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Seismically Induced Snow Avalanches: The Central Italy Case
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2020-10-07 , DOI: 10.3389/feart.2020.599611
Tommaso Piacentini , Monia Calista , Uberto Crescenti , Enrico Miccadei , Nicola Sciarra

Snow avalanches are critical events due to the sudden instability of snow in mountain regions. Seismically induced snow avalanches, due to a particular type of trigger perturbing snow-covered slopes, are occasional events in geodynamically active mountain regions around the world, which can lead to large anomalous avalanches. The seismic trigger of an avalanche is either simultaneous or delayed. In Italy, the Alps, and particularly the Apennines, feature large areas expected to be affected by seismically induced snow avalanches. In this work, the avalanches’ distribution in Central Italy (i.e., Abruzzo region) and its connection with moderate–high seismicity were investigated. With regional and historical analyses, we investigated the connection between avalanches and seismicity. We revealed two main events of seismically induced avalanches (April 6–9, 2009, western Gran Sasso-Assergi area, and January 18, 2017, Gran Sasso massif) characterized by an anomalous distribution of avalanches. A specific and detailed analysis focused on the northeast Mt. Siella slope, where well-documented and constrained events occurred on January 18, 2017 in the Gran Sasso area, affecting a tourist facility. This involves geomorphological and photogeological multitemporal investigations. Moreover, the Rigopiano avalanche was analyzed through 3D numerical modeling and stability analysis of the snow to investigate the possible seismic trigger. We found the avalanche was consistent with delayed seismically induced avalanche cases. This combination contributed to a more general assessment of the seismically induced avalanches in the Central Apennines area (i.e., Abruzzo region) and provided new examples of seismically induced avalanches at both the regional and detailed scales, which are largely consistent with the world distribution.



中文翻译:

地震诱发的雪崩:意大利中部案例

由于山区雪的突然不稳定,雪崩是关键事件。由于一种特殊类型的触发器扰乱了积雪的斜坡,地震诱发的雪崩是世界各地活跃于地球动力学的山区的偶发事件,可导致大型异常雪崩。雪崩的地震触发是同时发生或延迟发生的。在意大利,阿尔卑斯山(尤其是亚平宁山脉)的大面积地区预计会受到地震诱发的雪崩的影响。在这项工作中,研究了意大利中部(即阿布鲁佐地区)的雪崩分布及其与中高地震活动的联系。通过区域和历史分析,我们研究了雪崩和地震活动之间的联系。我们揭示了地震诱发雪崩的两个主要事件(2009年4月6日至9日,西部Gran Sasso-Assergi地区和2017年1月18日,Gran Sasso断层),其特征是雪崩异常分布。针对东北山进行了具体而详细的分析。Siella山坡,2017年1月18日在Gran Sasso地区发生了有据可查并受到限制的事件,影响了旅游设施。这涉及地貌和光地质多时相调查。此外,通过3D数值建模和雪的稳定性分析对Rigopiano雪崩进行了分析,以研究可能的地震触发因素。我们发现雪崩与延迟地震诱发的雪崩情况一致。

更新日期:2020-11-13
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