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