9 documents found, page 1 of 1
Paleolitorais submersos e emersos no Algarve Central (Portugal)
Teixeira, Sebastiao; Pinto, Celso; Rosa, MarcosRESUMO: Apresentam-se os resultados da prospecção da zona submarina ao largo do Algarve Central, até à batimétrica dos 30m, a partir da utilização de sonar de varrimento lateral, ecossonda monofeixe, observação em mergulho com escafandro autónomo, complementado com colheita de amostras superficiais. Foram identificadas duas estruturas submarinas com desenvolvimento linear, cujo topo atinge a profundidade de -15...
Vulnerable marine ecosystems survey pilot missions with EVA Hybrid AUV/ROV
Almeida, Carlos; Martins, Alfredo; Soares, Eduardo; Santos, A. Miguel P.; Matias, Bruno; Silva, Pedro; Pereira, Ricardo; Sytnyk, DenysFishing for deep-sea species occurs on continental slopes, ridges, and seamounts. Fishing operations using fishing gears that contact the bottom (e.g., trawls and bottom longlines) may have significant impacts on Vulnerable Marine Ecosystems (VMEs). VMEs refer to marine ecosystems with a population or community of sensitive taxa or habitats that are likely to experience substantial alteration from short-term to...
Relatório da Campanha de Mar “SAT_UHRS_2022”
Brito, Pedro; Noiva, João; Rosa, Marcos; Batista, Luís; Terrinha, PedroThis report describes the activities of the SAT_UHRS_2022 sea campaign carried out from May 10 to 15, 2022, aboard the RV Diplodus, operating from the port of Sesimbra. The main objective of this campaign was to carry out sea acceptance tests (SAT) for new components that were recently integrated into the ultra-high resolution seismic (UHRS) reflection data acquisition system of the Marine Geophysics Laboratory...
High-Resolution Marine Magnetic Mapping of the Portuguese Nearshore: Unraveling...
Neres, Marta; Terrinha, Pedro; Brito, Pedro; Rosa, Marcos; Noiva, João; Magalhães, Vítor; Silva, Mariana; Batista, Luis; Teixeira, ManuelThe SW Portuguese margin has been intensively studied, particularly for rifting, tectonic inversion and tectonic reactivation of the Atlantic passive margin. In this work we bring new data on the continental shelf, usually not acquired by the heavier geophysical methods (e.g. airborne or low resolution deep seismic-magnetic surveys). These new data allow casting a clear light bridging between the geological str...
Multi-scale and multi-disciplinary investigation of the southwest Portuguese Co...
Terrinha, Pedro; Ribeiro, Carlos; Noiva, João; Rosa, Marcos; Brito, Pedro; Magalhães, Vítor; Neres, Marta; Nogueira, Pedro; Velez, SandraThe MINEPLAT project (Assessment of the mineral resources potential in the continental shelf of Alentejo and of the environmental conditions caused by the tectonic uplift in the PlioceneQuaternary) allowed acquisition of 1700 km of ultra- high resolution seismic profiles, and full coverage of multibeam bathymetry and acoustic backscatter of 1450 km2 and 1940km of magnetic data of the Alentejo continental shelf,...
Nature and origin of gas trapped in sediments in the Tagus River ebb-delta, off...
Ribeiro, Carlos; Terrinha, Pedro; Rosa, Marcos; Neres, Marta; Noiva, João; Brito, Pedro; Magalhães, VítorThe Tagus River ebb-delta is located near an important city center off Lisbon, Portugal. The Tagus delta hosts various kilometer scale landslides, the most important of which has been mapped and described with a presumable age of ~11 ky and 10 km in length, 4 km wide and 20 m of maximum thickness. An equivalent area of gas trapped in the sediments has also been reported (Terrinha et al., 2019). The TAGUSGAS pro...
Integrated thematic geological mapping of the Atlantic Margin of Iberia.
Terrinha, Pedro; Medialdea, Teresa; Batista, Luís; Somoza, Luis; Magalhães, Vítor; González, Francisco Javier; Noiva, João; Lobato, Ana; Rosa, MarcosThis paper synthesizes the geology of the Atlantic Margin off the coast of Iberia and surrounding Abyssal Plains using published thematic mapping freely downloadable from EMODNET-Geology portal at different scales. Selected information was chosen in order to highlight mineral occurrences and natural hazards overlaid on geological and morphological maps. Altogether, this information is published and interpreted ...
Cataloguing Quaternary paleo-coastlines in West and Southwest Portugal. Economi...
Ribeiro, Carlos; Terrinha, Pedro; Brito, Pedro; Noiva, João; Rosa, Marcos; Batista, Luis; Neres, Marta; Magalhães, VitorA catalogue of paleo-coast lines in Southwest and South Portugal is presented based on direct field observation and on recent multibeam and backscatter bathymetric surveys. Above sea level, coastline classification was based on field observation of i) wave cut platforms directly associated with ii) notches and/or marine sand deposits with shell clasts, iii) speleothems interbedded with sand deposits and iv) bea...
The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine ...
Terrinha, Pedro; Duarte, Henrique; Brito, Pedro; Noiva, João; Ribeiro, Carlos; Omira, Rachid; Baptista, Maria Ana Carvalho Viana; Miranda, MiguelThe stratigraphy of the Tagus river ebb-tidal delta off Lisbon (Portugal) is investigated using high resolution multichannel seismic reflection profiles with the purpose of searching for sedimentary or erosive features associated with landslides. The Tagus delta is sub-divided in two prograding seismic units of 17 ky to 13 ky and 13 ky to Present based on the calibration of seismic lines using gravity and box-c...