Soil Liquefaction Hazard Assessment of Dalaman Residential Area

Abstract

The Phenomenon of Liquefaction gained importance after the 1964 Alaska and Niigata Earthquakes, and it has started to be studied worldwide. Türkiye, located in a very tectonically active zone, has been exposed to many devastating earthquakes. Dalaman is located in SW Anatolia which is under the control of active extensional tectonic regime that may generate such devastating earthquakes in the future. Moreover, because the Dalaman residential area is located on sedimentary deposits, determination of the liquefaction susceptibilities of the soils in the region is an important task to take essential precautions. Analyses have been performed according to two earthquake scenarios with magnitudes Mw=5.5 and Mw=7.5. Standard Penetration Test blow number-based simplified procedure has been used in the analyses and it has been seen that Dalaman residential area is highly susceptible to liquefaction. Most of the liquefiable soils are sands and they make the central part of the area. The northern part of the basin is formed of gravels and safer compared to the southern part, which is formed mostly of sands, silts and clays. Considering the population of the residential area approximately 40.000 people are under danger in case of a M=7.5 earthquake scenario.