Complex seismic anisotropic structure beneath the central Tien Shan revealed by shear wave splitting analyses

Frequency-dependent shear wave splitting and heterogeneous anisotropic structure beneath the Gulf of California region

The Gulf of California region has undergone a major evolution over the past ∼15Ma, since subduction of the now-extinct Farallon plate ceased and transform motion began, leading to the initiation of rifting and the opening of the Gulf of California ∼5Ma ago. The character of dynamic processes in the upper mantle beneath the region remains poorly understood, but constraints on seismic anisotropy ...

Seismic Hazard in Tien Shan: Basement Structure Control Over the Deformation Induced by Indo-Eurasia Collision

Characteristics of mantle fabrics beneath the south-central United States: Constraints from shear-wave splitting measurements

New shear-wave splitting measurements at permanent broadband seismic stations in the south-central United States reveal the orientation and degree of polarization of mantle fabrics, and provide constraints on models for the formation of these fabrics. For stations on the stable North American craton, correspondence between observed polarization direction of the fast wave and the trend of Proter...

Upper-mantle flow beneath French Polynesia from shear wave splitting

Fabrice R. Fontaine,1,2 Guilhem Barruol,1,3 Andréa Tommasi3 and Götz H. R. Bokelmann3 1Laboratoire Terre-Océan, Université de Polynésie française, BP 6570, 98702 Faaa, Tahiti, Polynésie française 2Research School of Earth Sciences, Australian National University, Building 61, Mills Road, Canberra, ACT 0200, Australia. E-mail: [email protected] 3Géosciences Montpellier, CNRS, Université Mo...

Complex anisotropy beneath the Peruvian flat slab from frequency- dependent, multiple-phase shear wave splitting analysis

[1] Flat or shallow subduction is a relatively widespread global occurrence, but the dynamics remain poorly understood. In particular, the interaction between flat slabs and the surrounding mantle flow has yet to be studied in detail. Here we present measurements of seismic anisotropy to investigate mantle flow beneath the Peruvian flat-slab segment, the largest present-day region of flat subdu...