  The problem of submarine sediment slide which generates the surface water
waves is considered. To simulate numerically the landslide motion it is used
the method which permits to take into account detailed rheological properties
of slide body constituents. The numerical simulation of landslide-induced
surface water waves is performed on the basis of nonlinear shallow water
equations. It is studied a landslide behavior for two values of maximal
friction angle. The detailed comparison of landslide dynamics and evolution of
landslide-induced surface water waves during sliding is performed. Also, the
evolution of dipolar water wave generated in the beginning of sediment sliding
is studied. It is obtained that this dipolar wave is then transformed in two
wave groups: crest and trough coming seaward and trough accompanied by crest
coming to the shoreline. The second wave group leads firstly to sea recession
from the beach and only then to large runup (tsunami wave with first negative
phase).
