Complex component analysis of shear-wave splitting: case studies

Wave-equation shear wave splitting tomography

G JI S ei sm ol og y Wave-equation shear wave splitting tomography Maureen D. Long,1,∗ Maarten V. de Hoop2 and Robert D. van der Hilst1 1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA. E-mail: [email protected] 2Center for Computational and Applied Mathematics, Purdue University, 150 N. University...

Automation of Shear-Wave Splitting Measurements using Cluster Analysis

The propagation of two orthogonally polarized shear waves, or shearwave splitting, is arguably the most robust indication of seismic anisotropy in the Earth. This splitting can be parameterized in terms of the polarization of the fast shear-wave and the lag time between fast and slow components dt. These two parameters provide constraints on the mechanism causing the anisotropy. All methods of ...

eiSPLIT: an eigenvalue-method for Shear-Wave Splitting Analysis

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...

Making Reliable Shear-Wave Splitting Measurements

Shear-wave splitting (SWS) analysis using SKS, SKKS, and PKS (hereafter collectively called XKS) phases is one of the most commonly used techniques in structural seismology. In spite of the apparent simplicity in performing SWS measurements, large discrepancies in published SWS parameters (fast direction and splitting time) suggest that a significant portion of splitting parameters has been inc...