UTC), an earthquake with a magnitude of Mw = 6.8 has occurred in Sivrice district of Elazığ (Eastern Turkey). Focal mechanism solution is consistent with pure left-lateral strike-slip faulting; the location of the epicenter and fault mechanism suggest deformation along the Pütürge segment of the East Anatolian Fault Zone. A 10-day fieldwork was carried out along the Pütürge segment to study surface deformation; the geometry of the surface rupture and other seismic geomorphological structures were mapped and studied in detail. The field data are also correlated with satellite images. This paper, therefore, presents classification of seismic geomorphological structures and discuss intimate relationship between fault geometry and stress field in the region. Seismic geomorphological deformation and related features of the Sivrice (Elazığ) earthquake are observed in the area between Gezin (Elazığ) and Ormaniçi (Pütürge) villages; they are classified into two as seismotectonic and seismo-gravitational features. Field observations confirm that seismo-gravitational structures develop along both Gezin-Sivrice-Doğanbağı and Doğanbağı-Çevrimtaş-Ilıncak-Koldere-Ormaniçi sections of the Pütürge segment, while surface rupture is mapped as seismotectonic structure only along the Doğanbağı-Çevrimtaş-Ilıncak-Koldere-Ormaniçi section. Small-scale landslides, rock falls, feather cracks along asphaltic roads, and laterally discontinues ground failure-related features are common seismo-gravitational structures that developed along the fault zone. In addition, small-scale lateral spreading and liquefaction structures are common especially in areas where fault-perpendicular streams meet the Karakaya Dam reservoir. The surface rupture is mapped as stepping and overlapping en échelon fractures along elongated pressure ridges between Çevrimtaş and Doğanbağ villages, to northwest of Ilıncak village, along 1.5-km-long pressure ridge between Topaluşağı and Doğanyol, across the elongated hill that developed on an alluvial fan to the northwest of Doğanyol and in the area between Koldere and Ormaniçi villages. Surface fractures deforming the pressure ridges are all aligned parallel to the long axes of the ridges and display reverse components that give rise to small-scale pop-up structures. Interferometric SAR (DInSAR) studies indicate a 10-cm uplift in the northwestern block of the fault and a 6-cm subsidence in the southeast block. The difference in vertical movements between two blocks of the fault is interpreted to suggest that at least 30-km-long section of the Pütürge segment in the area between southwest of Sivrice and Pütürge is broken during the main shock. Although the focal mechanism solution of the main shock gives pure left-lateral strike-slip faulting, there is no significant left-lateral displacement observed during the fieldwork. This can be explained by the following: (1) left-lateral strike-slip displacement was not able to reach the surface; (2) left-lateral torque movement of the fault around a vertical axis during the earth...

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ÖZETAnkara ili genel olarak depremsellik ve deprem tehlikesi açısından güvenli bir yer olarak bilinir. Fakat son yıllarda meydana gelmiş olan depremler ve yapılan çalışmalar bunun böyle olmayabileceğini göstermeye başlamıştır. Bu nedenle güncel verilerin ve çalışmaların ışığı altında bölgenin depremselliğinin ve deprem tehlikesinin yeniden gözden geçirilmesi gerekmektedir. Çalışmanın amacı, deterministik (tanımsal) yöntemle Ankara ilinin deprem tehlikesini belirlemek ve deprem tehlike haritasını hazırlamaktır. Bu çalışma ile deterministik yöntem kullanarak, on dört kaynak bölge ve iki farklı azalım ilişkisinden yararlanarak ana kayada oluşabilecek maksimum yer ivmeleri hesaplanmış ve Ankara il sınırları içinde oluşabilecek maksimum yer ivme değerlerinin 0,1 g ile 0,6 g arasında değişebileceği bulunmuştur.Anahtar Kelimeler: Ankara, deprem tehlikesi, deterministik yöntem DETERMINISTIC SEISMIC HAZARD ASSESSMENT FOR ANKARA, TURKEY ABSTRACTMostly, The province of Ankara is known as a safe place in terms of seismicity and earthquake hazard. However, the earthquakes that have occurred in the recent years, and the studies have begun to show that it may not be such. Therefore, the seismicity and the seismic hazard of the region should be revised on the basis of current data and studies. The aim of this study is to determine the seismic hazard and to prepare an earthquake hazard map of Ankara by using the deterministic method. Deterministic seismic hazard analysis is applied for the province of Ankara and peak ground acceleration values at rock sites are determined by using two different the attenuation relationships and fourteen seismic source areas. In this study, peak ground acceleration values at rock sites is estimated to range from 0.1 to 0.6 g for Ankara province.

IntroductionAnkara is situated in the Central Anatolia Region (Figure 1) with a population of 4,842,136 in 2012, which is equivalent to 6.4% of the total population of Turkey. It is the second largest city in Turkey. There are 25 districts in Ankara and 96% of Ankara's population lives within the investigated area.The city is surrounded by 4 main fault lines: the North Anatolia Fault Zone (NAF) in the north, the Ezinepazarı Fault in the east, the Tuzgölü Fault Zone in the southeast, and the İnönü-Eskişehir Fault Zone in the west and south-west. These faults have the potential to create an earthquake with magnitudes of greater than 7.0 on the Richter scale (M ≥ 7.0). This is a very important seismic threat to Ankara. In addition to these main faults, there are numerous active faults within the province and its surroundings, including the city centre. These additional active faults can cause small-to medium-scale earthquakes (5.0 < M < 6.0) with possible losses.Few people believe that there is a seismic hazard in Ankara as the city has not experienced large devastating earthquakes in recent history. However, the active fault lines surrounding the city clearly pose a substantial threat, which this study set out to explore in detail. The Van earthquake of 23 October 2011 resulted in a strong political will for 'urban transformation' . It is also well known that most of the current building stock in Turkey is highly vulnerable to earthquakes and needs to be reconstructed or retrofitted. The probabilistic results published in this study can also be used by policymakers to prepare efficient hazard mitigation plans for Ankara. This paper provides background information on existing studies and details of the region. Next, the methodology is presented. Results and suggestions conclude the paper.Ankara is situated in a fourth-degree earthquake hazard zone [i.e. expected peak ground acceleration (PGA) is 0.1-0.2 g] according to the current official seismic hazard zonation map of Turkey, which was published in 1996. During the preparation of this map, Turkey was divided into 17 source regions. Using a probabilistic approach, the map was produced to show any 90% nonexceedance probability of PGA over a 50-year period.

illerinden toplam 80 okul pilot okul olarak seçilmiştir. Proje başlaması ile birlikte oluşturulan üç çalışma grubundan birincisi projenin yürütülmesi ve yaygınlaştırılması, ikincisi Japonya ve Türkiye arasındaki müfredat karşılaştırması, eğitim materyallerinin değerlendirilmesi ve sınıf içi etkinlik planlarının hazırlanması, üçüncü ve son grup da okullardaki Afet ve Acil Durum Planlarının yeniden düzenlenmesi ve daha efektif olarak hayata geçirilmesi için çalışmalar yapmıştır. Proje kapsamında sırasıyla "Temel Afet Bilgileri", "Afet Eğitimi Etkinlikleri", "Okul Afet ve Acil Durum Yönetimi Planlama Kılavuzu", ve "Afet Eğitiminde Öğretmen Eğitimin Değerlendirilmesi" konulu dört adet kitap hazırlanmış ve başta pilot illerdeki pilot okullar olmak üzere birçok okula dağıtılmıştır. Amacımız proje kapsamında yapılan çalışmalar ve faaliyetler, hazırlanmış olan kitaplar ve elde edilen sonuçlar hakkında bilgiler vermek ve bu yönde yapılacak çalışmalara katkı sağlamaktır.