Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2025Earthquake Hazard in Urban Areas of Bursa Province: Paleosismological Properties of the Ulubat, Bursa and İnegöl Active Faults
Karabacak, Volkan; Sançar, Taylan
This study provides a detailed mapping of active fault segments in Bursa and its surrounding regions, along with a comprehensive analysis of seismic behavior derived from paleoseismological data. As one of T & uuml;rkiyes' strategic economic centers with a dense population and industrial infrastructure, Bursa requires a holistic seismic risk assessment for effective disaster preparedness and mitigation. Paleoseismological analyses of the eastern segment of the Ulubat Fault indicate that it has been in a seismic quiescence period for approximately 1855 years. This prolonged period of inactivity highlights the potential for a large earthquake in the future around the Nil & uuml;fer Region of Bursa. Trench investigations conducted in Bursa city-centre reveal that the Bursa Fault has produced at least six surface ruptures over the past 12000 years, recurring approximately every 2000 years. Additionally, trench studies on the & Idot;neg & ouml;l Fault indicate that the & Idot;neg & ouml;l Fault has produced at least five surface ruptures over the last 12000 years, with the most recent major earthquake occurring more than 2500 years ago. Obtained results emphasize the potential for the Bursa and & Idot;neg & ouml;l faults to rupture simultaneously or in close succession, possibly triggering one another. Thus, the surface rupture caused by the 1855 Bursa earthquake is evaluated to have potentially triggered stress accumulation along the & Idot;neg & ouml;l Fault. This situation reveals a high probability of a surface-rupturing earthquake (M=6.2-6.9) occurring at any time on the & Idot;neg & ouml;l Fault, after 2500 years of seismic silence. Overall, these findings underscore the critical role of the faults in Bursa and its surroundings within the regional seismicity. In particular, the potential for sequential ruptures along the Bursa and & Idot;neg & ouml;l faults presents a significant earthquake hazard. This comprehensive analysis contributes to a deeper understanding of the seismotectonic dynamics of the region, providing valuable insights for seismic hazard assessment and risk mitigation efforts.
AtıfWoS2OpenAlex3
İncele - MakaleYalnız künye2025Scopus SJRQ2Morphometric constraints on tectonic activity and landscape evolution in the Uludağ Range, NW Türkiye
Sançar, Taylan; Karabacak, Volkan
The Uluda & gbreve; Range of northwest T & uuml;rkiye forms a key tectonic boundary between the North Anatolian Fault Zone and the Western Anatolia Extensional Region, where active deformation is expressed across a network of strike-slip and normal faults. To investigate how fault segmentation and kinematics control landscape evolution in this complex orogen, we integrate high-resolution morphometric analysis with paleoseismological data. We extracted key morphometric indices-including Delta-relief, Delta-elevation, Delta-gradient, Delta chi, hypsometric integral, channel concavity (m/n), normalized channel steepness (ksn), and knickpoint distribution-from 10-meter DEMs using open-source geomorphic toolkits. Our results demonstrate pronounced spatial variability in geomorphic signatures and tectonic activity across four divide segments (DS). DS01, associated with the right-lateral Ulubat Fault, exhibits exceptional morphometric stability and minimal disequilibrium, in line with long earthquake recurrence intervals and low Holocene slip rates. In contrast, DS02 and DS03-bounded by the Bursa and So & gbreve;ukpinar faults-display chi-based divide migration and subtle landscape adjustment. DS04, influenced by the & Idot;neg & ouml;l and Oylat faults, is characterized by elevated channel steepness, dense knickpoint clustering, and southward divide migration, collectively indicating ongoing uplift and transient drainage adjustment. The strong correspondence between morphometric disequilibrium and documented earthquake recurrence patterns highlights the critical value of integrating geomorphic and paleoseismological datasets. Our findings demonstrate that only through the convergence and cross-validation of multiple independent metrics can the segmented imprint of active deformation be reliably detected-particularly where landscape response is temporally offset from fault activity. The methodological framework developed here provides a robust template for quantifying active structures and their geomorphic consequences and can be widely applied to other tectonically complex mountain belts for seismic hazard assessment and landscape evolution studies.
AtıfWoS2OpenAlex2İncele - MakaleAçık Erişim2023Scopus SJRQ2Paleoseismology of the Ganos segment; the western extend of the North Anatolian Fault (Turkey)
Aksoy, Murat Ersen; Meghraoui, Mustapha; Ferry, Matthieu; Çakir, Ziyadin; Uçarkuş, Gülsen; Sançar, Taylan; Altin, Mehmet Uğur
The Ganos fault that ruptured on 9 August 1912 (Mw: 7.4) is the westernmost inland segment of the North Anatolian fault (NAF). Here, the Ganos fault is bounded at its two tips with offshore faults segments, in the Sea of Marmara to the east and the Gulf of Saros to the west in the North Aegean Trough. Therefore, the paleoseismology of the 45-km-long inland fault is of importance to the seismic hazard analysis related to offshore active faults and in particular for the seismic gap in the Marmara Region. Earlier studies have established an earthquake chronology for the western and eastern inland tips of the Ganos fault. Here, we extend the paleoseismic studies toward the central segment. Three trenches at Yörgüç have revealed evidence for two faulting events, possibly post-1669 CE ±30 years, which can be correlated to the 1659 or 1766, and the 1912 historical earthquakes. At Yeniköy, we determined an offset of 46 ± 1 m and 47 ± 1 m on a stream channel and a ridge-crest, respectively. In two trenches we determined two faulting events for the last 1000 years and seven events for the last 3500 years. In trench T5, the base of the displaced stream channel provides a calibrated date of 829–591 BCE. Using the 46 ± 1 m right-lateral displacement, we calculate a slip rate of 16.9 ± 0.7 mm/year for the last 2732 ± 119 years. A combined analysis with earlier paleoseismic studies on the Ganos fault suggests that the historical earthquakes of 1912, 1766b or 1659, 1354 or 1343a, and 1063 ruptured the entire inland fault section. In such a case, the recurrence interval for this section of the NAF corresponds to 283 ± 81 years. Combining earlier estimations, we suggest an average slip rate of 17.1 ± 0.9 mm/year for the last 2700 years and observe a characteristic slip behavior of 4.5 to 5 m per event for this section of the North Anatolian plate boundary fault.
AtıfScopus1OpenAlex2
İncele - MakaleAçık Erişim2023Scopus SJRQ2Internal deformation of continental blocks within converging plates: insights from the Ovacık Fault (Anatolia, Türkiye)
Zabci, Cengiz; Sançar, Taylan; Tikhomirov, Dmitry; Ivy-Ochs, Susan; Vockenhuber, Christof; Friedrich, Anke M.; Yazici, Müge; Akçar, Naki
The active tectonics of Anatolia is mostly characterized by its westward motion with respect to Eurasia between the Hellenic subduction in the west and Arabia-Eurasia continental collision in the east. Although most of the deformation is suggested to be confined along Anatolia’s boundary elements, viz. the North and East Anatolian shear zones, recent studies indicate a higher magnitude of internal strain accumulation, especially along the parallel/subparallel strike-slip faults of its central province. We present the first morphochronology-based slip rate estimate for one of these strike-slip structures, the Ovacık Fault, by using cosmogenic36Cl dating of offset fluvial deposits. At the Köseler Site (39.3643°N, 39.1688°E), two faulted risers, bounding the alluvial fan with its subplanar surface (NF1/NF1’) and the inset terrace tread (NF1/T2), are offset 19–24 and 15–22 m, respectively. The scattered surface ages and variability of 36 Cl concentrations in depth profiles suggest strong evidence for inheritance in alluvial fan and terrace deposits; thus, we used modelled depth-profile ages for both surfaces. The modelled ages 8–10 ka for NF1 and 6–8 ka for T2 yield slip-rate estimates 2.4 +0.5/–0.4 mm/a and 2.8 +0.7/–0.7 mm/a, respectively, for the upper-tread reconstruction of the NF1/NF1’and the lower-tread reconstruction of the NF1/T2. Our results together with previous slip-rate estimates for other structures show a significant internal deformation for Anatolia, especially along its subparallel strike-slip faults. These secondary faults slice Anatolia into several pieces giving rise to the formation of the Malatya-Erzincan, Cappadocian, and Central Anatolian slices, where the geometry is strongly controlled by the distribution of the Tethyan accretionary complexes.
AtıfScopus3OpenAlex3TR Dizin1İncele - MakaleYalnız künye2022Scopus SJRQ1When did the North Anatolian fault reach southern Marmara, Turkey?
Karabacak, Volkan; Sançar, Taylan; Yildirim, Gökhan; Uysal, I. Tonguç
We dated syntectonic calcites on fault planes from the southern branch of the western North Anatolian fault (NAF) in northern Turkey using U-Th geochronology. We selected strike-slip faults that are kinematically related to the current regional strain field. The isotopic ages cluster around different periods during the past ~700 k.y. The most prominent cluster peak of 510.5 ± 9.5 ka (1σ) is consistent with the maximum cumulative strike-slip offset data and tectonic plate motions measured by GPS data, highlighting the fact that the present configuration of the NAF in the southern Marmara region started at ca. 500 ka or earlier. These new isotopic ages, combined with previous considerations of regional tectonics, reveal that faulting along the western NAF initiated primarily in the southern Marmara region at least a few hundred thousand years earlier than the timing suggested for the northern branch of the western NAF. This study presents an innovative approach to constrain the timing of initiation of currently active fault segments along the NAF in southern Marmara. U-Th geochronology of fault-hosted calcite thus has a wide application in determining absolute ages of fault episodes in wider shear zones along plate boundaries
AtıfScopus26OpenAlex27İncele - MakaleAçık Erişim2021The Relationship of the Hot and Mineral Springs in Munzur and Pülümür Valleys (Tunceli) with the Tectonic Structures of the Region and their Hydrogeochemical Properties
Sançar, Taylan; Önal, Ayten Öztüfekçi
The N-S flowing Munzur and Pülümür Rivers, which have the largest drainage areas in Tunceli Province, merge in the city center, and continue as a single river towards the south. In the southern area, there are smaller drainage areas such as Dinar and Rabat. In this study, the hydrogeochemical properties of the hot and mineral springs located in the mentioned drainage areas and the relationship of these springs with the faults in the region were investigated. The most important structural element controlling the reaching of hot and mineral springs to the surface is the primary and secondary deformation structures of the right lateral strike-slip Nazımiye Fault Zone. PermoCarboniferous aged impermeable schists form the basement rocks in the area hydrogeologically. Permian aged marble and crystallized limestones are the reservoir rocks of the hot and mineral waters which are outcropped in the drainage areas of Munzur and Pülümür Rivers. The presence of Eocene-Miocene aged semi-permeable flysch and permeable limestones cover rocks in this recharge area of the reservoir rocks indicates that the system is open. The pH and electrical conductivity of the hot and mineral waters in the system change between 5.96-6.80 and 2231-2930 μS/cm, respectively. Temperature of these waters varies between 35 to 20°C when they reach up to the surface. The total amount of dissolved solids ranges from 1300 to 1600 mg /L. The most abundant cation present in the waters is Ca+2; the most abundant anion is HCO3-. The Na-K-Mg geothermometer results of the hot and mineral waters correspond to the immature waters where the water-rock relationship is not an equilibrium. The pH and electrical conductivity of the cold waters are between 6.66 to 7.28 and 471 to 891 μS/cm, respectively. All waters examined here are of the Ca-Mg HCO3 type
AtıfOpenAlex3İncele - MakaleYalnız künye2021Scopus SJRQ1Morphometric investigations on the NW Bitlis-Zagros mountain range (SE Turkey): Implications for the internal deformation of the western Turkish-Iranian Plateau
Sançar, Taylan
Collision of the Arabian and Eurasian plates has resulted in uplift of the Turkish-Iranian Plateau, where debate continues over how post-collisional convergence is being converted to strain. The internal deformation models of the plateau have taken into account the distribution of deformation in the NW-trending Bitlis-Zagros Mountain Range (BZMR), the southern boundary of the collision. The western end of the BZMR is marked by contrasting topographic relief resulting from the coupling of tectonic and erosional processes. This region providing an excellent record for undertaking quantitative analysis which can improve our understanding of its tectonic evolution. Mountain front analyses reveal that each fault segment located in front of the western BZMR falls within the limits of Class-1 that corresponds to an uplift rate of >0.5 mm yr(-1). Hypsometric and basin asymmetry analysis were analyzed for 93 drainage basins, indicating that weakly to moderately eroded basins can be moderately to strongly asymmetric but show no uniform tilting direction. Channel concavity, integral and knickpoint analyses suggest that, apart from the thrust fault that represents the margin of the collision zone, there is no pronounced single geological constraint that causes differential tectonic uplift and furthermore implies that the effect is distributed across multiple different structures. The findings of this study suggest that continuous lower rate horizontal displacement has occurred in this region since the onset of collision, but also indicates that the western end of the BZMR represents a zone of higher convergence, in which shortening is being converted to the vertical plane strain.
AtıfWoS6OpenAlex8İncele - MakaleYalnız künye2021Scopus SJRQ2Palaeoseismic behaviour of strike-slip faults in slowly deforming regions: palaeoearthquakes and long-term slip history of the Ovacik Fault (eastern Turkey)
Yazici, Muge; Zabci, Cengiz; Natal'in, Boris A.; Sançar, Taylan; Akyuz, H. Serdar
The Ovacik Fault (OF) is one of the internal structures of the Anatolian Block, located close to its eastern boundary. Although it shows a very clear surface trace, there are no instrumentally recorded surface rupturing earthquakes on this fault. This study concludes results of the first palaeoseismological trench study on the OF with the evidence for three surface rupturing earthquakes for the last 6 kyr. Structural, stratigraphical and geochronological constraints show that the oldest event happened between 4700 and 3022 BCE, whereas the penultimate event was between 2262 and 1643 BCE. The youngest event happened after 56 BCE, which we could only delimit from below because of the absence of any dateable material from the upper layers of the relevant horizons. The derived mean interevent time of these three palaeoevents is 2400 +/- 765 years. We could not correlate any of these palaeoevents with historical earthquakes due to the absence of records in catalogues for the region of interest. Moreover, we used cumulative offsets of the major drainages to calculate the long-term slip rate of 2.7 mm/year since the Pliocene, which exceeds slip rates of other internal faults of Anatolia almost by the factor of two. Our results do not only show significant deformation for the internal parts of Anatolia but also point out a seismic potential of the OF.
AtıfWoS5OpenAlex5İncele - MakaleAçık Erişim2021Scopus SJRQ2Tectonic geomorphology of the yatağan fault (Muğla, sw turkey): Implications for quantifying vertical slip rates along active normal faults
Basmenji, Mehran; Sançar, Taylan; Dikbaş, Aynur; Boulton, Sarah J.; Akyüz, Hüsnü Serdar
South Western Anatolia is dominated by E-W and NW-SE trending active faults. The dip-slip Yatağan Fault is one of these active structures that trends in a NW direction for ~30 km. To assess the relative tectonic activity of the Yatağan Fault, two geomorphic segments were defined along the fault: the FS-1 (northern segment) and the FS-2 (southern segment). The vertical slip rate pattern of the fault was analyzed using steepness indexes, chi (χ) plots, and log-log slope area graphs. Results of the analyses indicate that the steepness of the streams draining the footwall reveal increasingly higher values downstream along the fault. All of the main basins contain at least one slope-break knickpoint associated with tectonic uplift. Facet morphology-based investigations using empirical methods along faceted spurs of the Yatağan Fault indicate vertical slip rates of 0.16 ± 0.05 mm/year and 0.3 ± 0.05 mm/year for the FS-1 and the FS-2, according to relationship of facet slope angle (Rsa ). Additionally, using the facet basal height relationship (Rbh ) we calculated slip rates of 0.24 mm/year and 0.36 mm/year for the FS-1 and the FS-2 segments, respectively. Mountain front sinuosity analysis yields values of 1.34 and 1.2, while the ratio of valley-floor width to valley height gives values of 0.64 and 0.24 for the FS-1 and the FS-2 respectively, indicating typical active mountain front where the uplift rates are ≥ 0.5 mm/year. Hypsometric analysis suggest a transition from mature to older stage for catchments along the Yatağan Fault. Comprehensive interpretation of the results from morphometric analysis, vertical slip rate calculations, and data based on field observations suggest preponderance of tectonic activity over erosional process along the Yatağan Fault. Our analyses reveal that the rate of the tectonic activity gradually increases from the FS-1 to the FS-2 along the fault.
AtıfScopus4İncele - MakaleAçık Erişim2020Anthropogenic Pollution Assessment of Pertek (Tunceli) Geothermal Field
Balaban, Tugbanur Ozen; Okan, Ozlem Oztekin; Sançar, Taylan; Önal, Ayten Oztufekci
The study area is located in Pertek town in Tunceli province in Eastern Anatolia. The geology of the study area is very important for the geodynamic evolution of the Eastern Taurus. Geological formations in the study area are Paleozoic Keban metamorphics, Upper Cretaceous Harami Formation, Middle-Upper Eocene Kirkgecit Formation, Upper Miocene Karabakir Formation, and Quaternary alluvium, from the oldest to the youngest, respectively. Hydrogeological units were divided into three units in accordance with lithological, structural and hydrogeological properties. The basement of the study area of sandstone, marbles and dolomitic marbles in the Keban metamorphic rocks are highly fractured and karstified and act as the main reservoir in particular for thermal waters in the study area. Kirkgecit and Karabakir Formations occur as barrier rocks in the geothermal area due to impermeable properties. Some levels of limestone units within the Keban metamorphics are aquifers for freshwater. Alluvium is the most important and suitable unit for cold groundwater production. In the study area, streams and rivers flow from southwest to northeast towards Keban Dam Lake. The lake is very important in the region from the point of view of hydroelectric power production, flood control, and irrigation. The thermal and mineral waters generally have high mineral contents. When they are discharged onto the surface, they can cause contamination in surface water, ground water, and of soil. Because of the fact that the water resources in the region are used for drinking and irrigation purposes, the quality of the water is evaluated within the scope of this study. For this reason, water and sediment samples were analyzed for boron, arsenic and other contaminant (Pb, Fe, Sb, Sn and Hg) substances to measure the contamination. The results acquired from the analysis of water samples suggest that concentrations of B, As and Pb in some of the samples exceed the limits of the TSE drinking-water standards(>100 ppb). Fe concentration is 2.16 ppm, Hg and Sb concentrations are also 0.05 ppm. Moreover, some of the sediment samples collected from thermal springs in Singec Creek are contaminated with B, As, Sb, Hg and Pb and other elements sourced from geothermal fluids. In this study, the geochemical evaluation of the presence of B, As, and other contaminants (Pb, Fe, Sb, Sn) derived from geothermal activities within sediment and water in the Pertek Geothermal Field and surrounding area were discussed.
AtıfWoS2OpenAlex2TR Dizin2İncele - MakaleAçık Erişim2020Scopus SJRQ1Geodynamic importance of the strike-slip faults at the eastern part of the Anatolian Scholle: Inferences from the uplift and slip rate of the Malatya Fault (Malatya-Ovacık Fault Zone, eastern Turkey)
Sançar, Taylan; Zabcı, Cengiz; Akçar, Naki; Karabacak, Volkan; Yeşilyurt, Serdar; Yazıcı, Müge; Serdar Akyüz, H.; Önal, Ayten Öztüfekçi; Ivy-Ochs, Susan; Christl, Marcus
Controversy remains over when present-day configuration of the Anatolia boundary faults came into existence, and the issue of what are the driving forces of the Anatolian westward motion. The NW-striking dextral and NE-striking sinistral second-order strike-slip faults at the eastern part of the Anatolian Scholle play a crucial role within these long-lasting discussions, and the NE-striking sinistral Malatya–Ovacık Fault Zone (MOFZ) is particularly important in this ongoing debate. Although the MOFZ is defined as one of the intra-plate structures, it has been proposed that it was an inter-plate fault between the Anatolia and Arabian plates from the latest Miocene to mid-Pliocene and that it has been inactive during the last ca. 3.5 Ma. This study provides results from the first morphochronology-based uplift and slip rate estimates on the Malatya Fault within the southern section of the MOFZ. The cosmogenic isochron burial and cosmogenic depth burial of ages from the sinistrally offset Tohma River remnant terraces enabled us to calculate 1.0 ± 0.01 and 1.12 ± 0.01 mm/yr minimum and maximum horizontal slip rates, respectively, for the last 1.4 ± 0.1 Ma. Furthermore, we conclude that the 96 ± 11 m/Ma mean uplift has been driven by the Malatya Fault. Integrated interpretation of the findings of this study and available data on both the MOFZ and other strike-slip faults at the eastern part of the Anatolian Scholle support the hypothesis that they are plate-boundary related active deformation belts that originated from paleotectonic structures during the tectonic escape of the Anatolian Scholle.
AtıfScopus20OpenAlex20İncele - MakaleYalnız künye2019Scopus SJRQ2Geometry and Paleoseismology of the Malatya Fault (Malatya-Ovack Fault Zone), Eastern Turkey: Implications for intraplate deformation of the Anatolian Scholle
Sançar, Taylan; Zabci, Cengiz; Karabacak, Volkan; Yazici, Muge; Akyüz, H. Serdar
The sinistral Malatya-Ovack Fault Zone (MOFZ) is one of the outstanding intraplate deformation belts within Anatolia. The 165-km-long, NE-SW-striking Malatya Fault (MF), which constitutes the southern section of the MOFZ, is separated into five segments according to its surface geometry. These segments have evident morphotectonic features that reflect long- and short-term fault activity, such as morphologic structures offset by as little as 7m and as much as 7.3km. This study provides results from the first paleoseismological investigations on the MF. We find that the last earthquake occurred between 965 and 549 BCE and calculate a recurrence interval of 2275 +/- 605years from evidence for four paleo-events over the last 10ka. Considering fault segmentation and our paleoseismological data, we propose that the accumulated strain on the MF may cause a destructive earthquake (M=7.4) in the near future. Our results support the hypotheses that the MF and other NW-striking dextral and NE-striking sinistral strike-slip faults within the eastern part of Anatolia are plate boundary-related, active deformational structures.
AtıfWoS19OpenAlex29İncele - MakaleAçık Erişim2018Investigation of Uplift Rate History of the Yuksekova Basin (Southeast Turkey)
Sançar, Taylan
The 90 km long and N50 degrees-60 degrees W oriented right lateral Semdinli Yuksekova Fault Zone (SYFZ) is located at the southeast of the EACP. The most prominent morphotectonic structure of the SYFZ is the Yuksekova Basin that has a long axis striking in NW-SE direction with a length of 38 km and the maximum width of 10 km. In this study, morphometric indices were used to investigate the uplift characteristics of the basin. According to the Mountainfront sinuosity (S-mf) and the ratio of valley-floor width to valley-height index (V-f) calculations along the mountain fronts on the northern and southern margins of the Yuksekova Basin, the faults that delimit the basin margins have high activity, and the uplift rate is not less than 0.5 mm /yr. Spatial distribution of the m/n values of the drainage areas reveals that the SYFZ have driven the rock uplift around the basin rather than the large-scale lithospheric processes. The integral analysis (chi=chi) of the tributaries in the drainage areas located close to the faults that delimit the Yuksekova Basin indicate that the uplift rate of the basin changes over time regardless of the m/n ratio. The integral analyses of lithological units, which are resistant to erosion around the basin, reveal that uplift rate has been changed four times.
AtıfWoS3OpenAlex5İncele - MakaleYalnız künye2018Scopus SJRQ1The role of intraplate strike-slip faults in shaping the surrounding morphology: The Ovacik Fault (eastern Turkey) as a case study
Yazici, Muge; Zabci, Cengiz; Sançar, Taylan; Natalin, Boris A.
Although the westward extrusion of the Anatolian Block is mainly compensated along its boundary faults, the North Anatolian and the East Anatolian shear zones, it is internally deformed in a dominant manner by some strike-slip faults as well. To obtain a better understanding about this intraplate deformation of the Anatolian Block, we investigate the tectonic geomorphology of the Ovaak Fault (OF), which is the northeastern member of the Malatya-Ovaak Fault Zone (MOFZ). Further, we apply the most common geomorphic indices, such as the hypsometric curve and integral, longitudinal channel profiles, channel steepness and concavity, mountain front sinuosity, and valley height-width ratio to characterise and quantify the deformation along the OF and the surrounding region where the regional morphology is shaped with the joint effect of palaeo- and neotectonics and other morphological factors such as palaeoglacial processes. The highest hypsometric integral, steepness and concavity values are generally observed along the northeastern strand of the OF (the Munzur Mountains) and the Kemaliye Region. Further, we interpret that high HI and steepness values indicate a regional tectonic uplift because of either a change in fault geometry, which gives rise to the vertical component on the OF, or a regional high convergence zone. Furthermore, this study gives the first calculation of vertical uplift in the northern margin of the Ovacik Basin (OB) as at least 0.5 mm/y for long term deformation history. Thus, our results exhibit that the OF is one of the intraplate strike-slip faults of the Anatolian Block. (C) 2018 Elsevier B.V. All rights reserved.
AtıfWoS20OpenAlex22İncele - MakaleAçık Erişim2018Scopus SJRQ2Mechanics of plio-quaternary faulting around the Karliova triple junction: implications for the deformation of Eastern part of the Anatolian Scholle
Sançar, Taylan; Akyüz, H. Serdar; Schreurs, Guido; Zabci, Cengiz
AtıfOpenAlex10İncele - Proje2017Malatya Fayı (Malatya-Ovacık Fay Zonu)'nın Jeolojik KaymaHızının ve Eski Deprem Tarihçesinin Araştırılması
Karabacak, Volkan; Akçar, Naki; Akyüz, Hüsnü Serdar; Önal, Ayten Öztüfekçi; Zabci, Cengiz; Sançar, Taylan
Avrasya Levhası?na göre, Afrika ve Arabistan Levhaları?nın kuzeye ve Anadolu Bloku?nun batıya doğru olan hareketi Doğu Akdeniz?in karmaşık tektonik yapısının anlaşılmasında anahtar role sahiptir. Anadolu?nun batıya kaçışında ana deformasyon zonları Kuzey ve Doğu Anadolu Fay Zonları (KAFZ ve DAFZ) ile bu sırada Anadolu içerisinde meydana gelen önemli kıta içi deformasyonlar ise KB doğrultulu sağ yanal ve KD doğrultulu sol yanal doğrultu atımlı faylar ile temsil edilir. Daha önceden ileri sürülen hipotezlerin aksine, yakın zamandaki jeolojik, jeodezik çalışmalar ve mikro sismik aktivite Anadolu Bloku içerisindeki deformasyon sürecinin sürekli olduğuna işaret etmektedirler. 240 km uzunluğundaki Malatya Ovacık Fay Zonu (MOFZ), Anadolu Bloku içerisindeki KD doğrultulu sol yanal deformasyon kuşaklarından biridir. Önceki hipotezler MOFZ?nin sürekli bir deformasyon zonu olmadığını ve 3 milyon yıldan bu yana aktivitesini yitirdiğini ileri sürsede, fay üzerinde yapılan jeolojik, jeodezik çalışmalar ve mikro sismik aktivite bu görüşün aksini destekler. Bununla beraber, MOFZ?nin güncel deformasyon özellikleri hakkında az sayıda veri bulunurken paleosismik tarihçesi hakkında veri bulunmaz. TÜBİTAK 114Y580 numaralı proje kapsamında, Malatya Fayı (MF)?nın (a) morfokronoloji temelli kayma hızı, (b) paleosismik tarihçesi ve (c) uzun dönemli kayma hızı üzerine yoğunlaşılmıştır. Kozmojenik 36Cl, 26Al ve 10Be izotopları ile 1.700 m ötelenmiş Tohma Deresi taraçalarının yaşlandırılması, MF?nin son 1,4 milyon yıllık dönemi için ortalama 1,21 mm/yıl kayma hızına ve bölge için 92 ±11 metre/milyon yıl yükselim hızına işaret etmektedir. Kayma hızı değerinin elde edildiği segmentin kuzeyinde yapılan paleosismoloji çalışmalarının ortaya çıkardığı 2275±606 yıllık deprem tekrarlanma aralığı, GPS verilerine göre daha düşük olan kayma hızı değerini desteklemektedir. Malatya Fayı?nın kuzeyinde ölçülen ve en fazla birikimli atım değeri olan 7,3 km, son 1,4 milyon yıllık kayma hızı değerini yansıtan 1,21 mm/yıl ile oranlandığında MF?nin yaşı yaklaşık olarak altı milyon yıl olarak hesaplanır. Ancak morfometrik indis çalışmalarına göre, daha fazla deformasyon olan fayın kuzeyinde, kayma hızının da fazla olduğu düşünüldüğünde hesaplanan bu yaş MF için en yaşlı tarihtir.
- MakaleYalnız künye2017Scopus SJRQ2Palaeoseismic history of the eastern part of the North Anatolian Fault (Erzincan, Turkey): Implications for the seismicity of the Yedisu seismic gap
Zabci, Cengiz; Akyüz, H. Serdar; Sançar, Taylan
The North Anatolian Fault showed a remarkable seismic activity especially between 1939 and 1999, when the westward migrating earthquake sequence created surface ruptures more than 1000 km, leaving unbroken only the Marmara segments, to the west, and the Yedisu Segment, to the east along the main strand of the fault. To understand the palaeoseismicity of the Yedisu Seismic Gap, we undertook trench investigations close to the village of Balaban SarA +/- kaya, on the western part of the Yedisu Segment. We found evidence for at least five surface faulting earthquakes, from which only two are correlated with the 18 July 1784 CE and 27 June 1583 CE historical events. Although the surface rupture of the 1784 CE was reported by other trench studies, the evidence of 1583 CE event is presented for the first time. In consideration with other historical earthquakes, affecting the region east of Erzincan, we suggest that this particular section of the North Anatolian Fault may be in a seismically quiescent period, following a cluster of earthquakes in its near history. In order to test this hypothesis, further studies are needed to increase our knowledge on the temporal and spatial seismic behaviour of the Yedisu Segment, which has potential to create an earthquake with M (w) similar to 7.2 in the near future.
AtıfWoS15OpenAlex23İncele - MakaleYalnız künye2015Scopus SJRQ1Distributed transpressive continental deformation: The Varto Fault Zone, eastern Turkey
Sançar, Taylan; Zabci, Cengiz; Akyüz, H. Serdar; Sunal, Gursel; Villa, Igor M.
AtıfOpenAlex19İncele - MakaleAçık Erişim2015Scopus SJRQ1Spatial slip behavior of large strike-slip fault belts: Implications for the Holocene slip rates of the eastern termination of the North Anatolian Fault, Turkey
Zabci, Cengiz; Sançar, Taylan; Akyüz, H. Serdar; Kiyak, Nafiye Gunec
AtıfOpenAlex18İncele - MakaleYalnız künye2014Kuzey Anadolu Fay Zonu, Ilıpınar Segmenti'nin (Karlıova, Bingöl) Paleosismolojisi
Akyüz, H. Serdar; Sançar, Taylan
Dünyadaki en aktif deformasyon kuşaklarından olan Kuzey Anadolu Fay Zonu (KAFZ) üzerinde son yüzyılda gerçekleşen depremler 1000 kmden fazla yüzey kırığı oluşturmuştur. KAFZnin farklı kesimlerinden elde edilen paleosismik veriler fay zonunun deprem tarihçesi hakkında önemli bilgiler vermiştir. KAFZnin en doğusunda yer alan Ilıpınar Segmentinin son yüzyılda gerçekleşen depremler ile olan ilişkisini ve eski deprem tarihçesini araştırmak amacıyla, Ilıpınar Segmentinin doğu ucunda yer alan Yoncalık havzası üzerinde iki tane paleosismolojik hendek çalışması gerçekleştirilmiştir. Yoncalık-1 hendeğinden elde edilen radyokarbon yaşlandırma sonuçları MÖ 8500-6150 ve MÖ 5960-4300 tarihleri arasında Ilıpınar segmenti üzerinde yüzey kırığı oluşturan iki depremi göstermektedir. Yoncalık-2 hendeğinden elde edilen veriler ise segment üzerinde MÖ 6325 tarihinden önce ve MÖ 6325-2105 tarihleri arasında yüzey kırığı oluşturan depremleri göstermektedir. Bu depremlerin tarih aralıkları geniş olsa da birbirleri ile uyumludur. Yoncalık-2 hendeğinde MÖ 6325 öncesinde olan depremin Yoncalık-1 hendeğinde MÖ 8500-6150 arasında olan deprem ile aynı olduğu düşünülmektedir. Yoncalık-2 hendeğindeki MÖ 6325-2105 tarihleri arasında olmuş depremin ise Yoncalık-1 hendeğindeki MÖ 5960-4300 tarihleri arasında olmuş deprem ile aynı deprem olması yüksek bir olasılık olarak değerlendirilmiştir. KAFZnin en doğu ucunu oluşturan Ilıpınar Segmenti üzerinde yapılan paleosismoloji çalışmalarından edinilen bulgular segmentin deprem üretme davranışının KAFZnin genel karakteri ile uyumlu olmadığını göstermektedir. Bu uyumsuzluğun nedeni Karlıova Üçlü Eklemi civarındaki kompleks fay geometrisi ve buna bağlı olarak biriken yamulmanın bu yapılar tarafından paylaşılması olarak değerlendirilmiştir.
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