Discussion of the disaster management in our country begins after 1992 Erzincan and 1995 Dinar Earthquakes. These earthquakes, which are described “city earthquakes” because of their epicentre, fault characteristics and effects, required radical changing about disaster and disaster management. There is an order about generation of the earthquakes in the world and also our country. Turkey and its surrounding area have an order which is explained by plate tectonics and proved by lots of investigations. The Marmara Region contains nearly 45% of industry of the country. That high-grade industry is directly related to sub-industry on Anatolia. Considering 50 % of total taxes of country are obtaining by this region, the risk of possible Marmara Earthquakes is crucial from the point of national economy. The material damage is expected between 30-50 billion dollars by experts. Until 17 August 1999 Gölcük Earthquake, the measurement-based fault investigations about The Marmara Sea are made fairly few. After 17 August 1999 Gölcük and 12 November Düzce Earthquakes, important data about tectonic structure of the Marmara Sea are acquired by the investigations, especially seismic studies. The North Anatolian Fault Zone (NAFZ) continues down the road towards west on the Marmara Sea by several earthquakes, magnitude is at least one of them more than 7. The precautions about the NAFZ’s these processes which can be called “Marmara Phase” are inadequate in generally.

Keywords: Earthquakes, plate tectonics, city earthquakes, marmara phase, disaster