AN: T71E-07TI: SHEAR WAVE IMAGE OF THE CRUST ALONG PORTLAND CANALEM: morozov@moho.uwyo.eduAU: S. B. SmithsonEM: smithson@moho.uwyo.eduAU: L. S. HollisterEM: linc@geo.Princeton.eduAB: We present the results of our ongoing analysis of wide- angle seismic data acquired during ACCRETE experiment in September 1994. The ACCRETE project is a collaborative geophysical and geological study of terrain accretion in the central segment of the Coast Mountains orogen, along the fjord of Portland Canal, on both sides of the border between SE Alaska and British Columbia. Consistent quality of the data allows a detailed analysis of the shear wave wavefield. In fact, shear (S) wave and converted (PS and SP) reflections carry in many cases more energy then the primary compressional (P) wave reflections. Shear wave reflections from Moho in some cases can be observed within the entire of fset range, including zero offset, which is impossible for P wave Moho reflections. Although this is partly due to the lower noise background of S wave events, this observation indicates high reflectivity of the Moho and low attenuation of shear waves. A remarkable S-wave ãbright spotä was observed on or near the Moho at about 60 km NE of the surface projection of Coast Shear zone. Applying travel time analysis techniques to the records from 32 REFTEK stations deployed along Portland Canal, we develop a S wave velocity model of the crust, and derive S- wave Moho profile. This model is compared to the corresponding P wave model obtained before. Polarization analysis of direct shear wave arrivals shows indications of splitting. Using polarization filtering and crosscorrelation techniques, we are able to measure the splitting delay times. These delay times provide valuable information for the measurement of subsurface anisotropy. SC: TDE: 7200DE: 8105DE: 8180MN: Fall Meeting 1996