A5020190643- Geology and Paleoclimatology Research
- Geological formations and processes
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Coastal and Marine Dynamics
- Geological and Geophysical Studies
- Geological and Geophysical Studies Worldwide
- Maritime and Coastal Archaeology
- Paleontology and Stratigraphy of Fossils
- Geological and Geochemical Analysis
- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Underwater Acoustics Research
- Aeolian processes and effects
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Coral and Marine Ecosystems Studies
- Landslides and related hazards
- Coastal and Marine Management
- Isotope Analysis in Ecology
- Island Studies and Pacific Affairs
- Migration, Aging, and Tourism Studies
- Hydrological Forecasting Using AI
- Coastal wetland ecosystem dynamics
- Geophysical Methods and Applications
Instituto Hidrográfico
2016-2024
University of Lisbon
2014-2024
Instituto Dom Luiz
2020
Portuguese Sea and Atmosphere Institute
2013-2016
National Laboratory of Energy and Geology
2010-2013
National Institute of Engineering, Technology and Innovation
2008
Research Article| March 01, 2017 Emergence and evolution of Santa Maria Island (Azores)—The conundrum uplifted islands revisited Ricardo S. Ramalho; Ramalho † 1School Earth Sciences, University Bristol, Wills Memorial Building, Queen's Road, BS8 1RJ, UK2Lamont-Doherty Observatory at Columbia University, Comer Geochemistry 61 Route 9W/P.O. Box 1000, Palisades, New York 10964-8000, USA †ric.ramalho@bristol.ac.uk Search for other works by this author on: GSW Google Scholar George Helffrich;...
Giant tsunami triggered by catastrophic flank collapse of Fogo volcano.
The extents of volcanic island shelves result from surf erosion, which enlarges them, and progradation, reduces them. However, mass‐wasting, tectonics sediment deposition also contribute to their morphology. In order assess the relative significance these various processes, we have mapped in detail Faial Island's shelf Azores archipelago based on interpretation geophysical geological data. nearshore substrates island, down 30–50 m depth, are rocky covered by volcaniclastic boulder deposits...
Abstract Shelves from volcanic ocean islands result the competition between two main processes, wave erosion that forms and enlarges them progradation reduces their dimension. In places where dominates over volcanism, shelf width can be used as a proxy for relative age of subaerial edifices reconstruction extents prior to achieved. this study, new multibeam bathymetry high‐resolution seismic reflection profiles are exploited characterize morphology insular shelves adjacent each edifice...
ABSTRACT A synthetic model is presented to enlarge the evolutionary framework of General Dynamic Model (GDM) and Glacial Sensitive (GSM) oceanic island biogeography from terrestrial marine realm. The proposed ‘Sea‐Level Sensitive’ dynamic (SLS) integrates historical ecological with patterns glacio‐eustasy, merging concepts areas as diverse taxonomy, biogeography, biology, volcanology, sedimentology, stratigraphy, palaeontology, geochronology geomorphology. Fundamental SLS variation littoral...
Abstract Oceanic islands – such as the Azores in mid‐North Atlantic are periodically exposed to large storms that often remobilize and transport marine sediments along coastlines, into deeper environments. Such disruptive events create deposits denominated tempestites whose characteristics reflect highly dynamic environment which they were formed. Tempestites from oceanic islands, however, seldom described literature little is known about storm‐related sediment dynamics affecting island...
Abstract Shelves surrounding reefless volcanic ocean islands are formed by surf erosion of their slopes during changing sea levels. Posterosional lava flows, if abundant, can cross the coastal cliffs and fill partially or completely accommodation space left erosion. In this study, multibeam bathymetry, high‐resolution seismic reflection profiles, sediment samples used to characterize morphology insular shelves adjacent Pico Island. The data show offshore fresh flow morphologies, as well an...
Bathymetry data collected with a multibeam echo sounder around Pico Island, Azores (Portugal), reveal remarkable series of lava flows on the island's shelf variety pristine structures that suggest how behaves entering water. Many are dendritic in plan view, some channels and tumuli. Dendritic geometries interpreted to arise from flow fronts repeatedly arrested by enhanced cooling magma pressure subsequently causing new breakouts. Cascades elongated fingers also occur, individual comparable...
Abstract The Pleistocene (Eemian) outcrops of Lagoinhas and Prainha, located at Santa Maria Island (Azores), were investigated their fossil mollusc content reported. These studies revealed that the last glaciation affected two groups molluscs: ‘warm‐guest’ gastropods with West African or Caribbean affinities (e.g. Conus spp., Cantharus variegatus, Bulla amygdala, Trachypollia nodulosa ) shallow bivalve species mainly associated sandy habitats ( Ensis minor, Lucinella divaricata , probably...
Abstract A comparative analysis of bedform fields along the submarine flanks insular volcanoes, characterized by different morpho‐structural settings, volcanic and meteo‐marine regimes (Vanuatu, Kermadec, Bismark, Madeira Aeolian archipelagos), is presented here to provide insights on size distribution, morpho‐dynamic genesis such bedforms. Two main types bedforms are recognized according their size, location preconditioning/triggering processes. Small‐scale have wavelengths tens hundreds...
High-resolution morpho-bathymetric data at 1:200,000 scale obtained during the FAIVI cruise (2011) and resulting geomorphologic map of Terceira island offshore area (central Azores, Portugal) are presented for first time. The uneven morphology around is primarily related to volcanic features, such as linear cone-shaped eruptive centres lava flows. Such features mostly concentrated on ridges aligned along preferential axes, suggesting a strong interaction between tectonics processes....
It is now widely accepted that shelves of reefless volcanic islands form essentially by wave erosion the island slopes over periods can encompass many glacial-interglacial cycles and thus varied sea levels [Llanes et al., 2009; Menard, 1983, 1986; Quartau 2010; Romagnoli, 2013]. Menard [1986] was first scientist to draw our attention correlation between age shelf width in contrast lack depth break. Furthermore, observations windward sides have commonly wider than leeward sides, despite no...
Abstract Small landslides in the upper submarine slopes of volcanic islands present potential hazards locally because their high frequency. We examine evidence for landsliding high‐resolution bathymetric data from Faial, Pico, São Jorge, and Terceira Azores. Because rugged morphology makes difficult to interpret, we develop two classification schemes 1,227 identified slope valleys. One scheme addresses how recognizable valleys were as originating (whether scarps are prominent or indefinite),...