Crisis are serious, comprehensive and unexpected events. Thus it’s necessary to response immediately. Today, because of socio-economic problems, types of crisis are increasing and some crisis impact on all over the world (diseases, climate chance etc.) Crisis are more dangerous than before. Consequently, today crisis management is quite important for all organizations. In the first part of this study, crisis and crisis management concepts are examined briefly and then crisis communication studied with its some different dimensions. In the last part of the study crisis management process of 1999-Marmara Earthquake examined. Communication and coordination problem of emergency period studied according to four dimensions, of crisis communication. Particularly crisis communication as a networks dimension analyzed. In emergency period of the Marmara Earthquake a lot of coordination and communication problems appeared. Most of the problems are related with international nongovernmental organizations. To solve these coordination problems effective communication mechanisms and preparedness are necessary.