6 Şubat 2023 Depremleri Tarafından İslahiye–Fevzipaşa Çevresinde Tetiklenen Kaya Düşmelerinin Yüksek Çözünürlüklü Ortofotolar Kullanılarak Değerlendirilmesi

Abstract

On February 6, 2023, two large earthquakes with magnitudes of 7.7 and 7.6 occurred approximately 9 hours apart. During these earthquakes, numerous rockfalls were triggered, particularly in mountainous regions; these rockfalls caused significant damage and loss of life in both transportation routes and residential areas. One area where rockfalls were particularly intense is the mountainous region surrounding the İslâhiye and Fevzipaşa of Gaziantep province. Rockfalls in this region led to the complete closure of the railway route. This thesis aims to create an inventory of rockfalls triggered by the February 6, 2023 Kahramanmaraş earthquakes in a region between İslâhiye and Fevzipaşa within the Gaziantep province and to apply rockfall analyses. Understanding the mechanisms of slope movements and evaluating the potential future hazards requires detailed inventory studies. However, creating an inventory of rockfalls solely through field studies is often not possible. Since rock blocks falling onto transportation routes are quickly cleared, determining the final stopping points of falling rock blocks becomes difficult. Following the earthquake, high-resolution orthophotos of the earthquake zone were produced as a result of flights conducted in the region by the General Directorate of Mapping. These high-resolution orthophotos provide an effective data source for determining the locations, sizes, and effects of rockfalls. Therefore, within the scope of this study, data was collected using high-resolution orthophotos such as satellite images, aerial photographs, and special shots, the spatial distribution of rockfalls triggered by earthquakes in the study area was determined, and a detailed inventory of the effects of these events was created, and analyses of rock blocks whose locations are known were performed. The inventory prepared will constitute an important data source and foundation for detailed analyses to be applied in the future.