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Jean-Yves Royer
Centre national de la recherche scientifique
Seafloor spreadingPlate tectonicsGeologySeismologyGeophysics
80Publications
12H-index
871Citations
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Publications 61
Newest
#1Pierre SakicH-Index: 2
#2Valérie BalluH-Index: 16
Last. Jean-Yves RoyerH-Index: 12
view all 3 authors...
Monitoring deformation on the seafloor is a major challenge for modern geodesy and a key to better understanding tectonic processes and assess related hazards. The extension of the geodetic networks offshore can be achieved by combining satellite positioning (GNSS) of a surface platform with acoustic ranging to seafloor transponders. This approach is called GNSS-Acoustic (GNSS-A). The scope of this work is to provide a tool to identify and quantify key points in the error budget of such experime...
Source
#1Maelle Torterotot (CNRS: Centre national de la recherche scientifique)
#2Flore Samaran (CNRS: Centre national de la recherche scientifique)H-Index: 7
Last. Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
view all 3 authors...
The Southern Indian Ocean is a seasonal habitat for different blue whale sub species and sub populations. Their presence has been demonstrated by continuous acoustic records from the OHASISBIO hydrophone network, deployed since 2010 and which comprises 5 to 9 fixed mooring sites spread over a region from 24 deg to 56 deg South and from 52 deg to 83 deg East. Automated detection based on dictionaries and sparse representation has been used to detect and count the different stereotyped or non-ster...
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#1Jean Lecoulant (CNRS: Centre national de la recherche scientifique)
#2Claude Guennou (CNRS: Centre national de la recherche scientifique)H-Index: 1
Last. Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
view all 4 authors...
The low-frequency (4–40 Hz) acoustic waves generated by undersea earthquakes are of great importance to monitor the low-level seismic activity associated with seafloor spreading ridges. To better understand the near-source interaction of seismic waves with the seafloor and the resulting generation of low-frequency acoustic waves, the wave propagation in a solid medium (the Earth's crust) and in the overlaying fluid medium (the ocean) were jointly simulated using a three-dimensional (3D) spectral...
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#1Dietrich LangeH-Index: 14
#2Heidrun Kopp (CAU: University of Kiel)H-Index: 24
Last. Louis Géli ('IFREMER': IFREMER)H-Index: 27
view all 12 authors...
Using offshore geodetic observations, we show that a segment of the North Anatolian Fault in the central Sea of Marmara is locked and therefore accumulating strain. The strain accumulation along this fault segment was previously extrapolated from onshore observations or inferred from the absence of seismicity, but both methods could not distinguish between fully locked or fully creeping fault behavior. A network of acoustic transponders measured crustal deformation with mm-precision on the seafl...
1 CitationsSource
#1Maelle Torterotot (CNRS: Centre national de la recherche scientifique)
#2Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
Last. Flore Samaran (CNRS: Centre national de la recherche scientifique)H-Index: 7
view all 3 authors...
The most common approach to monitor mysticete acoustic presence is to detect and count their calls in audio records. To implement this method on large datasets, polyvalent and robust automated call detectors are required. Evaluating their performance is essential, to design a detection strategy adapted to study the available datasets. This assessment then enables accurate post-analyses and comparisons of multiple independent surveys. In this paper, we present the performance of a detector based ...
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#1Yann Hello (CNRS: Centre national de la recherche scientifique)H-Index: 29
#2Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
Last. Olivier Philippe (CNRS: Centre national de la recherche scientifique)
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Long-term monitoring of the ocean, for instance its seismic activity, remains a technical and a financial challenge. Despite technological advances in reducing the size and consumption of electronic components, in providing powerful energy through Lithium batteries, and in reducing the size of sensors, the new generation of stand-alone instruments such as Ocean Bottom Seismometers (OBS) cannot be deployed on average for more than a year on the seafloor and provide access to their data only upon ...
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#2Claude Guennou (CNRS: Centre national de la recherche scientifique)H-Index: 1
Last. Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
view all 4 authors...
The generation of low-frequency (≤40 Hz) acoustic waves (T-waves) by undersea earthquakes below a flat abyssal plain is not yet fully understood. To model the generation and propagation of PN-waves (horizontally in the crust and vertically in the ocean) and of T-waves over a rough sea bottom, we use a 2D spectral finite-element code (SPECFEM2D). The model includes a solid layer (Earth crust) overlain by a fluid ocean, and separated by a sinusoidal crust/water interface (seafloor roughness). Synt...
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#1Vaddakeyakath Yatheesh (National Institute of Oceanography, India)H-Index: 1
#2Jérôme Dyment (IPGP: Institut de Physique du Globe de Paris)H-Index: 27
Last. Yanghee Choi (IPGP: Institut de Physique du Globe de Paris)H-Index: 1
view all 10 authors...
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#1Flore Samaran (CNRS: Centre national de la recherche scientifique)H-Index: 7
#2Adrien Berne (CNRS: Centre national de la recherche scientifique)H-Index: 1
Last. Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
view all 7 authors...
1 CitationsSource
#1Marc-André Gutscher (CNRS: Centre national de la recherche scientifique)H-Index: 37
#2Jean-Yves Royer (CNRS: Centre national de la recherche scientifique)H-Index: 12
Last. Laura BeranzoliH-Index: 16
view all 17 authors...
Laser reflectometry (BOTDR), commonly used for structural health monitoring (bridges, dams, etc.), will for the first time be applied to study movements of an active fault on the seafloor 25 km offshore Catania Sicily. The goal of the European funded FOCUS project (ERC Advanced Grant) is to connect a 6-km long strain cable to the EMSO seafloor observatory in 2100 m water depth. Laser observations will be calibrated by seafloor geodetic instruments and seismological stations. A long-term goal is ...
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