2:15 PM - 2:30 PM
[SCG61-27] Shear wave splitting east off NE Japan based on the S-net data
Keywords:Shear wave splitting, S-net, forearc
The results show that the shear wave splitting tends to have trench parallel fast polarization direction for the region east off Chiba to Hokkaido which is the same with the observations in the land area of the forearc. Since we used earthquakes on the plate boundary, the anisotropy must be located in mantle wedge or forearc crust. The interpretation of the polarization includes the flow-normal fast direction of B-type olivine fabric in the forearc mantle-wedge and cracks aligned in the trench parallel direction due to the present forearc stress-field or fossil structures developed during the formation of the forearc.
Acknowledgements: We used S-net data which is deployed and maintained by NIED.