This chapter summarizes the effect of East Anatolian Fault and North Anatolian Fault zones on the performance of TBMs in the Nurdağı high-speed railway tunnel, Doğançay, and Kargı hydropower tunnels. The Nurdağı tunnel is in the active zone of the East Anatolian Fault, one of Turkey’s most seismically active zones because it represents a plate boundary extending over 500 km between the Arabian and Anatolian plates. An Earthquake of 7.8 Mw occurred in this area on February 6th, 2023, affecting 16 million people living in this area. The town of Nurdağı is destroyed during this event. However, in the Nurdağı Tunnel, only some of the rings between the chainage 11 + 696 and 13 + 143 km are affected. This part of the tunnel was evaluated as risky for TBM at the beginning of the project. The other part of the tunnel stayed in a good state, and the performance of the TBM was as predicted from the laboratory cutting experiments. Doğançay tunnel is located in the north-east of Turkey, affected by the East Anatolian Fault, and it is a part of a hydroelectric project. During the boring of the tunnel, TBM was trapped 10 times, and around 160 days were spent on rescue operations. It is concluded that the main reason for the squeezing of the tunnel was high overburden reaching 1000 m and tectonic stresses exerted by the complex East Anatolian Fault. The tunnel is around 30–35 km from the fault zone that runs and moves to the West at a rate of 2.5 to 10 mm/year. Kargı hydropower tunnel is located within the Northern Anatolian Fault Zone, primarily responsible for most earthquakes in Turkey. Between March 1st, 1990, and March 1st, 2025, 7261 earthquakes of magnitudes on the Richter scale up to 5.8 occurred within 100 km of Kargı. Nine earthquakes were above magnitude 5, and 68 were between magnitude 4 and 5. Within 2000 km of the tunnel route, a 9.84 m diameter TBM jammed 7 times, necessitating 285 days for rescue operations. The behavior of the tree-bored tunnels after the big earthquakes is also reported in this chapter.