Generalization of the H‐κ stacking method to anisotropic media. Issue 7 (21st July 2015)

• Record Type: Journal Article
• Authors: Kaviani, Ayoub; Rümpker, Georg
• Is Part Of: Journal of geophysical research. Volume 120:Issue 7(2015:Jul.)
• Page Start: 5135
• Page End: 5153
• Publication Date: 2015-07-21
• Subjects: Geomagnetism -- Periodicals; Geochemistry -- Periodicals; Geophysics -- Periodicals; Earth sciences -- Periodicals; 551.1
• DOI: 10.1002/2014JB011858
• Languages: English
• ISSNs: 2169-9313

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>We investigate the effect of anisotropy on estimates of crustal thickness <italic>H</italic> and average bulk <italic>V<sub>P</sub>/V<sub>S</sub></italic>‐ratio <italic>κ</italic>. Here we extend the stacking approach of Zhu and Kanamori (2000) to include all 20 <italic>P</italic>‐to‐<italic>S</italic> converted waves and their crustal reverberations that are generated in the anisotropic case—instead of only five phases in the isotropic case. The ray‐based algorithm of Frederiksen and Bostock (2000) is used to calculate the amplitude and arrival time of each phase. Synthetic tests are performed to investigate the feasibility and robustness of the stacking approach. For simplicity, we assume hexagonal symmetry and a horizontal symmetry axis, but more general anisotropy may be considered. The tests reveal that the estimates of <italic>H</italic> and <italic>κ</italic> can be significantly affected by the presence of crustal anisotropy. We verify the feasibility of the stacking approach for real data by applying the method to examples from three different tectonic regions. The results show that the anisotropic stacking scheme presented here can provide a much better constraint on the estimation of <italic>H</italic> and <italic>κ</italic> than is achieved using isotropic stacking. Anisotropic stacking can also help resolve the ambiguity in determination of <italic>H</italic> and <italic>κ</italic> that arises when several maxima from stacking amplitudes of receiver functions occur in the case of complex crustal structure.</p> </abstract>