Abstract The 2016–2017 seismic sequence in Central Italy caused the reactivation of a complex NNW-SSE trending, WSW-dipping normal fault system associated with relevant coseismic ruptures. The seismic sequence significantly affected the groundwater circulation hosted in limestone aquifers. Based on the data available in May 2019, this work aims to contribute to understanding how the reactivation of the seismogenic faults has influenced the hydrological system of the upper Nera River basin. It appears that the seismic sequence changed the recession processes of the Nera River. Post-seismic recession curves are described by straight lines (non-darcian flow), while the pre-seismic ones follow the exponential function (darcian flow). After the earthquake, the system empties (i.e., the storage decreases) at a faster rate than before; this effect persists after more than two years from the 2016 earthquake. According to some geological cross-sections, the analysis of coseismic deformations and recession curves, a presumable increase in aquifer permeability seems to be the main factor affecting the post-earthquake river discharge. If the non-darcian recession process continues in the future, the river flow will be more variable than in the past, causing significant problems to water-using productive activities. This because, during prolonged drought periods, the fast decrease of the dynamic water storage would produce discharges lower than in the past. The results here reported can contribute to the understanding of the medium-long term evolution of this particular hydrological system as well as of other similar ones and could be useful to better managing the groundwater resources.

中文翻译：

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地震对地下水系统排放的影响：以 2016 年意大利中部亚平宁地震序列为例

摘要 意大利中部 2016-2017 年的地震序列导致与相关同震破裂相关的复杂的 NNW-SSE 走向、WSW 倾斜的正断层系统重新激活。地震序列显着影响了石灰岩含水层中的地下水循环。根据 2019 年 5 月的可用数据，这项工作旨在帮助了解发震断层的重新激活如何影响内拉河流域上游的水文系统。地震序列似乎改变了内拉河的衰退过程。震后衰退曲线用直线描述（非达西流），而震前衰退曲线遵循指数函数（达西流）。地震后，系统清空（即存储量减少）的速度比以前更快；这种影响在 2016 年地震发生两年多后仍然存在。根据一些地质剖面、同震变形和衰退曲线的分析，含水层渗透率的增加似乎是影响震后河流流量的主要因素。如果未来非达西衰退过程继续下去，河流流量将比过去更加多变，给用水生产活动带来重大问题。这是因为，在长期干旱期间，动态蓄水量的快速减少会导致排放量低于过去。