Asst. Prof. Fırat Kıpçak

This study note evaluates the structure of the Earth, the mechanisms of earthquakes, the tectonic structure of Turkey, the science of seismology, earthquake parameters, and their effects. The objective of this study is to understand the mechanisms of earthquakes, learn about the earthquakes experienced in our country, and enhance the scientific knowledge base regarding earthquakes. In this regard, the note first defines an earthquake, then explains seismic waves, epicenter and magnitude. Next, it describes the tectonic processes involved in the formation of earthquakes. Earthquakes occurring in our country, earthquake types and mechanisms, fault lines and fault characteristics are examined under separate headings. The concept of earthquakes was addressed from multiple perspectives, and its relationship with fault systems was examined comprehensively. The differences between the concepts of magnitude and intensity of earthquakes were explained, and the characteristics of earthquake wave types and ground motion were specified. This study presented concepts related to the occurrence of earthquakes in a systematic manner. A framework was provided that can be utilised in the fields of engineering and earth sciences. 

This study note covers the history of tunnelling, tunnelling methods, construction stages and their regulations. The TBM method, which is widely used in Turkey, and the NATM (New Austrian Tunnel Boring Machine) method were discussed, and their construction regulations and details were evaluated. In Turkey, more road tunnels are being constructed than rail tunnels, and the cross-section characteristics and tunnel excavation methods used for this purpose are also changing. In tunnel construction methods, TBM machines, also known as mole machines, are used more often in areas with solid ground, while the NATM method is used in weak ground. The study note provides details of the Kuskunkıran Tunnel between Van and Tatvan (Bitlis), which serves as an example of the NATM method. This heavily used road has a lateral width of approximately 20 metres and a length of 170 kilometres. In addition, there is a 2,234-kilometre-long Kuskuskunkıran pass on this road. Increased traffic congestion caused disruptions at the crossing. Furthermore, the existing road required constant maintenance work due to the region's climatic conditions. A tunnel was constructed by the highways authority to eliminate these disruptions and improve the road. The Kuskunkıran Tunnel built over the crossing resolved these issues. An alternative route was opened to the old 9+500 km route at an altitude of 2234 m, creating a high-standard road 3+612 km in length. With the opening of this tunnel, the Kuskunkıran Pass was shortened by approximately 6+000 km, and the average travel time was reduced from 30 minutes to 5 minutes.