Offshore Multi Component Deep Seismic Investigations

The long-term experience of work WARRP with bottom ocean stations (offshore Barents, Kara, Okhotsk regions) and the subsequent processing of received materials have been acquired by Sevmorgeo. The powerful waves source (120 liters) and short stations interval (250 m between sources and about 10 km between bottom stations) provide registration and tracking of refraction/reflection waves. The advantage of OBS measurement is the possibility of multi component recording. It allows picking of not only P waves but also PS waves. The revision of the data was aimed at PS-wave processing resulted in S-velocity model building. Several segments of the regional lines were chosen after four component record analyses. The key factors were: (1) geological background (2) the possibility to trace PS waves. Preprocessing and picking have been performed in order to create PS wave travel time data base. New data base has been merged with existed P wave travel time date base. S-waves velocity models down to Moho boundary along segments selected have been constructed due to kinematic modeling in framework of SeisWide software although different approached were also investigated. Geological interpretation of the S velocity models obtained is presented.