Type of L-wave in which the particle is of a complex nature is ______

The shallow earthquakes occur very rare.

The type of earthquake very rare in occurrence is ______

The study of earthquakes is called ______

To avoid shearing, dam has to be placed as far as possible from ______

The phase which involves restoration to state of equilibrium is ______

Which of the following need not be avoided for construction of quake resistant buildings?

What is the maximum depth of focus observed till date?