Effects of seismic anisotropy on P-velocity tomography of the Baltic Shield

0368187 - GFÚ 2012 RIV GB eng J - Článek v odborném periodiku
Eken, T. - Plomerová, Jaroslava - Vecsey, Luděk - Babuška, Vladislav - Roberts, R. - Shomali, H. - Bodvarsson, R.
Effects of seismic anisotropy on P-velocity tomography of the Baltic Shield.
Geophysical Journal International. Roč. 188, č. 2 (2012), s. 600-612. ISSN 0956-540X. E-ISSN 1365-246X
Grant CEP: GA AV ČR IAA300120709
Výzkumný záměr: CEZ:AV0Z30120515
Klíčová slova: body waves * seismic anisotropy * seismic tomography * cratons
Kód oboru RIV: DC - Seismologie, vulkanologie a struktura Země
Impakt faktor: 2.853, rok: 2012

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.
Trvalý link: http://hdl.handle.net/11104/0202598