An investigation of Lippija coastal cliff fractures through photogrammetry

Abstract

Considering the geomorphological features of the islands of Malta, the north-western coast can be considered as having some of the most unstable and geodynamic cliffs. The study site that will be discussed is situated on the north-western coast and is influenced, among other features, by the horst and graben setting that is equivalent to the plateau and valley in the area, together with the over position of Upper Coralline Limestone over Blue Clay. These features facilitate the occurrence of certain types of landslides, such as rock falls and lateral spreads. The study site includes a historical watchtower. The research conducted is aimed at facilitating the mapping and better understanding of the dynamics within the land mass, as this can be included in multidisciplinary studies of the area that intend to understand the possible hazards afflicting the study site. The area is mapped by using a drone to obtain photographic footage and Agisoft PhotoScan to obtain the final processed three-dimensional model using triangulation. This model is then used to be able to delineate potential active units, describe these according to the setting and assess the hazard that these might pose to the immediate area. The studies of the model allude that the cliff face in question is very active and fractured, showing evidence that blocks are being detached from the said cliff face.