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Small-scale slope instability on the submarine flanks of insular volcanoes: the case-study of the Sciara del Fuoco slope (Stromboli)
International Journal of Earth Sciences ( IF 2.3 ) Pub Date : 2020-03-31 , DOI: 10.1007/s00531-020-01853-5
Daniele Casalbore , Flavio Passeri , Paolo Tommasi , Luca Verrucci , Alessandro Bosman , Claudia Romagnoli , Francesco Latino Chiocci

Small-scale landslides affecting insular and coastal volcanoes are a relevant geohazard for the surrounding infrastructures and communities, because they can directly impact them or generate local but devastating tsunamis, as demonstrated by several historical accounts. Here, a review of such landslides and associated predisposing/triggering mechanisms is presented, with particular reference to the submarine volcanic flanks. We take into account, as a case study, the instability phenomena occurring on the Sciara del Fuoco (SdF, hereafter), a 2-km wide subaerial-submarine collapse scar filled by volcaniclastic products, which form the NW flank of the Stromboli volcano. Because of its steepness (> 30°) and the high amount of loose volcanic material funneled from the summit crater towards the sea, the submarine part of the SdF is prone to instability phenomena recurring at different spatial and temporal scale. Particularly, landsides with a volume of some millions of cubic meters, as the 2002 tsunamigenic landslide, can repeatedly affect the submarine slope. Based on the integration of 11 years (2002–2013) of morpho-bathymetric monitoring of the SdF with geotechnical characterization of volcaniclastic and lava flow materials, stability analyses of the subaerial and submarine slope and previous literature studies, we analyze the role of different triggering mechanisms in controlling the occurrence and size of submarine slope failures at the SdF, such as dykes intrusion as occurred in 2002 or the emplacement of a large delta as occurred in 2007.



中文翻译:

岛状火山海底侧面的小规模斜坡失稳:Sciara del Fuoco斜坡(斯特龙博利)的案例研究

影响岛屿和沿海火山的小规模滑坡是周围基础设施和社区的重要地质灾害,因为它们可以直接影响它们或产生局部但破坏性的海啸,如一些历史记载所表明的那样。在此,对此类滑坡及其相关的诱发/触发机制进行了回顾,特别是针对海底火山岩侧面。作为案例研究,我们考虑了在Sciara del Fuoco(以下简称SdF)上发生的不稳定现象,Sciara del Fuoco是一个2公里宽的海底海底坍塌疤痕,上面充满了火山碎屑产物,形成了斯特龙博利火山西北翼。由于其陡峭度(> 30°),并且有大量的松散火山物质从山顶火山口流向大海,SdF的海底部分容易出现在不同时空尺度上反复出现的不稳定现象。特别是,像2002年的海啸致滑坡那样,体积达数百万立方米的土地会反复影响海底斜坡。基于对SdF的11年(2002-2013)形态测深监测与火山碎屑和熔岩流动物质的岩土工程表征,海底和海底边坡的稳定性分析以及先前的文献研究相结合的结果,我们分析了不同触发的作用控制SdF的海底斜坡故障的发生和大小的机制,例如2002年发生的堤防入侵或2007年发生的大三角洲侵袭。像2002年的海啸滑坡一样,体积达数百万立方米的山坡会反复影响海底斜坡。基于对SdF的11年(2002-2013)形态测深监测与火山碎屑和熔岩流动物质的岩土工程表征,海底和海底边坡的稳定性分析以及先前的文献研究相结合的结果,我们分析了不同触发的作用控制SdF的海底斜坡故障的发生和大小的机制,例如2002年发生的堤防入侵或2007年发生的大三角洲侵袭。像2002年的海啸滑坡一样,体积达数百万立方米的山坡会反复影响海底斜坡。基于对SdF的11年(2002-2013)形态测深监测与火山碎屑和熔岩流动物质的岩土工程表征,海底和海底斜坡的稳定性分析以及先前的文献研究相结合的结果,我们分析了不同触发作用的作用。控制SdF的海底斜坡故障的发生和大小的机制,例如2002年发生的堤防入侵或2007年发生的大三角洲侵袭。

更新日期:2020-04-21
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