Foreshocks are often recorded in which phase?

The study of earthquakes is called ______

How many types on the basis of depth of focus are present?

The point vertically above the focus is ______

A dam is subjected to simpler system of forces during an earthquake compared to the other buildings.

The phase during which the stored elastic energy is released is ______

The type of earthquake very rare in occurrence is ______

What should be the type of foundation for concrete and masonry buildings?