An evaluation of the 2019 seismic hazard map of Turkey on the basis of spectrum intensity

2019-10-11
Akansel, Vesile Hatun
Soysal, Berat Feyza
Kadaş, Koray
Gülkan, Hakkı Polat
Seismic hazard maps show the distribution of expected earthquake shaking levels that have a specific probability of occurrence for a region, and provide input for engineers to design structures that will withstand earthquake ground shaking. The 2019 Turkish Building Earthquake Regulation relies on an updated seismic hazard map that considers new source models and more recent ground motion prediction equations. The effect of the change in seismic hazard map that will directly affect the code-based seismic demand calculations and that will have a subsequent effect on design of all structural systems is a crucial question that has engaged the interest of engineers who use the new seismic requirements. This study examines the difference between the newly introduced seismic hazard map of Turkey and its predecessor using an intensity-based metric. For this purpose, we used the 475-year peak ground acceleration (PGA) values for the roughly four-thousand regularly spaced grid locations covering Turkey. Provisions of the previous Regulation use the PGA and the soil class as parameters to derive the design spectrum. Using the elastic spectrum curves, it becomes possible to calculate for each grid point the Acceleration Spectrum Intensity, defined as the area under the curve between periods ranging from 0.1-2.5 s. These values are robust indicators for the targeted capacity of the building stock. Next, we followed the same steps at the same geographic locations for the same return period for the 2019 Seismic Hazard Map of Turkey to obtain the spectrum intensity values implied by the new map. There exists a strong similarity between the definitions of soil types, but the amplifications are dependent on the soil type and spectral acceleration. The contours that display the ratio of the current and earlier spectral intensity (SI) is the country-wide distribution of how hazard has been assumed to have changed among the two maps. It is possible to quantify the economic implications of the updated map and its safety dimension.
Fifth International Conference on Earthquake Engineering and Seismology , 5ICEES (2019)

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Citation Formats
V. H. Akansel, B. F. Soysal, K. Kadaş, and H. P. Gülkan, “An evaluation of the 2019 seismic hazard map of Turkey on the basis of spectrum intensity,” presented at the Fifth International Conference on Earthquake Engineering and Seismology , 5ICEES (2019), Ankara, Türkiye, 2019, Accessed: 00, 2021. [Online]. Available: http://www.5icees.com/programme/.