Tiwari Deepak K, Jha Birendra, Kundu Bhaskar, Gahalaut Vineet K, Vissa Naresh K
Department of Earth and Atmospheric Sciences, NIT Rourkela, Rourkela, 769008, India.
Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90007-1211, USA.
Sci Rep. 2021 May 12;11(1):10097. doi: 10.1038/s41598-021-89527-3.
The non-tectonic deformation, either of natural or anthropogenic origin, may influence the earthquake occurrence process and seismicity rate along the plate-boundary or 'stable' plate-interiors domains. The low magnitude but moderate seismicity rate of Delhi region on the stable plate-interiors domains of India, exhibits significant variation both in short-term at annual seasonal scale and in long-term at decadal scale. It correlates with the anthropogenic groundwater pumping for the extensive irrigation, urban activities, and seasonally controlled hydrological loading cycle of Indo-Ganga Basin hosted freshwater aquifers. Our coupled hydro-mechanical simulation and poro-mechanical analysis of basement fault stability suggest that the combined aquifer contraction and basement rock expansion act together to modulate the effective stress regime and anthropogenic seismicity on the basement faults in Delhi region.
非构造变形，无论是自然起源还是人为起源，都可能影响沿板块边界或“稳定”板块内部区域的地震发生过程和地震活动率。印度稳定板块内部区域的德里地区地震震级低但地震活动率适中，在年度季节尺度的短期和十年尺度的长期内都表现出显著变化。它与为广泛灌溉、城市活动以及印度-恒河盆地淡水含水层季节性控制的水文加载周期而进行的人为地下水抽取有关。我们对基底断层稳定性的耦合水力-力学模拟和孔隙-力学分析表明，含水层收缩和基底岩石膨胀共同作用，调节德里地区基底断层上的有效应力状态和人为地震活动。
