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Scaling properties and anomalous diffusion of the Florina micro-seismic activity: Fluid driven?
Geomechanics for Energy and the Environment ( IF 3.3 ) Pub Date : 2019-10-09 , DOI: 10.1016/j.gete.2019.100155
Georgios Michas , Filippos Vallianatos

Episodic earthquake activity associated with pore-fluid pressure diffusion in the crust can frequently be observed in intraplate regions, particularly related with past volcanism. Increased micro-seismicity has been observed during 2012–2014 in such an area, near the CO2-rich Florina basin (North Greece). Using a high-resolution relocated catalog for the area, we use concepts of statistical physics to study the spatiotemporal and diffusion properties of micro-seismicity and investigate the possible involvement of fluids in the triggering mechanism. The spatial distribution of events shows that seismicity mainly occurred in two clusters, one dipping to the north (cluster A) and the other on an almost vertical fault plane (cluster B). We focus on cluster B, which was mainly activated after the installation of a local seismic network, able to detect and record the increased micro-seismicity in the area. Cluster B was activated during two main periods (periods B1–B2), with an almost vertical alignment of events with depth. During the second period of activation (period B2), events are migrating towards the surface with time indicating a diffusive process. Furthermore, the estimation of the mean square displacement of seismicity with time during the two main periods of activation shows very weak earthquake diffusion during period B1, but more pronounce earthquake diffusion during period B2, with a diffusion exponent that corresponds to a sub-diffusive process. In addition, we use non-extensive statistical mechanics to study the spatiotemporal scaling properties of seismicity, with results that indicate correlated behavior and organization patterns during both periods of activation. Observations and analysis indicate the possible involvement of fluids in the triggering mechanism of micro-seismicity. However, continued monitoring of seismicity and CO2 discharging would be required to better constrain the relation between seismicity and CO2 emissions in the CO2-rich Florina basin and to better quantify the associated earthquake and environmental hazards.



中文翻译:

Florina微地震活动的缩放性质和异常扩散:流体驱动?

在板内区域经常观察到与地壳中的孔隙流体压力扩散有关的间歇性地震活动,特别是与过去的火山活动有关。在2012年至2014年期间,在靠近CO 2的区域观察到微震性增加。丰富的弗洛里纳盆地(希腊北部)。使用该地区的高分辨率重新定位目录,我们使用统计物理学的概念来研究微地震的时空和扩散特性,并研究流体在触发机制中的可能参与。事件的空间分布表明,地震活动主要发生在两个群集中,一个群集向北倾斜(群集A),另一个群集在几乎垂直的断层平面上(群集B)。我们关注的是群集B,它主要是在安装了本地地震网络后才激活的,能够检测并记录该地区微地震的增加。集群B在两个主要时期(时期B1-B2)被激活,事件与深度几乎垂直对齐。在激活的第二个阶段(期间B2),随着时间的流逝,事件向表面迁移,表明扩散过程。此外,在两个主要激活期间内,地震活动性的均方位移随时间的估算表明,B1期间的地震扩散非常弱,但B2期间的地震扩散更为明显,其扩散指数对应于次扩散过程。此外,我们使用非广泛的统计机制来研究地震活动的时空尺度特性,其结果表明在两个激活期间相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO 在激活的两个主要时期内,地震活动性的均方位移随时间的估算表明,在时期B1中,地震扩散非常弱,但在时期B2中,地震扩散更为明显,扩散指数对应于次扩散过程。此外,我们使用非广泛的统计机制来研究地震活动的时空尺度特性,其结果表明在两个激活期间相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。但是,继续监测地震和CO 在激活的两个主要时期内,地震活动性的均方位移随时间的估算表明,在时期B1中,地震扩散非常弱,但在时期B2中,地震扩散更为明显,扩散指数对应于次扩散过程。此外,我们使用非广泛的统计机制来研究地震活动的时空标度特性,其结果表明在两个激活期间相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO 但在B2时期更明显的地震扩散,其扩散指数对应于次扩散过程。此外,我们使用非广泛的统计机制来研究地震活动的时空标度特性,其结果表明在两个激活期间相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO 但在B2时期更明显的地震扩散,其扩散指数对应于次扩散过程。此外,我们使用非广泛的统计机制来研究地震活动的时空尺度特性,其结果表明在两个激活期间相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO 结果表明在激活的两个阶段中相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO 结果表明在激活的两个阶段中相关的行为和组织模式。观察和分析表明,流体可能参与了微地震的触发机制。然而,继续监测地震活动和CO需要2排放才能更好地约束富CO 2的弗洛里纳盆地地震活动性和CO 2排放之间的关系,并更好地量化相关的地震和环境危害。

更新日期:2019-10-09
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