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9.22 Strozzi T., Werner C., Wiesmann A., Wegmüller U.: A portable radar interferometer for the measurement of surface deformation 9.23 Thüring M.: Rockfall modelling applied to rockfall protection design 9.24 Thüring M., Cannata M., Hammer J.: Hazard and risk assessment of landslides on accumulation reservoirs – a field applicable scheme 9.25 Troisi C.: Landslide investigation by means of PSiNSARTM radar interferometry:the Piemonte experience 9.26 Vouillamoz N., Mosar J.: Microzonage sismique du Canton de Fribourg: Carte de Sol de fondations 9.27 Zechner E., Lewin I., Konz M.: Effects of tectonic structures, groundwater pumping, and mining activity on evaporite subrosion and resulting land subsidence .1 Paleoseismological studies on Yedisu seismic gap, eastern part of North Anatolian Fault, Turkey H. Serdar Akyüz*, Taylan Sançar**, Cengiz Zabcı*, Pınar Gutsuz**, Volkan Karabacak***, Erhan Altunel***, Ziyadin Çakır*, Çağlar Yalçıner*** *Istanbul Technical University, Faculty of Mines, Department of Geology, 34469, Maslak, Istanbul (akyuz@itu.edu.tr) ** Istanbul Technical University, Eurasia Institute of Earth Sciences, 34469, Maslak, Istanbul ***Eskisehir Osmangazi University, Engineering Faculty, Department of Geology, 26480, Eskisehir North Anatolian Fault (NAF) is one of the most active major faults in Europe. It has a general E-W trend with about 1500 km length throughout northern Turkey and 22 ± 3 mm / year slip rate. During 20 th century it is almost totally broken except two important seismic gaps; Marmara Seismic Segment in the west and Yedisu Seismic Segment in the east (Figure 1). This paper presents paleoseimological studies on Yedisu Seismic Segment (YSS). YSS locates on eastern part of North Anatolian Fault between Erzincan city and Yedisu town of Bingöl city (Figure 2). Western part of the YSS was broken in 1992 with a Ms=6.8 earthquake while eastern part was broken in 1949 with Ms=6.7 earthquake (Figure 1). A 80 km-long fault is remained unbroken between eastern part of Erzincan Basin and Yedisu town. According to Ambraseys & Finkel (1995) this part of the fault was broken lastly in 1784, i.e. 224 years ago. The aim of this study which is supported by TUBITAK (The Scientific & Technological Research Council of Turkey, Project no: 106Y174) is to reveal seismic risk of YSS with paleoseismological data. The fault geometry, segmentation and offset structures were analysed firstly on aerial photographs and topographical maps, then observed and drown in the field on a 1/25000 topographical map. Three trench sites were also defined in convenient places. First site was chosen in the western part of the YSS, Sarikaya site (Figure 2). Trench was opened perpendicular to the fault trace and trench wall was logged. Fine grained slope deposits and fault branches indicate two earthquake evidences. Second and third trench sites are close to eastern end of YSS (Figure 2). Karapolat Trench was opened perpendicular to fault on distal part of a large recent fan deposits. Trench stratigraphy evidenced two past earthquakes as well. The last trench, named as Tokmanik, was digged deeper due to convenient underground water level. At least 5 past earthquake events were determined on the trench walls. Charcoal samples collected in critical level in all trenches were sent to Arizona University Radiocarbon Laboratory for dating. Dating results together with historical records will give us earthquake recurrence period of Yedisu Seismic Segment. If the date of past earthquakes have periodical behaviour, this will help to predict the date of future earthquake on Yedisu Fault. REFERENCES Ambraseys, N.N. & Finkel, C.F. 1995: The Seismicity of Turkey and adjacent areas: a historical review, 1500-1800. Eren, Istanbul, p 240. Barka, A., Akyüz, H.S., & 18 others, 2002: The surface rupture and slip distribution of the August 17, 1999 ²zmit earthquake, M=7.4, North Anatolian Fault. Bull. Seism. Soc. Amer. 92, 43-60. 2 1 Symposium 9: Natural Hazards and Risks
2 2 Symposium 9: Natural Hazards and Risks Figure 1. 20 th century destructive earthquakes (Barka et al. 2002) and seismic gaps on North Anatolian Fault. Figure 2. The geometry of Yedisu Seismic Segment and location of trench sites. .2 Biomarkers as effective and beneficial tools in petroleum caused natural hazards Alizadeh Bahram*, Bagheri Soheila* & Hoseini Seyed Hossein * *Department of Geology, Faculty of Science, S. Chamran University, Ahvaz, Iran. (alizadeh@scu.ac.ir) In the Zagros oil rich basin comprising more than 40 huge and ten giant oilfields, unavoidebla natural hazards sometimes even force people to evacuate their homes. The aim of this study was to determine the genetic origin of oil seepages occurring in Masjid-e-Soleiman (MIS) oilfield and in Dalaki river near Nargesi oilfield. In order to inject gas in the Nargesi Oilfield (South Dezful Embayment), and at the same time prevent natural disaster it is necessary to establish the origin of oil seeps polluted with H 2 S in Dalaki area. Numerous oil seep polluted with H 2 S have been found in Masjid-e-Soleiman oilfield (first oilfield in the Middle East, North
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