ABSTRACT

In this paper we present geomorphological hazard mapping of the San Vito Peninsula offshore (Sicilian margin of Tyrrhenian Sea), characterised by a very narrow continental shelf and a very dipping, tectonically active continental slope, no far from a seismogenic belt. The data set consists of morpho-bathymetric models achieved by means of multibeam survey and scattered high resolution seismic profiles. The morpho-bathymetric study highlighted some potential sites of geomorphological hazards, the most representative of which are: (i) two canyons developing from the upper slope off San Vito Cape down to the Erice basin; (ii) a dense network of small incisions across the upper slope; (iii) a very active landslide, developed onland and extending in the continental shelf close to the Scopello village. The geomorphological features that can generate submarine hazard are represented by: unstable sediment packages into canyon heads or along the upper slope; submarine canyons with regressive erosion; coastal landslides.

摘要

在本文中，我们介绍了圣维托半岛近海（第勒尼安海的西西里边缘）的地貌灾害图，其特征是大陆架非常狭窄，构造活动的大陆倾斜度非常低，离地震带不远。该数据集包括通过多波束测量和分散的高分辨率地震剖面获得的形态测深模型。形态测深研究突出了一些潜在的地貌危险场所，其中最具代表性的是：（i）从圣维托角附近的上坡一直延伸到埃里切盆地的两个峡谷；（ii）横跨上坡的密集小切口网络；（iii）一个非常活跃的滑坡，在陆地上发展并在靠近Scopello村庄的大陆架上延伸。可能引起海底灾害的地貌特征表现为：不稳定的沉积物堆积到峡谷顶部或沿上坡；具有退化侵蚀的海底峡谷；沿海滑坡。