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Walpole J, Wookey J, Masters G, Kendall J M, |
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Title |
A uniformly processed data set of SKS shear wave splitting measurements: A global investigation of upper mantle anisotropy beneath seismic stations |
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2014 |
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Geochemistry, Geophysics, Geosystems |
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15 |
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5 |
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1991-2010 |
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Keywords |
anisotropy, seismology, mantle, shear wave splitting, 7203 Body waves, 7208 Mantle, 8120 Dynamics of lithosphere and mantle: general, 1209 Tectonic deformation, 0520 Data analysis: algorithms and implementation, |
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Anisotropy in the Earth's upper mantle is a signature of past and present deformation. Here we present a new data set of 50,000 uniformly processed SKS shear wave splitting measurements that probe upper mantle anisotropy beneath seismic stations in the frequency band 0.020.1 Hz. The data set consists of measurements obtained at 2000 seismic stations from 2000 events. We identify several stations characterized by an apparent absence of shear wave splitting (so-called null stations). Station-averaged measurements are obtained by stacking shear wave splitting error surfaces. The stacked data set shows excellent agreement with a compilation of previous SKS measurements. The average amount of splitting beneath seismic stations (after error surface stacking) is 0.8 s, slightly lower than that found previously by vectorial averaging of non-null measurement splitting parameters. The data set disagrees, however, with an azimuthally anisotropic surface wave tomography model (DKP2005), suggesting that caution should be exercised when using such models for geodynamic interpretation, especially in continental regions. Studying our data set in detail, we find evidence that flow in the asthenosphere exerts partial control over SKS splitting in orogenic regions globally. In the active orogenic environment of the western USA, where we have the densest coverage, our data suggest that shallow asthenospheric flow is guided by a wall of thick lithosphere to the east. |
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1525-2027 |
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6276 |
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Emeline CHESNEAU |
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Variabilité des traits biochimiques de trois espèces végétales des îles subantarctiques de Kerguelen et implications adaptatives |
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Master |
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2014 |
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Master 2 "Ecologie fonctionnelle évolutive et comportementale", University Rennes 1, |
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1116 |
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6275 |
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Bost Charles-André, Delord Karine, Barbraud Christophe, Cotté Cédric, Péron Clara, Weimerskirch Henri |
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The King Penguin: Life History, current status and priority conservation actions |
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2014 |
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In: Penguins Book. (Eds P. dee Boersma & P. G. Borboroglu), University of Washinton Press, Washington. In press |
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109 |
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6274 |
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Smith, T.; Nakamura-Messenger, K.; Messenger, S.; Keller, L. P.; Khodja, H.; Raepsaet, C.; Wirick, S.; Flynn, G. J.; Taylor, S.; Engrand, C.; Duprat, J.; Herzog, G. F. |
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Title |
C/N and Other Elemental Ratios of Chondritic Porous IDPs and a Fluffy Concordia Micrometeorite |
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Conference - International - Communication |
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2014 |
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76th Annual Meeting of the Meteoritical Society, held July 29-August 7, 2013 in Edmonton, Canada. Published in Meteoritics and Planetary Science Supplement, id.5242We report C/N ratios, and other properties of two chondritic porous IDPs and a Concordia fluffy micrometeorite. |
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1120 |
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6273 |
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Quirico, E.; Bonnet, J.-Y.; Buch, A.; Thissen, R.; Szopa, C.; Carrasco, N.; Cernogora, G.; Fray, N.; Cottin, H.; Le Roy, L.; Montagnac, G.; Dartois, E.; Brunetto, R.; Engrand, C.; Duprat, J. |
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Title |
New Analogs of Cometary Nitrogen-Rich Refractory Organics and Comparison with UltraCarbonaceous MicroMeteorites |
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Conference - International - Communication |
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2014 |
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77th Annual Meeting of the Meteoritical Society, held September 7-12, 2014 in Casablanca, Morocco. LPI Contribution No. 1800, id.5122We produced fairly relevant analogs of N-rich refractory organics of UCAMMs, through thermal degradation of tholin and HCN polymer. This suggests that a formation by thermal processes in the solar nebula is plausible. |
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1120 |
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6272 |
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Gonzalez-Wevar CA, Morley S, Chown S, Coria N, Saucède T, Poulin E. |
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Extinction and recolonization of maritime Antarctica in the limpet Nacella concinna (Strebel, 1908) during the last glacial cycle: toward a model of Quaternary biogeography in shallow Antarctic invertebrates. 33rd SCAR Open Science Conference, Auckland, New Zealand. |
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2014 |
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1044 |
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6270 |
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Poulin E |
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Molecular insight into historical and recent biogeographical pattern and processes of marine benthic invertebrates in the Southern Ocean. Molecular and genetic advances to understanding evolution and biodiversity in the polar regions. The legacy of EBA, 02-03 October 2014, Naples, Italy |
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2014 |
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1044 |
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6267 |
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Féral J-P, Améziane N, Chenuil A, David B, De Ridder C, Marschal C, Poulin E & Saucède T. |
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PROTEKER : Mise en place d’un observatoire sous-marin côtier à Kerguelen. 10èmes journées scientifiques du CNFRA, Rennes. |
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2014 |
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1044 |
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6266 |
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Author |
Gilg, O. |
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Greenland |
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2014 |
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Tundra Conservation Network (10-12 February 2014). The Peregrine Fund, World Center for Birds of Prey, Boise, USA |
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1036 |
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6265 |
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Schmidt, N. M., J. Humaidan, S. H. Pedersen, O. Gilg, and B. Sittler |
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Collapsing lemming cycles in Greenland – demographic consequences for lemming predators and its linkages to snow |
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Conference - International - Communication |
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2014 |
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Arctic Biodiversity Congress, Trondheim, Norway, 2-4 December |
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1036 |
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6264 |
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