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    Palaeoearthquakes on the Kelkit Valley Segment of the North Anatolian Fault, Turkey: Implications for the Surface Rupture of the Historical 17 August 1668 Anatolian Earthquake
    (SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2011) Zabci, Cengiz; Akyuz, Husnu Serdar; Karabacak, Volkan; Sancar, Taylan; Altunel, Erhan; Gursoy, Halil; Tatar, Orhan
    The 26 December 1939 Erzincan (M-s = 7.8) and 20 December 1942 Erbaa-Niksar (M-s = 7.1) earthquakes created a total surface rupture more than 400 km between Erzincan and Erbaa on the middle to eastern sections of the North Anatolian Fault. These two faulting events are separated by a 10-km-wide releasing stepover, which acted like a seismic barrier in the 20(th) century. To understand the rupture behaviour in this structurally complex section of the North Anatolian Fault, we undertook palaeoseismological trench investigations on the Kelkit Valley segment where there is little or no palaeoseismic information. We found evidence for three surface faulting earthquakes predating the 1939 event during the past millennium in trenches excavated in Resadiye and Umurca. In addition to the 1939 Erzincan earthquake, prior surface ruptures are attributed to the 17 August 1668, A.D. 1254 and A.D. 1045 events. Surface rupture of the 17 August 1668 Anatolian earthquake was previously reported in palaeoseismological studies, performed on the 1944, 1943, and 1942 earthquake fault segments. We suggest that the surface rupture of this catastrophic event jumped the 10-km-wide releasing stepover in Niksar and continued eastward to near Koyulhisar. The existence of different amount of off sets in field boundaries (sets of 4 m, 6.5 m, and 10.8 m) was interpreted as the result of multiple events, in which the 1939, 1668, and 1254 surface ruptures have about 4, 2.5, and 4 metres of horizontal coseismic slip on the Kelkit Valley segment of the North Anatolian Fault, respectively.
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    Paleoseismological Findings on the Ortakoy-Susehri Segment of the 1939 Erzincan Earthquake Surface Rupture, North Anatolian Fault Zone
    (Tmmob Jeoloji Muhendisleri Odasi, 2012) Polat, Ali; Tatar, Orhan; Gursoy, Halil; Karabacak, Volkan; Zabci, Cengiz; Sancar, Taylan
    The study area is located within the Susehri-Golova basin on eastern part of the North Anatolian Fault Zone (NAFZ). Great devastating earthquakes have been occurred on this highly active seismic fault zone in near historical period. The last great earthquake causing loss of many life and properties was occurred on 27 December 1939 in Erzincan along the eastern part of the NAFZ. This earthquake has created hundreds of kilometers surface rupture, and can also be traced in the study area. Significant information is obtained by early paleoseismological studies carried out especially on the middle and western parts of the NAFZ proving important data about earthquake return periods and magnitudes of seismic activity in the period. Paleoseismological studies on eastern part of the NAFZ are less than western part of the NAFZ. In this study, three trenches were excavated on the 1939 Erzincan earthquake surface rupture. These trenches are located from west to east, in Eskibag, Asagiyenikoy and Asagitepecik villages. Eskibag trench was excavated on a sag pond to the southeast of Sevindik and northeast of Eskibag villages. Asagi Tepecik trench was excavated on the same lineament to the northeast of Asagiyenikoy where a clear fault morphology is observed. The Asagi Tepecik was excavated 2.5 km southeast of the Lake Sut. These trench data are significant because of showing data of large earthquakes repeated during Holocene times. Beside the fact that 1939 surface rupture was observed, the earthquake ruptures formed before 1939 were also observed on trench logs. It is showed that 1939 earthquake surface rupture follows older ruptures and reveals the existence of several different seismic activities prior to 1939 earthquake.