The North Aegean Sea is one of the most seismically active and deforming region between the Eurasia and Anatolia tectonic plates. On 8th January 2013 at 14:16 UTC (16:16 local time) a moderate earthquake (Mw= 5.7) occurred between the south of Gökçeada and southwest of Bozcaada Islands. The earthquake was felt at a wide area. Especially felt in the NE Greece south of Lemnos Island and NW Turkey surrounding areas, such as Çanakkale, Marmara Region and Northern Aegean coast as well as to Athens. The area is defined as the continuation of the branch of North Anatolian Fault (NAF) inside the Aegean Sea. Fault plane solution determined by this study shows that the earthquake occurred on NE-SW oriented strike slip fault segment. The aftershocks distribution also supported the rupture of the NE-SW oriented fault. Approximately 17 months later, another big earthquake occurred in the same area. On 24th May 2014, at 09:25 UTC (12:25 local time), a powerful Ml=6.7 (Mw=6.8) earthquake hit Greece and Turkey, 87 km west of Çanakkale, and totally 350 people injured in Greece and Turkey. This earthquake has been strongly felt in Greece, Turkey, Bulgaria, Romania. The main-shock occurred on a fault with a NE-SW strike, where the largest portion of the energy was released towards these directions. Therefore the earthquake was felt strongly in Çanakkale, Istanbul and Marmara region. In this study we calculated CMT solutions for main-shock and important aftershocks (M>4.0). CMT analyses were done for 50 important earthquakes. Moment tensor solutions show generally strike-slip faulting. The fault which caused earthquake, is thought to be a branch of North Anatolian Fault Zone in the North Aegean Sea. Generally, the location of the earthquakes and orientation of the NE-SW nodal planes are consistent with rightlateral faulting within the North Aegean Trough (NAT). The Aegean Sea is characterized by dextral strike-slip faulting along NE-SW striking faults, along fault zones formed parallel to the North Aegean Trough (NAT). Strike slip faulting is changing to oblique, with significant component of extension, as one goes from the Aegean to the coastal area of NW and Western Turkey. The sources region of the North Aegean earthquakes is influenced by both the Aegean extensional regime and the strike-slip regime in the western part of the North Anatolin Fault Zone. Strike-slip faulting is changing to oblique, with significant component of extension, as one goes from the Aegean to the coastal area of Western Turkey. This study was supported by Bogazici University Research Projects Commission under SRP/BAP project No. 6040 and MarDIM SATREPS project.