Earthquake history of the Yatağan Fault (Muğla, SW Turkey): implications for regional seismic hazard assessment and paleoseismology in extensional provinces

Basmenji, Mehran; Akyüz, H. Serdar; Kırkan, Erdem; Aksoy, Murat Ersen; Uçarkuş, Gülsen; Yakupoğlu, Nurettin

doi:10.3906/yer-2006-23

Cited by 8 publications

(11 citation statements)

References 60 publications

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“…Initially, Atalay (1980) mapped the structure as a NEdipping dip-slip fault, subsequently Şaroğlu et al (1987) defined it as the northern part of the right lateral Muğla-Yatağan Fault zone. Eventually, Duman et al (2011) and Emre et al (2013) split the Muğla-Yatağan Fault zone into two individual faults, naming the NE-dipping part of the structure in the northwest as the Yatağan Fault for the first time; furthermore, they define the southeastern extension as the Muğla Fault owing to the change in the dip direction of the hanging wall to the SW (Karabacak, 2016;Basmenji et al, 2020). The fault geometry utilized in this study is compiled and simplified from Basmenji et al (2020).…”

Section: The Yatağan Faultmentioning

confidence: 99%

“…Eventually, Duman et al (2011) and Emre et al (2013) split the Muğla-Yatağan Fault zone into two individual faults, naming the NE-dipping part of the structure in the northwest as the Yatağan Fault for the first time; furthermore, they define the southeastern extension as the Muğla Fault owing to the change in the dip direction of the hanging wall to the SW (Karabacak, 2016;Basmenji et al, 2020). The fault geometry utilized in this study is compiled and simplified from Basmenji et al (2020). Additionally, although the fault geometry utilized in the aforementioned study indicates a similar geometry to Emre et al (2013) and Karabacak (2016)'s studies, it demonstrates different orientation especially along northern and southern ends (review Basmenji et al, 2020 for more details).…”

Section: The Yatağan Faultmentioning

confidence: 99%

“…Structural analyses undertaken along the fault scarps and slickensides during the field investigations indicate the dominant normal sense of motion with the minor right-lateral strikeslip component as a result of NNE-SSW oriented extensional forces (Gürer et al, 2013;Basmenji at al., 2020). The fault trends for ~30 km between densely populated Yatağan and Muğla cities (Figure 2).…”

Section: The Yatağan Faultmentioning

confidence: 99%

“…The lineations were also studied during field campaigns and mapped based on McCalpin (2009) and McClay ( 2013) criteria (e.g. direct observation of marble fault planes and stratigraphic separation along the fault; Basmenji et al, 2020).…”

Section: The Yatağan Faultmentioning

confidence: 99%

“…In addition, a dense population and growing civilization on and around this seismogenic zone are increasingly at risk from potential seismic activity along the Yatağan Fault. Paleoseismic investigations on the fault clearly indicate that the Yatağan Fault has been active during the Holocene period and has potential to generate surface rupturing earthquakes (Basmenji et al, 2020). Therefore, a critical step towards an improved understanding the seismic hazard of the Yatağan Fault is to study the tectonic geomorphology in order to determine the vertical slip rates and the pattern of associated tectonic deformation.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic geomorphology of the Yatağan Fault (Muğla, SW Turkey): implications for quantifying vertical slip rates along active normal faults

Basmenji¹,

Sançar²,

Dikbaş³

et al. 2021

Turkish J Earth Sci

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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 ( ) plots, and log-log slope 2 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/yr and 0.3 ± 0.05 mm/yr 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/yr and 0.36 mm/yr 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/yr. 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.

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Section: The Yatağan Faultmentioning

confidence: 99%

Section: The Yatağan Faultmentioning

confidence: 99%

Section: The Yatağan Faultmentioning

confidence: 99%

Section: The Yatağan Faultmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tectonic geomorphology of the Yatağan Fault (Muğla, SW Turkey): implications for quantifying vertical slip rates along active normal faults

Basmenji¹,

Sançar²,

Dikbaş³

et al. 2021

Turkish J Earth Sci

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Earthquake history of the Milas Fault: an active dextral fault in an extensional province (SW Anatolia, Türkiye)

et al. 2023

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Palaeoseismological assessment for a seismic gap located very close to the epicentre of the 30 October 2020 Samos Earthquake (M6.9), western Anatolia, Turkey

Öncü,

Sözbilir,

Özkaymak

et al. 2024

Nat Hazards

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The Tuzla Fault (TF), considered one of the most important seismic sources in İzmir province, is defined as a strike–slip fault with N10E–N60E striking between Gaziemir and Doğanbey districts. A 50-km-long fault consists of three segments which are, from north to south Çatalca, Orhanlı, and Doğanbey segments. Recent studies claim that the part of the TF extending to Kuşadası Bay is also in a kinematic relationship with the Samos Fault that caused an earthquake on 30 October 2020 (Mw = 6.9). In this study, in order to analyse the historical behaviour of the fault, three trench-based palaeoseismology studies across the fault scarp were conducted on three geometric segments of the TF. Palaeoseismology findings show that seven historic/prehistoric earthquakes were generated by TF. According to Oxcal distribution using the Bayesian methods, the time of the events lie between 46.2 ± 6.1 and 1.6 ± 0.3 ka. When the events are compared with the historical earthquakes, the last event is correlated with the earthquakes of 47 AD and/or 177/178 AD on the Doğanbey segment. Moreover, the other events can be attributed to the late Pleistocene–Holocene earthquakes that are prehistorical periods. Our results provide a recurrence interval of an earthquake along the TF to between 0.7 and 4.3 ka for the Holocene period. The elapsed time since the most recent surface faulting earthquake on the TF is 1844 years. It is suggested that it is predicted that TF has the potential to produce destructive earthquakes in the near future, especially in Orhanlı and Çatalca segments which may be considered as a seismic gap.

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Earthquake history of the Yatağan Fault (Muğla, SW Turkey): implications for regional seismic hazard assessment and paleoseismology in extensional provinces

Cited by 8 publications

References 60 publications

Tectonic geomorphology of the Yatağan Fault (Muğla, SW Turkey): implications for quantifying vertical slip rates along active normal faults

Tectonic geomorphology of the Yatağan Fault (Muğla, SW Turkey): implications for quantifying vertical slip rates along active normal faults

Earthquake history of the Milas Fault: an active dextral fault in an extensional province (SW Anatolia, Türkiye)

Palaeoseismological assessment for a seismic gap located very close to the epicentre of the 30 October 2020 Samos Earthquake (M6.9), western Anatolia, Turkey

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