Article (Scientific journals)
3-D density imaging with muon flux measurements from underground galleries
Lesparre, Nolwenn; Cabrera, J.; Marteau, J.
2017In Geophysical Journal International, 208 (3), p. 1579-1591
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Keywords :
Fractures and faults; High strain deformation zones; Inverse theory; Tomography; Aquifers; Density variations; Experimental platform; Measured muon flux; Non linear inversion; Subsurface density; Charged particles; Aveyron; France; Midi-Pyrenees; Tournemire
Abstract :
[en] Atmospheric muon flux measurements provide information on subsurface density distribution. In this study, muon flux was measured underground, in the Tournemire experimental platform (France). The objective was to image the medium between the galleries and the surface and evaluate the feasibility to detect the presence of discontinuities, for example, produced by secondary subvertical faults or by karstic networks. Measurements were performed from three different siteswith a partial overlap of muon trajectories, offering the possibility to seek density variations at different depths. The conversion of the measured muon flux to average density values showed global variations further analysed through a 3-D nonlinear inversion procedure. Main results are the presence of a very low density region at the level of the upper aquifer, compatible with the presence of a karstic network hosting local cavities, and the absence of secondary faults.We discuss the validity of the present results and propose different strategies to improve the accuracy of such measurements and analysis. © The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lesparre, Nolwenn ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Cabrera, J.;  IRSN, B.P. 17, Fontenay-aux-Roses Cedex, France
Marteau, J.;  IPNL (UMR CNRS-IN2P3 5822), Université Lyon 1, Lyon, France
Language :
English
Title :
3-D density imaging with muon flux measurements from underground galleries
Publication date :
2017
Journal title :
Geophysical Journal International
ISSN :
0956-540X
Publisher :
Geological Society by Blackwell Scientific, United Kingdom
Volume :
208
Issue :
3
Pages :
1579-1591
Peer reviewed :
Peer Reviewed verified by ORBi
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since 09 June 2020

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