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Author (up) Afsaneh Mohammadzaheri, Karin Sigloch, Kasra Hosseini, Mitchell G. Mihalynuk
Title Subducted Lithosphere Under South America From Multifrequency P Wave Tomography Type Journal
Year 2021 Publication Journal of Geophysical Research: Solid Earth Abbreviated Journal
Volume 126 Issue 6 Pages e2020JB020704
Keywords Andes intra-arc intra-oceanic subduction seismic tomography South America structure of the mantel
Abstract We analyze mantle structure under South America in the DETOX-P1 seismic tomography model, a global-scale, multifrequency inversion of teleseismic P waves. DETOX-P1 inverts the most extensive data set of broadband, waveform-based traveltime measurements to date, complemented by analyst-picked traveltimes from the ISC-EHB catalog. The mantle under South America is sampled by ∼665,000 cross-correlation traveltimes measured on 529 South American broadband stations and on 5,389 stations elsewhere. By their locations, depths, and geometries, we distinguish four high-velocity provinces under South America, interpreted as subducted lithosphere (“slabs”). The deepest (∼1,800–1,200 km depth) and shallowest (<600 km) slab provinces are observed beneath the Andean Cordillera near the continent’s northwest coast. At intermediate depths (1,200–900 km, 900–600 km), two slab provinces are observed farther east, under Brazil, Bolivia and Venezuela, with links to the Caribbean. We interpret the slabs relative to South America’s paleo-position over time, exploring the hypothesis that slabs sank essentially vertically after widening by viscous deformation in the mantle transition zone. The shallowest slab province carries the geometric imprint of the continental margin and represents ocean-beneath-continent subduction during Cenozoic times. The deepest, farthest west slab complex formed under intra-oceanic trenches during late Jurassic and Cretaceous times, far west of South America’s paleo-position adjoined to Africa. The two intermediate slab complexes record the Cretaceous transition from westward intra-oceanic subduction to eastward subduction beneath South America. This geophysical inference matches geologic records of the transition from Jura-Cretaceous, extensional “intra-arc” basins to basin inversion and onset of the modern Andean arc ∼85 Ma.
Programme 133
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2169-9356 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7991
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Author (up) Agabi, A.; Aristidi, E.; Azouit, M.; Fossat, E.; Martin, F.; Sadibekova, T.; Vernin, J.; Ziad, A.
Title First Whole Atmosphere Nighttime Seeing Measurements at Dome C, Antarctica Type Journal Article
Year 2006 Publication The Publications of the Astronomical Society of the Pacific Abbreviated Journal Publ. Astron. Soc. Pac.
Volume 118 Issue 840 Pages 344-348
Keywords Site Testing
Abstract We report site-testing results obtained in the nighttime during the polar autumn and winter at Dome C. These results were collected during the first Concordia winterover by A. Agabi. They are based on seeing and isoplanatic angle monitoring, as well as in situ balloon measurements of the refractive index structure constant profiles C2n(h). Atmosphere is divided into two regions: (1) a 36 m high surface layer responsible for 87% of the turbulence, and (2) a very stable free atmosphere above, with a median seeing of 0.36“ +/- 0.19” at an elevation of h=30 m. The median seeing measured with a differential image motion monitor placed on top of an 8.5 m high tower is 1.3“ +/- 0.8”.
Programme 908
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Corporate Author Thesis Bachelor's thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0004-6280 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 3180
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Author (up) Aghajari N., Feller G., Gerday C. & Haser R.
Title Structural basis of a alpha-amylase activation by chloride. Type Journal Article
Year 2002 Publication Protein science Abbreviated Journal Protein Sci.
Volume 11 Issue Pages 1435-1441
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Abstract
Programme 193
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Series Editor Series Title Abbreviated Series Title
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ISSN 0961-8368 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 622
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Author (up) Aghajari N., Feller G., Gerday C. & Haser R.
Title Crystallization and preliminary X-ray diffraction studies of a-amylase from the antarctic psychrophile Alteromonas haloplanctis A25. Type Journal Article
Year 1996 Publication Protein science Abbreviated Journal Protein Sci.
Volume 5 Issue Pages 2128-2129
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Abstract
Programme 165
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ISSN 0961-8368 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 631
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Author (up) Aghajari N., Feller G., Gerday C. & Haser R.
Title Structures of the psychrophilic Alteromonas halop Ch. lanctis alpha-amylase give insights into cold adaptation at molecular level. Type Journal Article
Year 1998 Publication Structure Abbreviated Journal Structure
Volume 6 Issue Pages 1503-1516
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Abstract
Programme 193
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ISSN 0969-2126 ISBN Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 1629
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Author (up) Aghajari N., Feller G., Gerday C. & Haser R.
Title Crystal structures of the psychrophilic amylases from Alteromonas haloplanctis in its native form and complexed with an inhibitor. Type Journal Article
Year 1998 Publication Protein science Abbreviated Journal Protein Sci.
Volume 7 Issue Pages 564-572
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Abstract
Programme 165
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ISSN 0961-8368 ISBN Medium
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Notes Approved yes
Call Number Serial 1700
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Author (up) Aghajari N., Van Petegem F., Villeret V., Chessa J.P., Gerday C., Haser R. & VanBeeumen J.
Title Crystal structures of a psychrophilic metalloprotease reveal new insights into catalysis by cold-adapted proteases. Type Journal Article
Year 2003 Publication Proteins-structure function and bioinformatics Abbreviated Journal Proteins
Volume 50 Issue Pages 636-647
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Programme 193
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ISSN 0887-3585 ISBN Medium
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Notes Approved yes
Call Number Serial 2377
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Author (up) Agnès Baltzer, Marine Bourriquen, Jérôme Fournier-Sowinski, Denis Mercier, S. Costa, Florian Tolle, Eric Bernard, Maria Jensen
Title Evolution of prodeltas: a print of glacier melting processes Type Peer-reviewed symposium
Year 2017 Publication Svalbard Science Conference 2017, 6-8 November 2017, Scandic Fornebu, Oslo, Norway Abbreviated Journal
Volume Issue Pages
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Abstract
Programme 1223
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Notes Approved yes
Call Number Serial 8751
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Author (up) Agnès Chounet, Martin Vallée
Title Global and Interregion Characterization of Subduction Interface Earthquakes Derived From Source Time Functions Properties Type Journal
Year 2018 Publication Journal of Geophysical Research: Solid Earth Abbreviated Journal
Volume 123 Issue 7 Pages 5831-5852
Keywords global earthquake seismology radiated energy seismic coupling source time functions stress drop subduction earthquakes
Abstract Source time functions (STFs) describe how the seismic moment rate is released with time, and carry information on integral rupture properties, such as static stress drop and radiated energy. In this study, we systematically analyze a set of 1,433 STFs extracted from the SCARDEC method (Vallée and Douet, 2016, https://doi.org/10.1016/j.pepi.2016.05.012), containing the Mw≥5.6, shallow (z≤70 km) earthquakes with dip-slip mechanism that occurred between 1992 and 2014. At the global scale, STFs properties indicate scale invariance of stress drop and scaled radiated energy with magnitude. In a second step, these source parameters are investigated in light of the tectonic context of the earthquakes: in agreement with other approaches, we observe that subduction interface earthquakes have lower stress drop and scaled radiated energy relative to all other earthquakes (e.g., crustal earthquakes). Finally, a focus on subduction interface earthquakes (approximately 800 earthquakes) is done by considering 18 regional segments of subduction zones. We find that these segments do not have the same signature in terms of macroscopic rupture properties, which means that large-scale plate convergence and mechanical properties influence rupture behavior. In a given segment, local heterogeneities of stress drop or radiated energy can be associated with local features of the subduction zone: in particular, we find that low coupled zones generate earthquakes with low stress drop and scaled radiated energy. This last feature, also observed at a larger scale, suggests a positive correlation between coupling and stress drop.
Programme 133
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Language Summary Language Original Title
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ISSN 2169-9356 ISBN 2169-9356 Medium
Area Expedition Conference
Notes Approved yes
Call Number Serial 7383
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Author (up) Agnès Lewden
Title Stratégies de thermorégulation liées aux contraintes physiologiques et environnementales chez le manchot royal (Aptenodytes patagonicus) Type Thesis
Year 2017 Publication Thèse soutenue le 20 octobre 2017, strasbourg university Abbreviated Journal
Volume 203 pp Issue Pages
Keywords
Abstract The energetic cost of foraging activities in King Penguin (Aptenodytes patagonicus) consists to reach
favourable areas, realizes depth diving to attempt fish patch and resting in high latitude cold water.
Several studies have shown that resting in cold water could be represent a more expensive cost than
realized depth diving. Indeed, this paradox is probably linked with contrasting thermoregulation
processes. During daylight, a general hypothermia occurs and is believed to reduce energy
expenditure. At sunrise occurs a re-warming to normothermia, contributing to increase heat-loss
during the night. We hypothesise an energetic conflict between thermoregulation and digestive
processes. During daylight, the organism may be unable to assimilate the end product of prey
digestion (free fatty acids) inside the peripheral subcutaneous adipose tissues (SAT), because skin
is no more blood perfused. During the night, re-warming and re-connecting to blood circulation
peripheral tissues could be inevitable to end the assimilation of FFA inside the SAT. In a first step,
we have reproduced the conditions of a resting night at sea and events of rewarming skin
temperature, using a sea water tank in which king penguins equipped with internal temperature
loggers were maintained several days. In a second step, we have tested a generalisation of our
hypothesis studying body temperature variations on penguins fast and feed. Finally, we have
measured the cost to maintain normothermia in cold water with respirometry measures and
investigated peripheral vasodilation with body temperature variations and infrared thermography.
Key words: Thermoregulation – Normothermia – Seabirds – Vasodilation – Energetic
Programme 394
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Corporate Author Thesis Ph.D. thesis
Publisher Place of Publication Editor
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Area Expedition Conference
Notes Approved yes
Call Number Serial 7344
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