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L. Sandri - One of the best experts on this subject based on the ideXlab platform.
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relation between subduction megathrust earthquakes trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:[1] Giant earthquake (moment magnitude Mw ≥ 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (≥1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years.
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Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:Giant earthquake (moment magnitude M-w >= 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (>= 1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years. Citation: Heuret, A., C. P. Conrad, F. Funiciello, S. Lallemand, and L. Sandri (2012), Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain, Geophys. Res. Lett., 39, L05304, doi: 10.1029/2011GL050712.
Arnauld Heuret - One of the best experts on this subject based on the ideXlab platform.
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relation between subduction megathrust earthquakes trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:[1] Giant earthquake (moment magnitude Mw ≥ 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (≥1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years.
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Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:Giant earthquake (moment magnitude M-w >= 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (>= 1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years. Citation: Heuret, A., C. P. Conrad, F. Funiciello, S. Lallemand, and L. Sandri (2012), Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain, Geophys. Res. Lett., 39, L05304, doi: 10.1029/2011GL050712.
Karsten Gohl - One of the best experts on this subject based on the ideXlab platform.
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GlobSed: Updated total Sediment Thickness in the World’s oceans
Geochemistry Geophysics Geosystems, 2019Co-Authors: Eivind O. Straume, Joanne M. Whittaker, Carmen Gaina, Sergei Medvedev, Katharina Hochmuth, Karsten Gohl, R. Abdul Fattah, J.c. Doornenbal, John R. HopperAbstract:We present GlobSed, a new global 5‐arc‐minute total Sediment Thickness grid for the world's oceans and marginal seas. GlobSed covers a larger area than previously published global grids and incorporates updates for the NE Atlantic, Arctic, Southern Ocean, and Mediterranean regions, which results in a 29.7% increase in estimated total oceanic Sediment volume. We use this new global grid and a revised global oceanic lithospheric age grid to assess the relationship between the total Sediment Thickness and age of the underlying oceanic lithosphere and its latitude. An analytical approximation model is used to mathematically describe Sedimentation trends in major oceanic basins and to allow paleobathymetric reconstructions at any given geological time. This study provides a much‐needed update of the Sediment Thickness distribution of the world oceans and delivers a model for Sedimentation rates on oceanic crust through time that agrees well with selected drill data used for comparison.
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globsed updated total Sediment Thickness in the world s oceans
Geochemistry Geophysics Geosystems, 2019Co-Authors: Eivind O. Straume, Joanne M. Whittaker, Carmen Gaina, Sergei Medvedev, Katharina Hochmuth, Karsten Gohl, J.c. Doornenbal, Abdul R Fattah, John R. HopperAbstract:We present GlobSed, a new global 5‐arc‐minute total Sediment Thickness grid for the world's oceans and marginal seas. GlobSed covers a larger area than previously published global grids and incorporates updates for the NE Atlantic, Arctic, Southern Ocean, and Mediterranean regions, which results in a 29.7% increase in estimated total oceanic Sediment volume. We use this new global grid and a revised global oceanic lithospheric age grid to assess the relationship between the total Sediment Thickness and age of the underlying oceanic lithosphere and its latitude. An analytical approximation model is used to mathematically describe Sedimentation trends in major oceanic basins and to allow paleobathymetric reconstructions at any given geological time. This study provides a much‐needed update of the Sediment Thickness distribution of the world oceans and delivers a model for Sedimentation rates on oceanic crust through time that agrees well with selected drill data used for comparison.
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Preglacial to glacial Sediment Thickness grids for the southern Pacific Margin of West Antarctica
Geochemistry Geophysics Geosystems, 2016Co-Authors: Ansa Lindeque, Karsten Gohl, Florian Wobbe, Gabriele Uenzelmann-nebenAbstract:Circum-Antarctic Sediment Thickness grids provide constraints for basin evolution and paleotopographic reconstructions, which are important for paleo-ice sheet formation histories. By compiling old and new seismic data, we identify sequences representing pre-glacial, transitional and full glacial deposition processes along the Pacific margin of West Antarctica. The pre-glacial Sediment grid depicts 1.3 to 4.0 km thick depocenters, relatively evenly distributed along the margin. The depocenters change markedly in the transitional phase at, or after, the Eocene/Oligocene boundary, when the first major ice sheets reached the shelf. Full glacial sequences, starting in the middle Miocene, indicate new depocenter formation North of the Amundsen Sea Embayment and localized eastward shifts in the Bellingshausen Sea and Antarctic Peninsula basins. Using present-day drainage paths and source areas on the continent, our calculations indicate an estimated observed total Sedimentary volume of ∼10 x 106 km3 was eroded from West Antarctica since the separation of New Zealand in the Late Cretaceous. Of this 4.9 x 106 km3 predates the onset of glaciation and need to be considered for a paleotopography reconstruction of 34 Ma. Whereas 5.1 x 106 km3 postdate the onset of glaciation, of which 2.5 x 106 km3 were deposited in post mid-Miocene full glacial conditions. This article is protected by copyright. All rights reserved.
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Anomalous South Pacific lithosphere dynamics derived from new total Sediment Thickness estimates off the West Antarctic margin
Global and Planetary Change, 2014Co-Authors: Florian Wobbe, Ansa Lindeque, Karsten GohlAbstract:Abstract Paleotopographic models of the West Antarctic margin, which are essential for robust simulations of paleoclimate scenarios, lack information on Sediment Thickness and geodynamic conditions, resulting in large uncertainties. A new total Sediment Thickness grid spanning the Ross Sea–Amundsen Sea–Bellingshausen Sea basins is presented and is based on all the available seismic reflection, borehole, and gravity modeling data offshore West Antarctica. This grid was combined with NGDC's global 5 arc minute grid of ocean Sediment Thickness (Whittaker et al., 2013) and extends the NGDC grid further to the south. Sediment Thickness along the West Antarctic margin tends to be 3–4 km larger than previously assumed. The Sediment volume in the Bellingshausen, Amundsen, and Ross Sea basins amounts to 3.61, 3.58, and 2.78 million km 3 , respectively. The residual basement topography of the South Pacific has been revised and the new data show an asymmetric trend over the Pacific–Antarctic Ridge. Values are anomalously high south of the spreading ridge and in the Ross Sea area, where the topography seems to be affected by persistent mantle processes. In contrast, the basement topography offshore Marie Byrd Land cannot be attributed to dynamic topography, but rather to crustal thickening due to intraplate volcanism. Present-day dynamic topography models disagree with the presented revised basement topography of the South Pacific, rendering paleotopographic reconstructions with such a limited dataset still fairly uncertain.
Serge Lallemand - One of the best experts on this subject based on the ideXlab platform.
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relation between subduction megathrust earthquakes trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:[1] Giant earthquake (moment magnitude Mw ≥ 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (≥1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years.
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Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:Giant earthquake (moment magnitude M-w >= 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (>= 1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years. Citation: Heuret, A., C. P. Conrad, F. Funiciello, S. Lallemand, and L. Sandri (2012), Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain, Geophys. Res. Lett., 39, L05304, doi: 10.1029/2011GL050712.
F. Funiciello - One of the best experts on this subject based on the ideXlab platform.
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relation between subduction megathrust earthquakes trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:[1] Giant earthquake (moment magnitude Mw ≥ 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (≥1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years.
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Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain
Geophysical Research Letters, 2012Co-Authors: Arnauld Heuret, C. P. Conrad, F. Funiciello, Serge Lallemand, L. SandriAbstract:Giant earthquake (moment magnitude M-w >= 8.5) forecasts for subduction zones have been empirically related to both tectonic stresses and geometrical irregularities along the subduction interface. Both of these controls have been suggested as able to tune the ability of rupture to propagate laterally and, in turn, exert an important control on giant earthquake generation. Here we test these hypotheses, and their combined influence, by compiling a dataset of trench fill Thickness (a proxy for smoothing of subducting plate relief by Sediment input into the subduction channel) and upper plate strain (a proxy for the tectonic stresses applied to the subduction interface) for 44 segments of the global subduction network. We statistically compare relationships between upper plate strain, trench Sediment Thickness and maximal earthquake magnitude. We find that the combination of both large trench fill (>= 1 km) and neutral upper plate strain explains spatial patterns of giant earthquake occurrence to a statistically significant degree. In fact, the concert of these two factors is more highly correlated with giant earthquake occurrence than either factor on its own. Less frequent giant earthquakes of lower magnitude are also possible at subduction zones with thinner trench fill and compressive upper plate strain. Extensional upper plate strain and trench fill < 0.5 km appear to be unfavorable conditions, as giant earthquakes have not been observed in these geodynamical environments during the last 111 years. Citation: Heuret, A., C. P. Conrad, F. Funiciello, S. Lallemand, and L. Sandri (2012), Relation between subduction megathrust earthquakes, trench Sediment Thickness and upper plate strain, Geophys. Res. Lett., 39, L05304, doi: 10.1029/2011GL050712.