Ground motion directionality inferred from a survey of minaret damage during the 1999 Kocaeli and Düzce, Turkey earthquakes |
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| Authors: | Masato Motosaka Adem Somer |
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| Institution: | (1) Disaster Control Research Center, Graduate School of Engineering, Tohoku University, Sendai, Japan;(2) Earthquake Research Department of General Directorate of Disaster Affairs, Ankara, Turkey |
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| Abstract: | Directionality of ground motions has been discussed in near-source groundmotion study. This is interesting from the point of structural response.Dominance of the fault normal (FN) component has been reported inrelation to fault rupture direction based on the observation recordsobtained in the source area (e.g.. Somerville et al., 1996). The authorsperformed the damage survey of the two Turkey earthquakes in 1999, theKocaeli and the Düzce earthquake, and realized that minaret is a goodtarget to investigate the ground motion directionality, because a minaret isa simple cantilever structure without structural directionality. This paperdescribes the ground motion directionality based on the survey of minaretdamages during the two earthquakes in Turkey. From the damage survey,it is found that the fault normal direction was dominant with a certaindistance from the fault, say, less than 1km. While, at the region withshorter distances, the damage direction was not fault normal but about40° from the fault strike. Discussion is addressed for the specificdamage direction inferred from the minaret damage near the fault. |
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| Keywords: | 1999 Dü zce earthquake 1999 Kocaeli earthquake buildingdamage ground motion directionality minaret damage survey slip velocity |
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