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Azimuthal anisotropy in the wider Vienna basin region: a proxy for the present-day stress field and deformation

Authors :
Rafael Abreu
Edi Kissling
Thomas Plenefisch
Luděk Vecsey
Götz Bokelmann
Glenn Cougoulat
K. Kuk
H. Munzarová
Michael Korn
Jaroslava Plomerová
M. Bès De Berc
Zoltán Gráczer
K. Fischer
Domenico Giardini
T Fiket
Milena Moretti
Viktor Wesztergom
Simon Besançon
Daniele Spallarossa
M. Vallocchia
R. Voigt
S. Schippkus
A. Cavaliere
A. Nardi
Marco Massa
ETHZ-Sed Electronics Lab
Sven Schippkus
Thomas Meier
Irene Molinari
Claudia Piromallo
Wolfgang Friederich
B. Klotz
S. Funke
M. Santulin
Goetz Bokelmann
Lucia Margheriti
Zoltán Wéber
S. Ueding
Davide Piccinini
J. Kotek
Damiano Pesaresi
György Hetényi
Iva Dasović
Anne Paul
Yan Jia
Maria-Theresia Apoloner
Stefano Solarino
Silvia Pondrelli
M. Reiss
Wayne C Crawford
M. Čarman
S. Danesi
Joachim R. R. Ritter
Jean-Xavier Dessa
C. Maron
R. Daniel
I. Allegretti
C. Aubert
W. Scherer
A. Dannowski
Petr Kolínský
Claudio Chiarabba
S. Prevolnik
S. Egdorf
John Clinton
Vesna Šipka
Ezio D'Alema
Florian Fuchs
Marc Régnier
L. Métral
G. Szanyi
Simone Salimbeni
Hélène Jund
Mladen Živčić
Marijan Herak
D. Malengros
Heidrun Kopp
Frederik Tilmann
E. Szücs
Christine Thomas
J. Huber
Catherine Péquegnat
David Wolyniec
J. Chèze
Joachim Wassermann
T. Czifra
L. Cristiano
J. Loos
Christian Weidle
D. Jarić
Cécile Doubre
R. Racine
Stefan Wiemer
L. Kühne
Aladino Govoni
Sara Lovati
S. Klingen
Josip Stipčević
Kathrin Spieker
F. Wolf
Dimitri Zigone
P. Jedlička
G. Weyland
D. Petersen
Dietrich Lange
Davorka Herak
S. Heimers
Gidera Gröschl
D. Brunel
J. Pahor
T. Zieke
Martin Thorwart
Anne Deschamps
Xavier Martin
M. Capello
Georg Rümpker
D. Schulte-Kortnack
B. Heit
F. Mazzarini
B. Süle
Angelo Strollo
Institut de physique du globe de Strasbourg (IPGS)
Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Sismologie (IPGS) (IPGS-Sismologie)
Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Source :
Geophysical Journal International, Geophysical Journal International, Oxford University Press (OUP), 2020, 220 (3), pp.2056-2067. ⟨10.1093/gji/ggz565⟩
Publication Year :
2019
Publisher :
Oxford University Press (OUP), 2019.

Abstract

SUMMARYWe infer seismic azimuthal anisotropy from ambient-noise-derived Rayleigh waves in the wider Vienna Basin region. Cross-correlations of the ambient seismic field are computed for 1953 station pairs and periods from 5 to 25 s to measure the directional dependence of interstation Rayleigh-wave group velocities. We perform the analysis for each period on the whole data set, as well as in overlapping 2°-cells to regionalize the measurements, to study expected effects from isotropic structure, and isotropic–anisotropic trade-offs. To extract azimuthal anisotropy that relates to the anisotropic structure of the Earth, we analyse the group velocity residuals after isotropic inversion. The periods discussed in this study (5–20 s) are sensitive to crustal structure, and they allow us to gain insight into two distinct mechanisms that result in fast orientations. At shallow crustal depths, fast orientations in the Eastern Alps are S/N to SSW/NNE, roughly normal to the Alps. This effect is most likely due to the formation of cracks aligned with the present-day stress-field. At greater depths, fast orientations rotate towards NE, almost parallel to the major fault systems that accommodated the lateral extrusion of blocks in the Miocene. This is coherent with the alignment of crystal grains during crustal deformation occurring along the fault systems and the lateral extrusion of the central part of the Eastern Alps.

Details

Language :
English
ISSN :
0956540X and 1365246X
Database :
OpenAIRE
Journal :
Geophysical Journal International, Geophysical Journal International, Oxford University Press (OUP), 2020, 220 (3), pp.2056-2067. ⟨10.1093/gji/ggz565⟩
Accession number :
edsair.doi.dedup.....0a2846cf71a25aebed3359d7ddba05ba
Full Text :
https://doi.org/10.1093/gji/ggz565⟩