Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution
XXI Inqua Congress, Time fort Change, 14-20 July 2023, Roma
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2023-07-14
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dig-icm-es-10261-3659892024-08-16T10:53:24Z Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution Retegui, Leire Casas, David Casalbore, Daniele Yenes, Mariano Nespereira, José Ercilla, Gemma Alonso, Belén Estrada, Ferran Chiocci, Francesco L. Idarraga, Javier Teixeira, Manuel Ramos, Jackeline XXI Inqua Congress, Time fort Change, 14-20 July 2023, Roma The Palomares Continental Margin, located in the Iberian Mediterranean margin, encompasses a narrow continental shelf (down to 120m water depth), and a continental slope that extends down to 2500m water depth. Different tectonic and sedimentary features at various scales define the heterogeneous, abrupt and irregular physiography of the margin. The most important features are the morphological highs (Aguilas, Abubacer and Maimonides); prominent submarine canyons (Gata, Almanzora-Alias-Garrucha and Aguilas); morphosedimentary features associated with contour currents (mainly in the continental slope) and sedimentary instability deposits of different size distributed throughout the margin. The analysis of medium and high resolution, 50m and 15 m respectively multibeam bathymetric data has allowed to build a regional inventory of 937 events of sedimentary instability, defined by their scars and head areas. Mass-wasting affect more than 821 km2 and mobilize approximately 10.34 km3 of sediment along the margin. Regional-instabilities inventories are very useful quantifying the role of these processes in the geomorphologic evolution of one area but also constitute a first step towards the assessment of landslide-related hazard. In addition to size, other morphometric parameters such as scar length and sinuosity, head area, regional gradient, scar height and gradient have been included in the inventory to have a good selection of variables that characterize the instability events. Statistical analyses revealed that the cumulative distribution of the landslide size area can be characterized both by inverse power and log-normal distributions. In the first case, a partial fit is achieved explaining two orders of magnitude (major events) of the whole dataset. The log-normal function is adjusted to the entire sample events. This fact would lead to define both a characteristic event size determined by the geomorphological conditions and a variance linked to the characteristics of the main triggers that in the area would be the earthquakes 2024-08-16T10:50:06Z 2024-08-16T10:50:06Z 2023-07-14 2024-08-16T10:50:06Z comunicación de congreso XXI Inqua Congress (2023) http://hdl.handle.net/10261/365989 Sí none |
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XXI Inqua Congress, Time fort Change, 14-20 July 2023, Roma |
| format |
comunicación de congreso |
| author |
Retegui, Leire Casas, David Casalbore, Daniele Yenes, Mariano Nespereira, José Ercilla, Gemma Alonso, Belén Estrada, Ferran Chiocci, Francesco L. Idarraga, Javier Teixeira, Manuel Ramos, Jackeline |
| spellingShingle |
Retegui, Leire Casas, David Casalbore, Daniele Yenes, Mariano Nespereira, José Ercilla, Gemma Alonso, Belén Estrada, Ferran Chiocci, Francesco L. Idarraga, Javier Teixeira, Manuel Ramos, Jackeline Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| author_facet |
Retegui, Leire Casas, David Casalbore, Daniele Yenes, Mariano Nespereira, José Ercilla, Gemma Alonso, Belén Estrada, Ferran Chiocci, Francesco L. Idarraga, Javier Teixeira, Manuel Ramos, Jackeline |
| author_sort |
Retegui, Leire |
| title |
Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| title_short |
Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| title_full |
Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| title_fullStr |
Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| title_full_unstemmed |
Submarine sedimentary instabilities on the Palomares Continental Margin (W Mediterranean). Morphometry and distribution |
| title_sort |
submarine sedimentary instabilities on the palomares continental margin (w mediterranean). morphometry and distribution |
| publishDate |
2023-07-14 |
| url |
http://hdl.handle.net/10261/365989 |
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