Detailed information regarding the field of seismic waves has been presented in this insightful book. Seismic wave research not only enables us to assess earthquakes and tsunamis but it also acts as an indicator to determine Earth's features and composition. It has also led to the discovery of Mohorovicic discontinuity. With the development of theoretical understanding of physics behind seismic waves, numerical and physical modelings have remarkably advanced. It has also contributed towards some advanced applications like utilization of seismic stimulation to enhance the productivity of oil wells and utilization of artificially-induced shocks to examine subsurface of Earth. This book illustrates developments in seismic wave analysis from a theoretical perspective. It also discusses numerical simulations, research applications, data acquisition and interpretation. It includes contributions of scientists and researchers from all over the world.