Intrusions are a ubiquitous component of mountain chains and testify to the emplacement of magma at depth. Understanding the emplacement and growth mechanisms of intrusions, such as diapiric or dike-like ascent, is critical to constrain the evolution and structure of the crust. Petrological and geological data allow us to reconstruct magma pathways and long-term magma differentiation and assembly processes. However, our ability to detect and reconstruct the short-term dynamics related to active intrusive episodes in mountain chains is embryonic, lacking recognized geophysical signals. We analyze an anomalously deep seismic sequence (maximum magnitude 5) characterized by low-frequency bursts of earthquakes that occurred in 2013 in the Apennine chain in Italy. We provide seismic evidences of fluid involvement in the earthquake nucleation process and identify a thermal anomaly in aquifers where CO₂ of magmatic origin dissolves. We show that the intrusion of dike-like bodies in mountain chains may trigger earthquakes with magnitudes that may be relevant to seismic hazard assessment. These findings provide a new perspective on the emplacement mechanisms of intrusive bodies and the interpretation of the seismicity in mountain chains.

中文翻译：

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山区链中主动侵入的地震特征。

入侵是山脉的无处不在的组成部分，证明了岩浆在深处的位置。了解侵入物的形成和生长机制（例如，双壁或堤状上升），对于限制地壳的演化和结构至关重要。岩石和地质数据使我们能够重建岩浆通道以及长期的岩浆分异和组装过程。但是，我们检测和重建与山脉中活跃的侵入性事件有关的短期动态的能力是胚胎的，缺乏公认的地球物理信号。我们分析了一个异常深的地震序列（最大震级为5），其特征是2013年在意大利的亚平宁链发生了低频地震爆发。岩浆成因₂溶解。我们表明，堤坝中像堤防一样的物体的侵入可能会引发与地震危险性评估有关的震级。这些发现为侵入体的进位机制和对山链地震活动的解释提供了新的视角。