The western part of NAF system enters the Sea of Marmara in the Gulf of Izmit and then splits into two distinct branches that define, tectonically, northern and southern boundaries of the Marmara region. It plays an important geodynamic role between Anatolian and Eurasia plates by moving with an average slip rate at 20–30 mm/year (McKenzie 1972 McClusky et al. The North Anatolian fault (NAF) system across the Turkey is a right lateral strike-slip fault about 1500 km from Karlıova triple junction to the Sea of Marmara. Our preferred solutions showed that the fault mechanisms for the three events are normal faults and coincide with the seismotectonic structure of the Marmara Region. ![]() Likewise, the result obtained for the fault mechanism of 1963 Çınarcık Earthquake showed normal fault mechanism with much shallower depth than estimated before. For the first time, the fault mechanisms for -14:41 and 16:20 Earthquakes were determined using moment tensor inversion from the original seismic waveforms. Furthermore, moment tensor inversion method was applied on these earthquakes by using original seismograms, which provided an opportunity to illuminate the seismotectonic features of Marmara Region based on the retrieved fault mechanism solutions. Another finding is that the 1963 event was located at 40.80N–29.18E, near the Princes’ Island fault. The epicenter determinations show that the first event in was located at 40.72N–27.72E, while the second one occurred at 40.61N–27.43E, indicating that both were located near the Marmara Island. ![]() The epicentral locations have been calculated using available readings from original records and also ISS and seismic station bulletins for -14:41 and 16:20 Marmara Island–Erdek Earthquakes and -16:58 Çınarcık Earthquake. In this study, the original seismograms of the 1935-Erdek–Marmara Island and 1963-Çınarcık Earthquakes, recorded at local and regional distances, were vectorized.
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