The Experts below are selected from a list of 20988 Experts worldwide ranked by ideXlab platform
P Lamare - One of the best experts on this subject based on the ideXlab platform.
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Distributed sensing of earthquakes and ocean-solid Earth interactions on seafloor telecom cables
Nature Communications, 2019Co-Authors: Anthony Sladen, D Rivet, J Ampuero, L De Barros, Y Hello, G Calbris, P LamareAbstract:Two thirds of the surface of our planet are covered by water and are still poorly instrumented, which has prevented the earth science community from addressing numerous key scientific questions. The potential to leverage the existing fiber optic seafloor telecom cables that crisscross the oceans, by using them as dense arrays of seismo-acoustic sensors, remains to be evaluated. Here, we report Distributed Acoustic Sensing measurements on a 41.5 km-long telecom cable that is deployed offshore Toulon, France. Our observations demonstrate the capability to monitor with unprecedented details the ocean-solid earth interactions from the coast to the abyssal plain, in addition to regional Seismicity (e.g., a magnitude 1.9 microearthquake located 100 km away) with signal characteristics comparable to those of a coastal Seismic Station.
Anthony Sladen - One of the best experts on this subject based on the ideXlab platform.
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Distributed sensing of earthquakes and ocean-solid Earth interactions on seafloor telecom cables
Nature Communications, 2019Co-Authors: Anthony Sladen, D Rivet, J Ampuero, L De Barros, Y Hello, G Calbris, P LamareAbstract:Two thirds of the surface of our planet are covered by water and are still poorly instrumented, which has prevented the earth science community from addressing numerous key scientific questions. The potential to leverage the existing fiber optic seafloor telecom cables that crisscross the oceans, by using them as dense arrays of seismo-acoustic sensors, remains to be evaluated. Here, we report Distributed Acoustic Sensing measurements on a 41.5 km-long telecom cable that is deployed offshore Toulon, France. Our observations demonstrate the capability to monitor with unprecedented details the ocean-solid earth interactions from the coast to the abyssal plain, in addition to regional Seismicity (e.g., a magnitude 1.9 microearthquake located 100 km away) with signal characteristics comparable to those of a coastal Seismic Station.
Jordi Julia - One of the best experts on this subject based on the ideXlab platform.
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crustal and lithospheric structure of inactive volcanic arc terrains in fiji
Tectonophysics, 2019Co-Authors: Jie Chen, Jordi Julia, Yongshun John Chen, Douglas A Wiens, Shawn S Wei, Yang Zha, Chen CaiAbstract:Abstract The crustal and lithospheric velocity structure of the Fiji area may place important constraints on the evolution of island arcs in the region. Here, we obtain receiver functions from one permanent Seismic Station and three temporary networks on the Fiji Platform, the Lau Ridge, and other small islands to develop point estimates of crustal thickness under the networks. We obtain preliminary estimates of crustal thickness and Poisson's ratio from H-κ stacking of the receiver functions. We then perform an inversion for shear-wave velocity structure using a joint inversion of receiver functions and Rayleigh wave dispersion curves from ambient Seismic noise and teleSeismic events. The joint inversion results show an average crustal thickness of ~30 km beneath Viti Levu, the largest Fiji island, suggesting an extensive period of arc crustal formation and thickening. In contrast, we find shallower Moho depths averaging ~22 km beneath the smaller Fiji islands and the Lau Ridge. The limited thickness of the high velocity lid obtained by inversion indicates that the lithosphere is thinned beneath the marginal Fiji islands, which may be due to the early rifting event forming the Lau Basin together with the crustal thinning of this area as well, and to thermal lithospheric erosion processes associated with adjacent back-arc spreading. A relatively slow velocity middle crustal layer, roughly of 11–16 km thickness, exists throughout Fiji, suggesting that remnant arcs contain significant volumes of felsic crustal rocks necessary for continental crust formation.
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Lithospheric and sublithospheric deformation under the Borborema Province of northeastern Brazil from receiver function harmonic stripping
Solid Earth, 2019Co-Authors: Gaelle Lamarque, Jordi JuliaAbstract:The depth-dependent anisotropic structure of the lithosphere under the Borborema Province in northeast Brazil has been investigated via harmonic stripping of receiver functions developed at 39 Stations in the region. This method retrieves the first (k = 1) and second (k = 2) degree harmonics of a receiver function dataset, which characterize Seismic anisotropy beneath a Seismic Station. Anisotropic fabrics are in turn directly related to the deformation of the lithosphere from past and current tectonic processes. Our results reveal the presence of anisotropy within the crust and the lithospheric mantle throughout the entire province. Most Stations in the continental interior report consistent anisotropic orientations in the crust and lithospheric mantle, suggesting a dominant northeast-southwest pervasive deformation along lithospheric-scale shear zones developed during the Brasiliano-Pan-African orogeny. Several Stations aligned along a northeast-southwest trend located above the (now aborted) Mesozoic Cariri-Potiguar rift display large uncertainties for the fast-axis direction. This nonazimuthal anisotropy may be related to a complex anisotropic fabric resulting from a combination of deformation along the ancient collision between Precambrian blocks, Mesozoic extension and thermomechanical erosion dragging by sublithospheric flow. Finally, several Stations along the Atlantic coast reveal depth-dependent anisotropic orientations roughly (sub)perpendicular to the margin. These results suggest a more recent overprint, probably related to the presence of frozen anisotropy in the lithosphere due to stretching and rifting during the opening of the South Atlantic.
L De Barros - One of the best experts on this subject based on the ideXlab platform.
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Distributed sensing of earthquakes and ocean-solid Earth interactions on seafloor telecom cables
Nature Communications, 2019Co-Authors: Anthony Sladen, D Rivet, J Ampuero, L De Barros, Y Hello, G Calbris, P LamareAbstract:Two thirds of the surface of our planet are covered by water and are still poorly instrumented, which has prevented the earth science community from addressing numerous key scientific questions. The potential to leverage the existing fiber optic seafloor telecom cables that crisscross the oceans, by using them as dense arrays of seismo-acoustic sensors, remains to be evaluated. Here, we report Distributed Acoustic Sensing measurements on a 41.5 km-long telecom cable that is deployed offshore Toulon, France. Our observations demonstrate the capability to monitor with unprecedented details the ocean-solid earth interactions from the coast to the abyssal plain, in addition to regional Seismicity (e.g., a magnitude 1.9 microearthquake located 100 km away) with signal characteristics comparable to those of a coastal Seismic Station.
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Distributed sensing of earthquakes and ocean-solid Earth interactions on seafloor telecom cables
HAL CCSD, 2019Co-Authors: Sladen Anthony, L De Barros, Rivet Diane, Ampuero, Jean Paul, Hello Yann, Calbris G., Lamare P.Abstract:International audienceTwo thirds of the surface of our planet are covered by water and are still poorly instrumented, which has prevented the earth science community from addressing numerous key scientific questions. The potential to leverage the existing fiber optic seafloor telecom cables that criss-cross the oceans, by using them as dense arrays of seismo-acoustic sensors, remains to be evaluated. Here, we report Distributed Acoustic Sensing measurements on a 41.5 km-long telecom cable that is deployed offshore Toulon, France. Our observations demonstrate the capability to monitor with unprecedented details the ocean-solid earth interactions from the coast to the abyssal plain, in addition to regional Seismicity (e.g., a magnitude 1.9 micro-earthquake located 100 km away) with signal characteristics comparable to those of a coastal Seismic Station
Y Hello - One of the best experts on this subject based on the ideXlab platform.
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Distributed sensing of earthquakes and ocean-solid Earth interactions on seafloor telecom cables
Nature Communications, 2019Co-Authors: Anthony Sladen, D Rivet, J Ampuero, L De Barros, Y Hello, G Calbris, P LamareAbstract:Two thirds of the surface of our planet are covered by water and are still poorly instrumented, which has prevented the earth science community from addressing numerous key scientific questions. The potential to leverage the existing fiber optic seafloor telecom cables that crisscross the oceans, by using them as dense arrays of seismo-acoustic sensors, remains to be evaluated. Here, we report Distributed Acoustic Sensing measurements on a 41.5 km-long telecom cable that is deployed offshore Toulon, France. Our observations demonstrate the capability to monitor with unprecedented details the ocean-solid earth interactions from the coast to the abyssal plain, in addition to regional Seismicity (e.g., a magnitude 1.9 microearthquake located 100 km away) with signal characteristics comparable to those of a coastal Seismic Station.