Seismic hazard analysis of honaz tunnel environment

Abstract

Honaz Tunnel is located in the southeast of Denizli city center. In the Turkey Earthquake Hazard Map, the maximum acceleration value of the region (PGA 475 years) varies between 0.3-0.9g. When earthquake records are examined, it is seen that Denizli and its surroundings have relatively high seismic activity. In recent years, the occurrence of earthquakes with a magnitude of more than 5 in different areas within a radius of 50km from the city center increases the importance of seismic studies for the region. In this study, in order to examine the Honaz Tunnel environment in terms of geological and seismotectonic, the earthquake-producing faults in the region and the earthquake data that occurred in the instrumental period were obtained and a hazard analysis was carried out with statistical methods. In the calculations made by dividing the magnitude values into eight classes in the range of 4.0-7.5, the return periods of earthquakes of this magnitude were determined. Detailed information about the tunnel floor was obtained by making measurements with the multi-channel surface wave method in the tunnel. The maximum horizontal ground acceleration values that can occur in the tunnel were estimated using attenuation relations. As a result, the frequency of earthquakes that may occur in the region and the magnitude of the acceleration that the tunnel will be exposed to with these earthquakes have been estimated by calculating the recurrence period and seismic risk of earthquakes that may occur around the Honaz Tunnel. It is thought that the data obtained from this study will form an input parameter for future dynamic numerical modeling and will provide preliminary information about the earthquake performance of the tunnel.