Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14720/4

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Browsing Scopus İndeksli Yayınlar Koleksiyonu by Institution Author "Akkaya, Ismail"

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    Article
    The Application of Hvsr Microtremor Survey Method in Yuksekova (Hakkari) Region, Eastern Turkey
    (Pergamon-elsevier Science Ltd, 2015) Akkaya, Ismail
    The horizontal to vertical spectral ratios of microtremor (HVSR) analysis of Yuksekova and its surroundings is carried out using the results of field investigations, local soil conditions and seismotectonic features of the region. Soil-structure interaction is one of the most important reason for building damage ratio. The effects of soil conditions on probably damaged building units were determined, by conducting HVSR microtremor measurements. In this study data collection is handled during 30 min using three component seismograph measurements at 40 points in the Yuksekova region. HVSR peak period map shows that the fundamental period range between 0.4 and 1.6 s in the soft sediments units. Rock sites of the northern coast of Yuksekova period range between 0.1 and 0.2s. HVSR peak amplitude values are in the interval 1.5-6.0. (C) 2015 Elsevier Ltd. All rights reserved.
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    Article
    Availability of Seismic Vulnerability Index (Kg) in the Assessment of Building Damage in Van, Eastern Turkey
    (Springer, 2020) Akkaya, Ismail
    The seismic vulnerability index (K-g) is a parameter that depends on the dynamic properties of soil. With this parameter, it is possible to evaluate the vulnerability of a point-based site under strong ground motion. Since it is related to the natural vibration period and amplification factor, the parameter can be calculated for both soil and structure. In this study, HVSR microtremor measurements are recorded at more than 200 points in the Van region to generate a seismic vulnerability index map. After generating the map, it is determined that the hazard potential and seismic vulnerability index is high at the sites close to Van Lake and at the densely populated city center. Damage information of the buildings investigated after the 2011 Van earthquakes (M-w = 7.1) are placed on the seismic vulnerability index map and it is realized that there may be a correlation between the damage and the seismic vulnerability index. There is a high correlation, approximately 80 percent, between the damage rate map based on the damaged building data and the K-g values. In addition, vulnerability indexes of buildings are calculated and the eff ect of local soil conditions and building properties on the damage levels are determined. From the results of this study and the site observations after the 2011 Van earthquakes, it is found that structural damage is not only structure-dependent but is also related to the dynamic behavior of soil layers and local soil conditions.
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    Article
    Investigation of Site Effect of Lake Van Region (Eastern Turkey) by Using Strong Ground Motion Records
    (Elsevier, 2023) Akkaya, Ismail
    The site effect plays a very important role in determining the structural damage that may occur in a possible major earthquake. In this study, seventy-nine strong ground-motion records (M > 4.5) from past earthquake events in the Lake Van region, recorded by 14 accelerometer stations located on dissimilar geological units, were analyzed for local soil properties using horizontal-to-vertical spectral ratio (EHVSR) method. In addition, EHVSR results were compared with Standard Spectral Ratio (SSR) results, which is another method used to determine soil amplification. The obtained predominant period, amplification factor, seismic vulnerability index (Kg) and bedrock depth values were examined. The EHVSR results show that the predominant frequencies of the sites and the amplification factor values were estimated as 0.58-5.77 Hz and 1.84-7.5, respectively. The seismic vulnerability index (Kg) values, which are crucial parameter in hazard assessment, change from 1.6 to 30. The bedrock depths range between 11 and 186 m for the study area. From the results of this study it is found that the damage may be high after a possible destructive earthquake in the study area where the predominant period, amplification, Kg values and bedrock depth are high.