 |
| Titel |
Generalization of the H - κ stacking method to anisotropic media |
| VerfasserIn |
Ayoub Kaviani, Georg Rumpker |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113702
|
| Publikation (Nr.) |
 EGU/EGU2015-13921.pdf |
|
|
|
|
|
| Zusammenfassung |
| The effect of anisotropy on the estimates of crustal thickness H and average bulk
vP/vS-ratio κ can be significant in the presence of strong seismic anisotropy. Here we extend
the stacking approach of Zhu and Kanamori (2000) to include all twenty P-to-S converted
phases 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 H and κ 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 much better constraints on the estimation of H and κ
in comparison to the isotropic stacking. The anisotropic stacking can also help
to resolve ambiguities in the determination of H and κ when several maxima of
stacked receiver-function amplitudes arise in cases of complex crustal structure. |
|
|
|
|
|