Groundwater from karst circulation systems of Central Italy were sampled and analyzed, in 2018, for delineating a preliminary, general geochemical framework of their relationship with neotectonics, in an area characterized by a frequent and often destructive seismicity. We determined field physical-chemical parameters, concentrations of main dissolved ions and gases and isotopic composition of water (δ18O, δD) and total dissolved inorganic carbon (δ13C TDIC). We discriminated between “normal” hydro-karst systems and multi-component aquifers, composed of meteoric groundwater that have also interacted with rocks of different lithological nature and/or deep fluids. These multicomponent aquifers are of potential interest in the monitoring of neotectonics activity, because changes in the stress field associated with the preparatory phase of an earthquake may affect the permeability of rocks, in turn causing variation of their chemical-isotopic character. The geographical distribution of these aquifers seems to be controlled by tectonics. In fact, the Olevano–Antrodoco–Sibillini thrust separates the more anomalous sites, located westwards of it, from the groundwater bodies at its eastern side, showing a more typical karst character.

中文翻译：

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意大利中部岩溶含水层水文地球化学特征及其与新构造的关系

2018 年，对来自意大利中部岩溶循环系统的地下水进行了采样和分析，以在一个以频繁且往往具有破坏性地震活动为特征的地区描绘出其与新构造运动关系的初步一般地球化学框架。我们确定了现场理化参数、主要溶解离子和气体的浓度以及水的同位素组成（δ18O、δD）和总溶解无机碳（δ13C TDIC）。我们区分了“正常”水岩溶系统和多组分​​含水层，后者由大气地下水组成，这些含水层也与不同岩性性质的岩石和/或深层流体相互作用。这些多组分含水层在监测新构造活动方面具有潜在意义，因为与地震准备阶段相关的应力场的变化可能会影响岩石的渗透性，进而导致其化学同位素特征的变化。这些含水层的地理分布似乎受构造控制。事实上，Olevano-Antrodoco-Sibillini逆冲断层将其西侧的异常地点与其东侧的地下水体分开，表现出更典型的喀斯特特征。