Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 6 6 2006 10.5194/nhess-6-999-2006 http://www.nat-hazards-earth-syst-sci.net/6/999/2006/ http://www.nat-hazards-earth-syst-sci.net/6/999/2006/nhess-6-999-2006.html http://www.nat-hazards-earth-syst-sci.net/6/999/2006/nhess-6-999-2006.pdf 999 1006 2006-11-30 Marmara Island earthquakes, of 1265 and 1935; Turkey Y. Altınok yaltinok@istanbul.edu.tr B. Alpar Istanbul University, Engineering Faculty, Department of Geophysics, 34850 Avcilar, Istanbul, Turkey Istanbul University, Institute of Marine Sciences and Management, 34116 Vefa, Istanbul, Turkey The long-term seismicity of the Marmara Sea region in northwestern Turkey is relatively well-recorded. Some large and some of the smaller events are clearly associated with fault zones known to be seismically active, which have distinct morphological expressions and have generated damaging earthquakes before and later. 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