Investigation of local soil properties of Erzurum province (Eastern Türkiye) by Horizontal/Vertical Spectral Ratio method

Authors : Şeyma Sarigül, Erdem Bayrak
Pages : 42-51
Doi:10.19111/bulletinofmre.1574914
View : 46 | Download : 159
Publication Date : 2025-08-15
Article Type : Research Paper
Abstract :Erzurum province is a basin developed under the effect of strike-slip faults in the Eastern Anatolia region. The province is generally influenced by the left strike-slip Erzurum Fault Zone, the leftstrike- slip Aşkale fault, and the Başköy-Kandilli reverse fault. It is also located approximately 80 km from the Karlıova joint, which is the intersection of the North Anatolian and East Anatolian Faults. When the earthquakes of the instrumental and historical periods are analyzed, it is seen that many damaging earthquakes of medium to large magnitude have occurred in the Erzurum province. The Erzurum Basin is generally covered with old alluvium at the edges of the plains, while the flat areas in the central parts are covered with new alluvium. Determination of local soil properties in regions with high seismic hazard plays an important role in reducing earthquake risk. For this purpose, single station microtremor measurements were applied at 25 sites in Palandöken and Yakutiye districts of Erzurum province. The measurements were taken for at least 30 minutes and evaluated by using the Horizontal (H)/ Vertical (V) Spektral Ratio (HVSR) method. As a result of the analysis, the dominant period, H/V ratio and vulnerability index (Kg) values of the measurement points were calculated. The period values obtained vary between 0.15 s and 3.7 s, while the H/V ratios are between 2.2 and 8.5. The Kg value obtained using these parameters is defined as the vulnerability of the soil. It is concluded that high period, high H/V and high Kg values are obtained in areas with recent alluvium and multidisciplinary analyses should be performed in soil investigations in these regions.
Keywords : Erzurum, the Horizontal/ Vertical Spectral Ratio, Dominant Period, Vulnerability Index.

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