Record details

Title
    Effects of seismic anisotropy on P-velocity tomography of the Baltic Shield
Author
    Babuška, Vladislav
    Bodvarsson, R.
    Eken, T.
    Plomerová, Jaroslava
    Roberts, R.
    Shomali, H.
    Vecsey, Luděk
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 188, č. 2
Pages
    s. 600-612
Year
    2012
Notes
    Projekt: IAA300120709, GA AV ČR3cav_un_auth*0228940
    Rozsah: 13 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    body waves
    cratons
    seismic anisotropy
    seismic tomography
Keyword
    Anisotropy
    Baltic
    Effects
    P-velocity
    Seismic
    Shield
    Tomography
Abstract (in english)
   We investigate possible effects of neglecting seismic anisotropy on standard isotropic P velocity tomographic images of the upper mantle beneath the Baltic shield. Isotropic inversions of teleseismic P- and S-wave traveltimes exhibit alternating high- and low-velocity heterogeneities down to depths of over 400 km. Differences in tomographic inversions of SV- and SH-wave traveltimes are distinct down to depths of about 200 km and are associated with anisotropy of the lithospheric mantle. Anisotropic structures of the upper mantle affect both the P and S traveltimes, shear-wave splitting as well as the P polarization directions. Joint inversion for isotropic and anisotropic velocity perturbations is not feasible due to the limited 3-D ray coverage of available data.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013