Daniel Sauter

Centre National de la Recherche Scientifique

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Giänreto Manatschal

Université de Strasbourg

Mathilde Cannat

Centre National de la Recherche Scientifique

Marc Munschy

Université de Strasbourg

Véronique Mendel

Université de Strasbourg

Julia Autin

Université de Strasbourg

Julie Tugend

CY Cergy Paris Université

Sylvie Leroy

Centre National de la Recherche Scientifique

Nick Kusznir

University of Liverpool

Morgane Gillard

Institut des Sciences de la Terre de Paris

A. Bronner

Ifremer

Cooperative Institutions

Centre National de la Recherche Scientifique

137

Institut de physique du globe de Paris

Université de Strasbourg

Université Paris Cité

Sorbonne Université

Sorbonne Paris Cité

Institut des Sciences de la Terre

Institut de Recherche pour le Développement

Bureau de Recherches Géologiques et Minières

Institut de Physique

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HOW TO OVERCOME INSTITUTIONAL OBSTACLES

Daniel Sauter

This paper considers institutional barriers to the adoption of pedestrian-friendly policy. Transport policy and discussions on mobility often refer only to motorised transport, and statistics generated then guide decision-making. Statistics according to distance underestimate the importance of walking. Homes and destinations are increasingly spread out, making travel on foot difficult. Accident statistics concentrate on motor vehicle accidents and fail to take into account single pedestrian accidents involving tripping or slipping. Public perception of mobility overestimates car use, and walking has a poor image. Transport policy focuses on long-distance travel and most financial investment goes into roads, airports and high speed trains. External costs of motorised transport are carried by pedestrians: but pedestrian interests are neglected in government administration. The author recommends more consideration of pedestrians in policy and more transparency of negative impacts. For the covering abstract see ITRD E118896.

Investment

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Relationship of the Central Indian Ridge segmentation with the evolution of the Rodrigues triple junction for the past 8 Myr.

HAL (Le Centre pour la Communication Scientifique Directe) (2000)

Véronique Mendel Daniel Sauter Philippe Patriat Marc Munschy

Triple junction

myr

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POLICY MAKING AND IMPLEMENTATION IN SWITZERLAND

L Bonanomi Daniel Sauter

This paper reviews the current situation in Switzerland in policy to encourage pedestrian mobility. It describes the levels of government - federal, cantonal and municipal - with their responsibilities, and describes the use of popular initiative and optional referendum in policy making. Goals and current policies in transport, environment and land planning are outlined, including sustainability, improving infrastructure, promoting walking and cycling at the national level, and investing in public transport; laws on environment protection and land planning encourage consideration of the environment in transport issues. There is only limited funding for non-car initiatives although plenty of revenue is generated for motorised transport. Support at administrative levels for pedestrian issues comes from committed individuals or organisations, and research projects tend to be related to motor traffic; although there are traffic safety organisations, pedestrian and bicycle organisations and a car-sharing company. Policy tends to focus on long-distance travel rather than local mobility, and policy improvements to counteract this are suggested. For the covering abstract see ITRD E118896.

Referendum

Sustainable transport

Transportation planning

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Tectonomagmatic evolution of the final stages of rifting along the deep conjugate Australian-Antarctic magma-poor rifted margins: Constraints from seismic observations

Tectonics (2015)

Morgane Gillard Julia Autin Giänreto Manatschal Daniel Sauter Marc Munschy

The processes related to hyperextension, exhumed mantle domains, lithospheric breakup, and formation of first unequivocal oceanic crust at magma-poor rifted margins are yet poorly understood. In this paper, we try to bring new constraints and new ideas about these latest deformation stages by studying the most distal Australian-Antarctic rifted margins. We propose a new interpretation, linking the sedimentary architectures to the nature and type of basement units, including hyperextended crust, exhumed mantle, embryonic, and steady state oceanic crusts. One major implication of our study is that terms like prerift, synrift, and postrift cannot be used in such polyphase settings, which also invalidates the concept of breakup unconformity. Integration and correlation of all available data, particular seismic and potential field data, allows us to propose a new model to explain the evolution of magma-poor distal rifted margins involving multiple and complex detachment systems. We propose that lithospheric breakup occurs after a phase of proto-oceanic crust formation, associated with a substantial magma supply. First steady state oceanic crust may therefore not have been emplaced before ~53.3 Ma corresponding to magnetic anomaly C24. Observations of magma amount and its distribution along the margins highlight a close magma-fault relationship during the development of these margins.

Detachment fault

10.1002/2015tc003850

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Citations (104)

Gillard 2015 Tectonics

Morgane Gillard Julia Autin Giänreto Manatschal Daniel Sauter Marc Munschy

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Reply to comment by B. Tucholke and J.C. Sibuet on "Magmatic breakup as an explanation for magnetic anomalies at magma-poor rifted margins"

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

A. Bronner Daniel Sauter Giänreto Manatschal Gwenn Péron‐Pinvidic Marc Munschy

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Volcanism and tectonics unveiled in the Comoros Archipelago between Africa and Madagascar

Comptes Rendus Géoscience (2022)

Isabelle Thinon Anne Lemoine Sylvie Leroy Fabien Paquet Carole Berthod

Geophysical and geological data from the North Mozambique Channel acquired during the 2020–2021 SISMAORE oceanographic cruise reveal a corridor of recent volcanic and tectonic features 200 km wide and 600 km long within and north of Comoros Archipelago. Here we identify and describe two major submarine tectono-volcanic fields: the N’Droundé province oriented N160°E north of Grande-Comore Island, and the Mwezi province oriented N130°E north of Anjouan and Mayotte Islands. The presence of popping basaltic rocks sampled in the Mwezi province suggests post-Pleistocene volcanic activity. The geometry and distribution of recent structures observed on the seafloor are consistent with a current regional dextral transtensional context. Their orientations change progressively from west to east (∼N160°E, ∼N130°E, ∼EW). The volcanism in the western part appears to be influenced by the pre-existing structural fabric of the Mesozoic crust. The 200 km-wide and 600 km-long tectono-volcanic corridor underlines the incipient Somalia–Lwandle dextral lithospheric plate boundary between the East-African Rift System and Madagascar. Supplementary Materials: Supplementary material for this article is supplied as a separate file: crgeos-159-suppl.pdf Des données géophysiques et géologiques ont été acquises lors de la campagne océanographique SISMAORE (2020–2021). Deux grands champs tectono-volcaniques sous-marins ont été découverts tout le long et principalement au nord de l’archipel des Comores : la province N’Droundé orientée N160°E au nord de Grande-Comore, et la province Mwezi orientée N130°E au nord d’Anjouan-Mayotte où des roches basaltiques de type popping-rocks suggèrent une activité volcanique possiblement actuelle à pléistocène. La géométrie et la distribution des structures récentes sont cohérentes avec un contexte régional actuel transtensif dextre. Leurs orientations évoluent d’Ouest en Est (∼N160°E, ∼N130°E, ∼EW), suggérant pour la partie occidentale, une mise en place du volcanisme influencée par la structuration crustale préexistante. Le corridor tectono-volcanique de 200 km de large et de 600 km de long dessine une limite de plaque lithosphérique Somalie-Lwandle immature en décrochante dextre entre le système du rift est-africain et Madagascar. Compléments : Des compléments sont fournis pour cet article dans le fichier séparé : crgeos-159-suppl.pdf

Archipelago

Basement

10.5802/crgeos.159

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Citations (18)

Volcanic/tectonic characteristics of first and second order segments and ridge discontinuities under the hot-spot influence TOBI imagery from the Central Indian Ridge (CIR) adjacent to the Rodriguez system

AGU Fall Meeting Abstracts (2001)

Lindsay M. Parson Bramley J. Murton Daniel Sauter D. Curewitz Kyoko Okino

Classification of discontinuities

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