2024 Volume 10 Issue 24 Pages 908-913
Turkey witnessed thousands of aftershocks following the Turkey-Syria Earthquake (EQ) of 2023. Concerning the same, the Hatay province of southern Turkey also experienced an aftershock of 6.4 (Mw) with epicenter near Samandag District. As per United States Geological Survey (USGS), Samandag has been exposed to numerous minor to strong earthquakes since 1981. Performing a ground response analysis on the aforementioned geographic area would help in understanding the behavior of in-situ soil, in response to the ground motions recorded, as attempted in this work. For the purpose 67 EQ records (recorded between December, 2013 and April, 2023) from No. 3140 recording station are used in Horizontal-to-Vertical Spectral Ratio (HVSR) method to determine average HVSR curve and subsequently the predominant frequency (fpeak) for the station. Using this value of fpeak and regionally available correlations, value of average 30m shear wave velocity (Vs30) of the recording station, is determined. Obtained Vs30 is found comparable with existing studies for the above recording station. Further, the approximate depth of bedrock (Db) for the region is estimated using regional correlations between fpeak and Db. Till Db, the soil types are approximated using Latin Hypercube Sampling (LHS) and other engineering properties of soil are estimated using appropriate empirical equations. Using the predetermined value of Db, soil properties and surface ground motions recorded at 3140, bedrock motions are estimated based on deconvolution. Considering estimated bedrock motion and surface recorded motion, amplification factor for each of the 67 ground motion records are determined and variation in amplification factor with PHA is obtained for the region. Such understanding will be helpful in arriving at surface seismic hazard for a target/ probable bedrock seismic hazard value for the region, which can further be used in EQ resistant design and quantification of EQ induced damages for the region.
