Ground Motion Characterization for Vertical Ground Motions in Turkey—Part 2: Vertical Ground Motion Models and the Final Logic Tree
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The main objectives of this study are: (1) to choose the vertical ground motion models (GMMs) that are consistent with the magnitude, distance, depth, and site amplification scaling of the updated Turkish ground motion database, and (2) to combine the vertical GMMs with the V/H ratio models selected in the accompanying paper (Alipour et al. in Pure Appl Geophys 1–22, 2019) to provide the ground motion characterization logic tree for the vertical ground motion component in Turkey. Four global vertical GMMs [proposed by Bozorgnia and Campbell in Earthq Spectra 32(2):979–1004, 2016b; Stewart et al. in Earthq Spectra 32(2):1005–1031, 2016; Gülerce et al. in Earthq Spectra 33(2):499–528, 2017 using the NGA-West 2 database; and Çagnan et al. in Bull Earthq Eng 15(7):2617–2643, 2017 model based on the RESORCE database] are selected, and the model predictions are compared with the actual data in the updated Turkish ground motion dataset using the analysis of the residuals. Analysis results showed that the magnitude scaling of Çagnan et al. (2017) model and the depth scaling of the Bozorgnia and Campbell (2016b) model are inconsistent with the Turkish strong motion database. Additionally, small-magnitude (SM) scaling of Stewart et al. (2016) and Gülerce et al. (2017) GMMs should be modified for a better fit with the Turkish dataset. Trellis plots of SM-modified Stewart et al. (2016) and SM-modified Gülerce et al. (2017) vertical GMMs and selected V/H ratio models multiplied with NGA-West 2 and Turkey (TR)-adjusted horizontal NGA-West 1 models [Gülerce et al. in Earthq Spectra 32(1):75–100, 2016] are used to determine the logic tree weights for the proposed vertical ground motion characterization logic tree for Turkey.
KeywordsTurkish strong motion database vertical ground motion models analysis of residuals regional small-magnitude correction ground motion logic tree
This manuscript was prepared based on the graduate thesis of N. A. Alipour in the Earthquake Studies Department of Middle East Technical University. Review and suggestions of the thesis defense committee members are highly appreciated. We are grateful for the efforts of editors and guest editors of the special issue, especially Dr. Luis Dalguer and Dr. Philippe Renault. The authors are thankful to Shahram Pezeshk and Emel Seyhan for their insightful comments.
- Alipour, N. A., Sandıkkaya, M. A., & Gülerce, Z. (2019). Ground motion characterization for vertical ground motions in Turkey—Part 1: V/H ratio ground motion models. Pure and Applied Geophysics. https://doi.org/10.1007/s00024-019-02324-y.
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