In 1999, two earthquakes occurred in the Istanbul-Marmara region of Turkey and the Athens-Corinth region of Greece, and an increased risk of further events caused great concern among the earth science community. This book presents and discusses the latest results from studies of the Izmit-Düzce and Athens earthquakes and assesses the data that are available and relevant to the geology, seismology, tectonics, geodesy and other fields related to earthquake studies and to evaluate earthquake hazard potential.