The Natural Right Lateral Strike-slip Fault Laboratory: August (Yzmit) and Nowember (Dezce) 1999 Earthquakes Surface Ruptures (Marmara Region - Turkey)

The Northern strand of the North Anatolian Fault System (Marmara region) broke with the August and Nowember 1999 earthquakes. While The August surface rupture is occured about 145 km lenght. The Nowember surface rupture is happened lenght about 40 km. These are natural dextral strike-slip fault laboratory. Main fault and secondary fault geometry of which strike-slip fault systems is inspected with some experimental methods by scientist. The 1999 August and Nowember surface ruptures are demonstrated clearly some structures as a natural. The surface breaks that right-lateral active fault system and exist be like landslides, sag-ponds, CH4 gas seeps, a trace of Surface S waves happened by earthquake and liquefactions above theirs. These are change into both morphology and follow this active fault plane. Besides small pull-apart basins and push-up structures are related to right-lateral fault system, as well this stuctures are transtensional and traspressional ingredient of this fault system. The surface breaks that related to active dextral fault system that formed zone. Furthermore these are caused to transgression some locations (Golcuk - Izmit). Main fault plane is seem as en-echalon features in the studying area. Besides this fault zone is consist of P, R dextral fault and R sinistral fault. Consequently; this area is formed as dextral strike-slip fault laboratory. Furthermore this fault zone is composed of strain elipsoid to northern and southern boundary in the region. Keywords: right-lateral fault system, transtansional and transpressional ingredient, strain elipsoid.