Seismic anisotropy distribution beneath southern Sakhalin |
| |
Authors: | M N Luneva |
| |
Institution: | 1.Kosygin Institute of Tectonics and Geophysics, Far East Branch,Russian Academy of Sciences,Khabarovsk,Russia |
| |
Abstract: | Shear wave splitting parameters from local deep-focus and crustal earthquakes beneath southern Sakhalin and northern Hokkaido
have been measured. The study of the split shear wave amplitude, polarization, and splitting parameter distribution revealed
their correlation with the geometry of the subsiding Pacific Plate and horizontal heterogeneity of the rheological properties
and viscosity of the medium. Comparison of the observed data with those modeled in anisotropic media allows the mantle flow
to be oriented NNW beneath southern Sakhalin and northern Hokkaido. Based on the split shear wave time delays, the degree
of mantle anisotropy is estimated to be around 1–2% beneath southern Sakhalin and 1.5–2.5% beneath northern Hokkaido. A relatively
high anisotropy (2–15%) from local crustal earthquakes is found beneath the Central Sakhalin Fault. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|