In this book are examined nonlinear effects, manifested in the course of natural disasters, negative consequences as well as the way they can be solved. Special attention is given to the most dangerous and deadly disasters (earthquakes and tsunamis), which in recent years, causing more death and destruction. In this book are considered other natural hazards such as volcanoes, forest fires, floods, storms and more. The study of natural hazards, their modeling, development of methodologies for integrated risk assessment and management and its mapping are among the main topics in the book.