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TRANSCALE SIGNED

Reconciling Scales in Global Seimology

Total Cost €

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EC-Contrib. €

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Partnership

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 TRANSCALE project word cloud

Explore the words cloud of the TRANSCALE project. It provides you a very rough idea of what is the project "TRANSCALE" about.

chemical    whereas    theoretical    first    asthenosphere    anisotropic    anisotropy    seismograms    procedure    period    algorithmic    depict    reflected    geophysical    jointly    localizing    computational    tectonics    understand    sharp    stratification    sampling    global    wave    splitting    history    sensitivity    boundary    interpreted    models    despite    upper    structure    lithosphere    for    observations    mantle    north    joint    model    bayesian    patterns    interpretation    smooth    flow    multiscale    modes    embraced    generation    discontinuities    see    frequency    single    evolution    surface    continental    usually    normal    questions    successes    inverting    entirely    nature    deformation    data    scales    thermo    plate    images    separately    converted    observables    body    waves    bands    seismologists    earth    uttermost    answer    3d    constructed    consists    america    scattered    depicting    sks    tomographic    seismic    types    amount   

Project "TRANSCALE" data sheet

The following table provides information about the project.

Coordinator
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS 

Organization address
address: RUE MICHEL ANGE 3
city: PARIS
postcode: 75794
website: www.cnrs.fr

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 1˙498˙750 €
 EC max contribution 1˙498˙750 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2016-STG
 Funding Scheme ERC-STG
 Starting year 2017
 Duration (year-month-day) from 2017-04-01   to  2022-03-31

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS FR (PARIS) coordinator 1˙498˙750.00

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 Project objective

For more than 30 years, seismologists have used seismic waves to produce 3D images of the structure of the Earth. Despite many successes, a number of key questions still remain, which are of the uttermost importance to understand plate tectonics. What is the nature of the Lithosphere-Asthenosphere Boundary? What is the structure and history of the continental lithosphere?

The problem is that different seismic observables sample the Earth at different scales; they have different sensitivity to structure, and are usually interpreted separately. Images obtained from short period converted and reflected body waves see sharp discontinuities, and are interpreted in terms of thermo-chemical stratification, whereas seismic models constructed from long period seismograms depict a smooth and anisotropic upper mantle, and are usually interpreted in terms of mantle flow. However, sharp discontinuities may also produce effective anisotropy at large scales, and only a joint interpretation of different frequency bands can allow to fully localizing the patterns of deformation in the mantle.

The proposed work consists in developing and applying an entirely new approach to geophysical data interpretation, where different data types sampling the Earth at different scales are jointly embraced into a single Bayesian procedure. This proposal focuses on theoretical, algorithmic and computational advances needed for a new generation of tomographic models. We will use the large amount of data available in North-America (surface wave measurements, scattered body waves, SKS splitting measurements) to produce a multiscale model under North-America, depicting both discontinuities and anisotropy. This will allow us to answer some crucial questions about the structure and evolution of Earth. We will also produce a first fully Bayesian global Earth model by jointly inverting normal modes, surface and body wave observations.

 Publications

year authors and title journal last update
List of publications.
2017 C Alder, T Bodin, Y Ricard, Y Capdeville, E Debayle, J P Montagner
Quantifying seismic anisotropy induced by small-scale chemical heterogeneities
published pages: 1585-1600, ISSN: 0956-540X, DOI: 10.1093/gji/ggx389
Geophysical Journal International 211/3 2019-02-27
2018 Philip W Livermore, Alexandre Fournier, Yves Gallet, Thomas Bodin
Transdimensional inference of archeomagnetic intensity change
published pages: 2008-2034, ISSN: 0956-540X, DOI: 10.1093/gji/ggy383
Geophysical Journal International 215/3 2019-02-27
2019 Rhys Hawkins, Thomas Bodin, Malcolm Sambridge, Gaël Choblet, Laurent Husson
Trans-Dimensional Surface Reconstruction With Different Classes of Parameterization
published pages: , ISSN: 1525-2027, DOI: 10.1029/2018gc008022
Geochemistry, Geophysics, Geosystems 2019-02-27
2018 Nicola Piana Agostinetti, Thomas Bodin
Flexible Coupling in Joint Inversions: A Bayesian Structure Decoupling Algorithm
published pages: 8798-8826, ISSN: 2169-9313, DOI: 10.1029/2018jb016079
Journal of Geophysical Research: Solid Earth 123/10 2019-02-27
2018 N Hedjazian, T Bodin, L Métivier
An optimal transport approach to linearized inversion of receiver functions
published pages: , ISSN: 0956-540X, DOI: 10.1093/gji/ggy419
Geophysical Journal International 2019-02-27

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