The scientific study of earthquakes and the propagation of elastic waves through the Earth or other planet like bodies is referred to as seismology. It also includes the environmental effects of the earthquake such as tsunamis. The elastic waves that propagate in fluid or solid materials are known as seismic waves. Some of the different types of seismic waves studied within this field are body waves, surface waves and normal modes. Body waves travel through the interior of the materials. Surface waves travel along surfaces or interfaces between materials. Normal modes are a form of standing wave. This book provides significant information of this discipline to help develop a good understanding of seismology and related fields. It brings forth some of the most innovative concepts and elucidates the unexplored aspects of this field. Experts and students actively engaged in this field will find this book full of crucial and unexplored concepts.