Seismic anisotropy under central Alaska from SKS splitting observations

Short Note Seismic Anisotropy from SKS Splitting beneath Northeastern Tibet

The northeastern boundary of the Tibetan high plateau is marked by a 2 km topographic drop and a coincident rapid change in crustal thickness. Surface tectonics are dominated by the Kunlun strike-slip fault system and adjacent Kunlun concealed thrust. The main objective of the current study is to map lateral variations of seismic anisotropy parameters in this region along the linear INDEPTH IV ...

Seismic anisotropy and slab dynamics from SKS splitting recorded in Colombia

The Nazca, Caribbean, and South America plates meet in northwestern South America where the northern end of the Andean volcanic arc and Wadati-Benioff zone seismicity indicate ongoing subduction. However, the termination of Quaternary volcanism at ~5.5°N and eastward offset in seismicity underneath Colombia suggest the presence of complex slab geometry. To help link geometry to dynamics, we ana...

Complex anisotropy in D′′ beneath the eastern Pacific from SKS–SKKS splitting discrepancies

Anisotropy from SKS splitting across the Pacific-North America plate boundary offshore southern California

Joseph Ramsay,1 Monica D. Kohler,2 Paul M. Davis,1 Xinguo Wang,3,4 William Holt4 and Dayanthie S. Weeraratne5 1Department of Earth and Space Sciences, University of California Los Angeles, Los Angeles, CA 90095-1596, USA 2Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125, USA. E-mail: [email protected] 3Key Laboratory of Continental Collisio...

On the interpretation of SKS splitting measurements in the presence of several layers of anisotropy

S U M M A R Y Concerns over the validity of expressions derived by Montagner et al. that link SKS splitting measurements to the variation with depth of anisotropic parameters in the upper mantle have been recently expressed, pointing out that the long period approximations applied by these authors may not be valid for the frequency range commonly used in SKS studies, and in particular, that the...