Earthquakes and tsunamis are two major natural disasters, causing enormous life and material losses over the entire world, especially in the developing countries that are not well prepared. Since earthquakes and tsunamis are natural phenomena that cannot be prevented, a series of measures need to be taken to minimize the losses. Disaster mitigation covers a wide variety of activities involving numerous disciplines. Civil engineering makes probably the most effective contribution to the mitigation of life and material losses in earthquakes and tsunamis. This volume contains 11 major contributions of distinguished experts from various areas of civil engineering, and aims at informing the civil engineering community about the recent progress in disaster mitigation concerning earthquakes and tsunamis. It is designed to address the standard practicing civil engineer with the aim of carrying the scientific research results to the engineering practice in simple engineering language.