Figure 5 - uploaded by Inês Martins
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ADCP data collected from the first period of deployment of the deep MONICAN buoy. From top to bottom: current speed, current direction, echo intensity and percentage of good data with a 4 beam solution.
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In 2002 the Portuguese hydrographic office Institute Hidrografico (IHPT) started a program of monitoring of the largest submarine canyon of the European margin: Nazare Canyon. Since it incises a rather sensible continental margin, characterized by the presence of a protected area for marine life (Berlengas marine reserve), the proximity of importan...
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... addition, current speed and direction and velocity error are sent in real time for a total of 7 ADCP bins. The data collected from the first period of deployment of the deep MONICAN buoy are illustrate on figure 5 and is consistent in a 100m of water column. The percent good confirms that the mooring is stable and the movements of the buoy on the surface don't influence significantly the optimal angle for the ADCP optimal measurements. ...
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... Over the last ∼ 500 years of historical written archives in the Lesser Antilles, a few dozen confirmed tsunamis from different origins (local, regional or far-field sources including earthquakes, landslides, volcanic eruptions or combinations of them) have been reported. Starting with the 16 April 1690 M s ∼ 8.0 Barbados earthquake (which presumably triggered the first reported tsunami in the Lesser Antilles), it includes the widely studied 1 November 1755 Lisbon transoceanic tsunami (e.g., Gutscher et al., 2006;Accary and Roger, 2010;Roger et al., 2010Roger et al., , 2011Martínez-Loriente et al., 2021) and the 18 November 1867 Virgin Islands tsunami (e.g., Zahibo et al., 2003Zahibo et al., , 2005Barkan and ten Brink, 2010). Landslide sources or pyroclastic flows are also known for their tsunamigenic potential. ...
In this study, alternatively to the megathrust, we identify upper-plate normal faults orthogonal to the trench as a possible tsunami source along the Lesser Antilles subduction zone. The Morne Piton fault system is such a trench-perpendicular upper crustal fault at the latitude of Guadeloupe. By means of seismic reflection, high-resolution bathymetry, remotely operated vehicle (ROV) imaging and dating, we reassess the slip rate of the Morne Piton fault since 7 Ma, i.e., its inception, and quantify an average rate of 0.25 mm yr-1 since ca. 1.2 Ma. This result divides by two previous estimations, increases the earthquake time recurrence and lowers the associated hazard. The ROV dive revealed a metric scarp with striae at the toe of the Morne Piton fault system, suggesting a recent fault rupture. We estimate a fault rupture area of ∼ 450–675 km2 and then a magnitude range for a maximum seismic event around Mw 6.5 ± 0.5, making this fault potentially tsunamigenic as the nearby Les Saintes fault responsible for a tsunami following the 2004 Mw 6.3 earthquake. Consequently, we simulate a multi-segment tsunami model representative of a worst-case scenario if all the identified Morne Piton fault segments ruptured together. Our model provides clues for the potential impact of local tsunamis on the surrounding coastal area as well as for local bathymetric controls on tsunami propagation. We illustrate that (i) shallow-water plateaus act as secondary sources and are responsible for a wrapping of the tsunami waves around the island of Marie-Galante; (ii) canyons indenting the shallow-water plateau slope break focus and enhance the wave height in front of the most touristic and populated town of the island; and (iii) the resonance phenomenon is observed within the Les Saintes archipelago, showing that the waves' frequency content is able to perturb the sea level for many hours after the seismic rupture.
... Although, algal 2 performed very well in this oceanographic region and season, it displayed a low performance for the match-ups of the GC10 cruise ( Fig. 7-b). Samples from the GC10 cruise have in situ Chl values greater than 10 mg m −3 due to the input of nutrients by river runoff and upwelling favorable conditions (Guerreiro et al., 2013;Martins, Vitorino, & Almeida, 2010). These samples were characterized by high phytoplankton absorption, and a phytoplankton community dominated by diatoms and coccolithophores (Brito et al., 2015;Guerreiro et al., 2013), which may explain the poor agreement for these match-ups. ...
... Deriving universal patterns of canyon processes and characteristics will require such integrated research efforts to be repeated in several canyons, for several tectonic and environmental settings. To achieve comparable results, the submarine canyon research community will have to work towards comparable and compatible methodologies, including the set-up of (or continuation of) longterm monitoring programmes to assess the temporal aspects of canyon processes (Juniper et al., 2013;Martins et al., 2010). Understanding the scale (both spatial and temporal) at which canyon processes shape the canyon environment is key to understanding the biological and ecological patterns. ...
