Wide-area distribution of S-wave anisotropy estimated by airgun surveys around seafloor-cabled seismometers in the Nankai Trough, Japan

We obtained wide area distribution of S-wave anisotropy below seafloor in the Nankai Trouhg subduction zone, Japan by using anisotropy semblance method applied to multi-component and azimuth seismic data observed by seafloor cabled observatories. S-wave anisotropy can be a proxy of stress state, which should be important parameter for elucidating mega-thrust earthquake preparation and generation process. We finally obtained wide area distribution of depth-dependent S-wave anisotropy in the Nankai Trough subduction zone. We expected that this method can be a simple alternative approach to obtain stress state in the seismogenic subduction zone. Presentation Date: Tuesday, October 18, 2016 Start Time: 8:50:00 AM Location: 166 Presentation Type: ORAL