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Abstract
Submarine landslides are major geohazards occurring on distinct seabed domains ranging from shallow coastal areas to the deeper points of the ocean. The nature and relief of the seabed are key factors influencing the location and size of submarine landslides. Efforts have recently been made to compile databases of submarine landslide distribution and morphometry, a crucial task to assess submarine geohazards. The MAGICLAND (Marine Geo-hazards Induced by underwater Landslides in the SW Iberian Margin) database here presented contributed to that assessment offshore Portugal. Based on EMODnet bathymetric DEMs and GIS analysis, the morphometric properties of 1552 submarine landslides were analysed and wealth of 40 parameters was obtained. This dataset is now made available for the free use and benefit of the international marine community. Further contributions or analysis based on, and complementing the MAGICLAND database will be welcome.
Highlights
Background & SummarySubmarine mass movements are common occurrences on marine domains, from the shallow coasts to the deepest areas of the oceans[1]
This work presents the MAGICLAND (Marine Geo-hazards Induced by underwater Landslides in the SW Iberian Margin) database, which covers the geographical area from 33° 45′ N to 43° N and from 6° 22′ W to 16° 15′ W, and compiles geomorphological data of 1552 submarine landslides based on the interpretation of Digital Elevation Model (DEM) bathymetric grids provided by EMODnet[23] (Fig. 1)
This section describes the methodology workflow used for data acquisition and preparation. This was set in three main stages, namely the Digital Elevation Model (DEM) data loading, the manual digitizing of landslide features, and volume calculation procedures
Summary
Background & SummarySubmarine mass movements are common occurrences on marine domains, from the shallow coasts to the deepest areas of the oceans[1]. — Length-Width ratio calculated using the realistic measurement km Perimeter of the full landslide-delimiting (evacuation and deposit, if present) polygon km[2] Area of the landslide calculated within the polygon km[2] Realistic surface area of the landslide derived from the 3D DEM This work presents the MAGICLAND (Marine Geo-hazards Induced by underwater Landslides in the SW Iberian Margin) database, which covers the geographical area from 33° 45′ N to 43° N and from 6° 22′ W to 16° 15′ W, and compiles geomorphological data of 1552 submarine landslides based on the interpretation of DEM bathymetric grids provided by EMODnet[23] (Fig. 1).
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