Telesca
中科院分区:
地球科学2区
文献类型:
--
作者:
Heinicke;Alexandrakis;Telesca

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流体驱动的地震活动已在世界范围内观察到。孔隙压力扰动触发板内地震活动是一个被广泛接受的过程。过去对西北波希米亚/沃格特兰地区地震群的分析为每个群内地震迁移过程中孔隙压力前沿的扩散提供了证据。在这里,我们测试的假设是否扩散的水力引起的孔隙压力扰动从表面到震源深度可能是一个有效的触发机制。我们基于对1992年至2016年期间发生的121次地震群和微群的分析,对November Kostel震源区的地震群进行了检验。在过去的30年中,90%的地震群聚集在November Kostel村下方,深度范围在6至12公里之间。群的空间分布表明,震源的主要扩散途径,即管道沿着西北-东南走向的断裂带,可以在表面与Libocktail小溪的一部分。该断裂带的次级分支存在于霍尔卡水库下方的南部。该水库的蓄水始于1969年,可能于1985/1986年在November Kostel地区引发了上个世纪的第一次重大地震群。从那时起,无论是潜在的触发震群的数量以及微震群的数量随着时间的推移而增加,根据一个强大的统计评估,水力引起的孔隙压力扰动可能引发至少19%的分析地震群假设有效扩散率为0.5 m2 s-1。因此,水震活动似乎是一个有效的选择,至少可以解释一部分的地震群。另一种假设是,上升/侵入的岩浆流体触发了地震群的剩余部分,这是另一个潜在的,但薄弱的选择。
Fluid driven seismicity has been observed worldwide. The occurrence of intraplate seismicity triggered by pore pressure perturbations is a widely accepted process. Past analysis of earthquake swarms in the NW-Bohemia/Vogtland region provided evidence for the diffusion of pore pressure fronts during the migration of earthquakes within each swarm. Here, we test the hypothesis whether the diffusion of hydraulically induced pore pressure perturbations from the surface to the hypocentral depth could be a valid trigger mechanism. We test this hypothesis for the earthquake swarms in the Nový Kostel focal zone based on the analysis of 121 earthquake swarms and microswarms which occurred between 1992 and 2016.During the past 30 yr, 90 per cent of the earthquake swarms clustered beneath the village Nový Kostel within a depth range between 6 and 12 km. The spatial distribution of the swarms suggests a main diffusion pathway to the hypocentres, namely conduits along a NW-SE trending fracture zone which can be correlated at the surface with a part of the Libocký creek. A secondary branch of this fault zone exits in the southern part below the Horka reservoir. The filling of this reservoir began in 1969 and might have triggered the first significant earthquake swarm during the last century within the Nový Kostel area in the year 1985/1986. Since then, both the number of potentially triggered swarms as well as the number of microswarms increased with time.According to a robust statistical evaluation, hydraulically induced pore pressure perturbations could have triggered at least 19 per cent of the analysed earthquake swarms assuming effective diffusivities of 0.5 m2s–1. Thus, hydroseismicity seems to be a valid option to explain at least a part of the earthquake swarms. The alternate hypothesis that ascending/intruding magmatic fluids trigger the remaining part of the earthquake swarms is another potential but weak option.
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