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EMB Future Science Brief N°7 outlines the current state of our knowledge on the sources of anthropogenic sounds and the effects of noise on marine organisms. Moreover, it provides an overview of the measures that have been taken to address the issue of underwater noise. In order to develop proportionate mitigation strategies and effective regulation, we have to advance our knowledge about the effects of anthropogenic noise on marine organisms and their ecosystems.

This document presents the potential acoustic impact assessment on marine mammals of the MANTA-RAY scientific cruise., Ce document présente l’évaluation des risques sonores potentiels de la campagne scientifique MANTA-RAY sur les mammifères marins, et les mesures de protection proposées.

EMB Future Science Brief N°7 outlines the current state of our knowledge on the sources of anthropogenic sounds and the effects of noise on marine organisms. Moreover, it provides an overview of the measures that have been taken to address the issue of underwater noise. In order to develop proportionate mitigation strategies and effective regulation, we have to advance our knowledge about the effects of anthropogenic noise on marine organisms and their ecosystems.

EMB Future Science Brief N°7 outlines the current state of our knowledge on the sources of anthropogenic sounds and the effects of noise on marine organisms. Moreover, it provides an overview of the measures that have been taken to address the issue of underwater noise. In order to develop proportionate mitigation strategies and effective regulation, we have to advance our knowledge about the effects of anthropogenic noise on marine organisms and their ecosystems.

Ce document précise les mesures prises par l’Ifremer pour la protection de la faune marine lors de l’utilisation des sources sismiques appartenant à la classe 1 (> 500 in 3). Avant de présenter le protocole à appliquer lors des campagnes de géosciences marines, les principes de l’évaluation des risques sonores sont rappelés.

This document explains measures taken by Ifremer to protect marine fauna when using class 1 seismic sources (> 500 in3). Before presenting the protocol to be applied during marine geoscience campaigns, the acoustic risk assessment principles are recapped.

This document explains measures taken by Ifremer to protect marine fauna when using class 1 seismic sources (> 500 in3). Before presenting the protocol to be applied during marine geoscience campaigns, the acoustic risk assessment principles are recapped.

Ce document précise les mesures prises par l’Ifremer pour la protection de la faune marine lors de l’utilisation des sources sismiques appartenant à la classe 1 (> 500 in 3). Avant de présenter le protocole à appliquer lors des campagnes de géosciences marines, les principes de l’évaluation des risques sonores sont rappelés.

Ce document précise les mesures prises par l’Ifremer pour la protection de la faune marine lors de l’utilisation des sources sismiques appartenant à la classe 1 (> 500 in 3). Avant de présenter le protocole à appliquer lors des campagnes de géosciences marines, les principes de l’évaluation des risques sonores sont rappelés.

This document explains measures taken by Ifremer to protect marine fauna when using class 1 seismic sources (> 500 in3). Before presenting the protocol to be applied during marine geoscience campaigns, the acoustic risk assessment principles are recapped.

Ce document précise les mesures prises par l’Ifremer pour la protection de la faune marine lors de l’utilisation des sources sismiques appartenant à la classe 1 (> 500 in 3). Avant de présenter le protocole à appliquer lors des campagnes de géosciences marines, les principes de l’évaluation des risques sonores sont rappelés.

This document explains measures taken by Ifremer to protect marine fauna when using class 1 seismic sources (> 500 in3). Before presenting the protocol to be applied during marine geoscience campaigns, the acoustic risk assessment principles are recapped.

The structure and nature of the crust underlying the Camamu-Almada-Jequitinhonha-Sergipe-Alagoas basins System, in the NE Brazilian margin, were investigated based on the interpretation of 12 wide-angle seismic profiles acquired during the SALSA (Sergipe ALagoas Seismic Acquisition) experiment in 2014. In this work, we present two 220-km-long NW-SE combined wide-angle and reflection seismic profiles, SL 01 and SL 02, that have been acquired using 15 ocean-bottom-seismometers along each profile, offshore the southern part of the Sergipe Alagoas Basin (SAB), north of the Vaza-Barris Transfer zone. The SL 02 has a 150-km long inland continuation with 20 land-seismic-stations until the Sergipano Fold Belt (SFB). Wide-angle seismic forward modeling allows us to precisely divide the crust in three domains: beneath the continental shelf, a ∼100 km wide necking zone is imaged where the continental crust thins from ∼35 km on the Unthinned Continental Domain, which displays a three-layered crust structure, to less than 8 km on the Oceanic Crust Domain. In the necking zone, the upper and the middle layers thin dramatically and almost disappear, while the Moho discontinuity shows clear PmPs. The Continental-Oceanic Crust Boundary (COB) is located at ∼80 km from the coastline and is marked by intracrustal seismic reflectors and changes in the seismic velocity, showing a sharp transition. On profile SL02, the oceanic crust is perturbed by a volcanic edifice together with an anomalous velocity zone underneath the area.

The structure and nature of the crust underlying the Camamu-Almada-Jequitinhonha-Sergipe-Alagoas basins System, in the NE Brazilian margin, were investigated based on the interpretation of 12 wide-angle seismic profiles acquired during the SALSA (Sergipe ALagoas Seismic Acquisition) experiment in 2014. In this work, we present two 220-km-long NW-SE combined wide-angle and reflection seismic profiles, SL 01 and SL 02, that have been acquired using 15 ocean-bottom-seismometers along each profile, offshore the southern part of the Sergipe Alagoas Basin (SAB), north of the Vaza-Barris Transfer zone. The SL 02 has a 150-km long inland continuation with 20 land-seismic-stations until the Sergipano Fold Belt (SFB). Wide-angle seismic forward modeling allows us to precisely divide the crust in three domains: beneath the continental shelf, a ∼100 km wide necking zone is imaged where the continental crust thins from ∼35 km on the Unthinned Continental Domain, which displays a three-layered crust structure, to less than 8 km on the Oceanic Crust Domain. In the necking zone, the upper and the middle layers thin dramatically and almost disappear, while the Moho discontinuity shows clear PmPs. The Continental-Oceanic Crust Boundary (COB) is located at ∼80 km from the coastline and is marked by intracrustal seismic reflectors and changes in the seismic velocity, showing a sharp transition. On profile SL02, the oceanic crust is perturbed by a volcanic edifice together with an anomalous velocity zone underneath the area.

The structure and nature of the crust underlying the Camamu-Almada-Jequitinhonha-Sergipe-Alagoas basins System, in the NE Brazilian margin, were investigated based on the interpretation of 12 wide-angle seismic profiles acquired during the SALSA (Sergipe ALagoas Seismic Acquisition) experiment in 2014. In this work, we present two 220-km-long NW-SE combined wide-angle and reflection seismic profiles, SL 01 and SL 02, that have been acquired using 15 ocean-bottom-seismometers along each profile, offshore the southern part of the Sergipe Alagoas Basin (SAB), north of the Vaza-Barris Transfer zone. The SL 02 has a 150-km long inland continuation with 20 land-seismic-stations until the Sergipano Fold Belt (SFB). Wide-angle seismic forward modeling allows us to precisely divide the crust in three domains: beneath the continental shelf, a ∼100 km wide necking zone is imaged where the continental crust thins from ∼35 km on the Unthinned Continental Domain, which displays a three-layered crust structure, to less than 8 km on the Oceanic Crust Domain. In the necking zone, the upper and the middle layers thin dramatically and almost disappear, while the Moho discontinuity shows clear PmPs. The Continental-Oceanic Crust Boundary (COB) is located at ∼80 km from the coastline and is marked by intracrustal seismic reflectors and changes in the seismic velocity, showing a sharp transition. On profile SL02, the oceanic crust is perturbed by a volcanic edifice together with an anomalous velocity zone underneath the area.