Deformation in SW Anatolia (Turkey) Documented by Anisotropy of Magnetic Susceptibility Data

Özkaptan, Murat; Gülyüz, Erhan; Uzel, Bora; Langereis, C.G.; Özacar, A. Arda; Kaymakçı, Nuretdin

doi:10.1029/2021tc006882

Cited by 4 publications

References 81 publications

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Modeling of kappa factor using multivariate adaptive regression splines: application to the western Türkiye ground motion dataset

Kurtulmuş,

Yerlikaya–Özkurt,

Askan

2024

Nat Hazards

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The recent seismic activity on Türkiye’s west coast, especially in the Aegean Sea region, shows that this region requires further attention. The region has significant seismic hazards because of its location in an active tectonic regime of North–South extension with multiple basin structures on soft soil deposits. Recently, despite being 70 km from the earthquake source, the Samos event (with a moment magnitude of 7.0 on October 30, 2020) caused significant localized damage and collapse in the Izmir city center due to a combination of basin effects and structural susceptibility. Despite this activity, research on site characterization and site response modeling, such as local velocity models and kappa estimates, remains sparse in this region. Kappa values display regional characteristics, necessitating the use of local kappa estimations from previous earthquake data in region–specific applications. Kappa estimates are multivariate and incorporate several characteristics such as magnitude and distance. In this study, we assess and predict the trend in mean kappa values using three–component strong–ground motion data from accelerometer sites with known VS30 values throughout western Türkiye. Multiple linear regression (MLR) and multivariate adaptive regression splines (MARS) were used to build the prediction models. The effects of epicentral distance Repi, magnitude Mw, and site class (VS30) were investigated, and the contributions of each parameter were examined using a large dataset containing recent seismic activity. The models were evaluated using well–known statistical accuracy criteria for kappa assessment. In all performance measures, the MARS model outperforms the MLR model across the selected sites.

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Modeling of kappa factor using multivariate adaptive regression splines: application to the western Türkiye ground motion dataset

Kurtulmuş,

Yerlikaya–Özkurt,

Askan

2024

Nat Hazards

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Morphotectonic development of surface karst in Western Taurus (Türkiye)

Şener,

Şimşek,

Utlu

et al. 2023

Carbonates Evaporites

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The Taurus Mountains include the most important karstic terrain of Turkey and are divided into three parts the Western, Central, and Eastern Taurus. These mountains include many surface and subsurface karst landforms and the morphometric features of these landforms provide important data on the geomorphological and morphotectonic development of karst areas in the Taurus Mountains. Karstic depressions (poljes and dolines) constitute the most important surface landforms in the Western Taurus Mountains. In this study, a total of 7093 micro depressions (doline) and 74 macro depressions (polje) were detected and morphometric properties were calculated located in the Western Taurus Mountains. The poljes developed within the Beydağları Autochthon and Lycian nappes, while the dolines developed especially in the high plateaus within the Beydağları Autochthon. The morphotectonic development of both landforms is as below shortly. As a result of the northward movement of the African plate from the Early Cretaceous to the Late Miocene, the limestones accumulated in the shallow marine environment were compressed in the north direction and made a counterclockwise movement. Depending on this tectonic activity, the Lycian Nappes from the northwest and the Antalya Nappes from the east thrust over the Baydağları autochthon, and thus nappes, reverse faults and fold systems developed in the study area. The Western Taurus began to continentalization from the Oligocene and began to erode from the Miocene, and also with the erosion, the valley systems began to develop in the Western Taurus. The NE-SW and NW-SE directional normal faults have developed under the in uence of extensional tectonics since the Miocene, and this extensional tectonism has caused widespread development of the poljes in the study area. In addition, dolines and paleovalley began to develop in limestone areas at higher elevations with the lowering of the karst base level. All morphometric and morphotectonic processes reveal that the extension of both doline and polje areas in the study area are parallel to the elongation of tectonic structures in the study area.

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A new example of polyphase basin formation in western Anatolia: Plio-Quaternary Tavşanlı Graben, Kütahya

Özburan

2024

International Geology Review

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Deformation in SW Anatolia (Turkey) Documented by Anisotropy of Magnetic Susceptibility Data

Cited by 4 publications

References 81 publications

Modeling of kappa factor using multivariate adaptive regression splines: application to the western Türkiye ground motion dataset

Modeling of kappa factor using multivariate adaptive regression splines: application to the western Türkiye ground motion dataset

Morphotectonic development of surface karst in Western Taurus (Türkiye)

A new example of polyphase basin formation in western Anatolia: Plio-Quaternary Tavşanlı Graben, Kütahya

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