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

Kırkan, Erdem; Akyüz, H. Serdar; Basmenji, Mehran; Dikbaş, Aynur; Zabcı, Cengiz; Yazıcı, Müge; Erturaç, M. Korhan

doi:10.1007/s11069-022-05733-w

Cited by 4 publications

(1 citation statement)

References 56 publications

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“…GNSS investigations point to a north-south regional extension in western Türkiye, which is termed the Western Anatolian Extensional Province (WAEP). This extension is occurring at a rate of roughly 30-40 mm per year [46][47][48].…”

Section: Geology Tectonics and Seismicity Of Sw Türkiyementioning

confidence: 99%

Comparison of Performance Analysis Results with Developed Site-Specific Response Spectra and Turkish Seismic Design Code: A Case Study from the SW Türkiye Region

Alpyürür,

Ulutaş

2024

Buildings

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On 6 February 2023, the Kahramanmaraş earthquakes clearly showed that the elastic spectrum curves in TBEC-2018 are insufficient to represent earthquake behavior. In this study, the effect of using a site-specific spectrum curve instead of the elastic spectrum given in TBEC-2018 on the earthquake safety of a building is investigated. For this purpose, the provinces in southwest Anatolia, Türkiye, which is one of the most tectonically complex regions with frequent seismic events, were selected. In the first stage of the study, spectrum curves were obtained for earthquakes with return periods of 2475, 475, and 72 years for each of the provinces in this region. These spectrum curves were obtained using probabilistic seismic hazard studies that take into account the active faults of the provinces and earthquake activity in both historical and instrumental periods. In the second stage of the study, analytical models of a selected model RC building were created according to each province, and static pushover analyses of these building models were performed both according to the elastic spectrum given in TBEC-2018 and according to the spectrum curve created specifically for the province. The results of the analyses show that the change in the spectrum changes the target displacement level of the buildings, and as a result, the cross-sectional damage zone of the structural elements under the earthquake effect is changed. So much so that using the site-specific instead of the elastic spectrum given in TBEC-2018 changed the damage zone of 43% of the beams and 26.4% of the columns in the İzmir model. The change in the section damage zones changed the performance level of some floors of the models and the performance level of the building. The study revealed the importance of using the most realistic elastic spectrum curves in order to determine the earthquake performance of buildings that is as close as possible to their behavior in a possible earthquake.

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Section: Geology Tectonics and Seismicity Of Sw Türkiyementioning

confidence: 99%

Comparison of Performance Analysis Results with Developed Site-Specific Response Spectra and Turkish Seismic Design Code: A Case Study from the SW Türkiye Region

Alpyürür,

Ulutaş

2024

Buildings

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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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Determination of the relationship between tectonic and karstification using morphometric indices in Bozburun Peninsula, Marmaris, Türkiye

2023

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Bozburun Peninsula (Marmaris) attracts attention because it contains various karstic shapes on limestones belonging to different periods and it is also an important area in terms of tectonic activity. This study examines the area sizes of the karstic shapes determined by satellite images, topographic maps and field studies, the elevations, slopes, depth value ranges and extensions where they are clustered and the fault lines affecting them have been determined. In order to explain this effect quantitatively, the elongation ratio (RE) and elongation direction (EA α) from morphometric shape indices were used. Poljes, on the other hand, were evaluated in more detail separately from dolines and uvalas, the pitting rates (PR) was calculated. It was understood that in this study which Remote Sensing (RS), Geographic Information System (GIS) technologies and field observations were correlated, folds and fractures that occurred in the Western Taurus Karst Region during the paleotectonic and neotectonic periods had a positive effect on karstification, and it was determined the lie of the karstic shapes to a great extent resemblance to the lie of the faults.

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

Cited by 4 publications

References 56 publications

Comparison of Performance Analysis Results with Developed Site-Specific Response Spectra and Turkish Seismic Design Code: A Case Study from the SW Türkiye Region

Comparison of Performance Analysis Results with Developed Site-Specific Response Spectra and Turkish Seismic Design Code: A Case Study from the SW Türkiye Region

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

Determination of the relationship between tectonic and karstification using morphometric indices in Bozburun Peninsula, Marmaris, Türkiye

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