Fluid overpressure is a primary mechanism behind fault interaction and earthquakes triggering. The Apennines section within the young Alpine mobile belt is a key locus to investigate the interplay between fluids and faults. Here, seismicity develops along the extending mountain belt and the key role of fluids has been invoked in past large earthquake sequences. In this study, we use seismological data to get improved images of the Apennines normal faulting system, trying to catch evidences for the involvement of fluids in the preparatory phase of large earthquakes. We observe that extension preferentially reutilizes inherited fragments of faults which were assembled during the Mio‐Pliocene contraction, with steep segments that floor on a regional‐scale gently east dipping plane. We find evidences for wide volumes of overpressured fluids at the base of the seismogenic layer, which are connected to the activation of the recent large earthquakes. The recognition of fluids compartments with overpressuring and diffusion molding seismicity is a key to understand faulting processes and possibly develop forecasts scenarios.

中文翻译：

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流体超压驱动的大地震：亚平宁山脉正常断裂系统案例

流体超压是断层相互作用和地震触发背后的主要机制。年轻的高山移动带中的亚平宁山脉部分是研究流体与断层之间相互作用的关键所在。在这里，地震活动性沿着延伸的山地带发展，而流体的关键作用在过去的大地震序列中得到了体现。在这项研究中，我们使用地震数据来获得亚平宁山脉正常断裂系统的改进图像，试图收集有关流体参与大地震预备阶段的证据。我们观察到，延伸优先重用了在上新统收缩期间组装的断层的继承碎片，陡峭的断层位于区域规模的缓东倾角平面上。我们发现在震源层底部存在大量超压流体的证据，这些超压流体与最近发生的大地震的激活有关。识别具有超压和扩散模塑地震活动性的流体隔层是了解断层过程并可能开发预测方案的关键。