Abstract
For Anatolian earthquakes, there are insufficient strong motion data from rock sites to model an attenuation relationship for Turkey. This necessitates the use of records from soil sites, which are significantly affected by amplification. In order to include soil site data in the attenuation analyses, boreholes were drilled at 64 recording stations on soil sites. After removing the effects of soil amplification, rock site and soil site data were combined to establish an attenuation relationship. Various models were tested through regression analyses using moment magnitude, epicentral distance and threshold peak horizontal ground acceleration. A new attenuation relationship is modeled for Turkey.
Résumé
Pour les séismes d’Anatolie, il y a trop peu de données relatives aux mouvements forts enregistrés au rocher pour établir une loi d’atténuation propre à la Turquie. Ceci nécessite l’usage d’enregistrements issus de sites correspondant à des sols sur substratum, affectés de façon significative par une amplification. Afin d’inclure les données issues de ces sites dans les analyses d’atténuation, des forages ont été réalisés sur 64 de ces sites. Après avoir supprimé les effets d’amplification, les données issues des enregistrements au rocher et des sites correspondant à des sols sur substratum ont été combinées pour établir une loi d’atténuation. Différents modèles ont été testés avec des analyses de régression se référant à la magnitude de moment, la distance épicentrale et l’accélération seuil horizontale de pic. Une nouvelle loi d’atténuation a été établie pour la Turquie.
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Acknowledgments
The major funding for this study came from a DPT fund with the project code 2002-K-120130-3. Governmental agencies and Universities provided the strong motion data. The authors are grateful to Professors Aysen Apaydin, Altan Necioglu and Selma Kadioglu of Ankara University for valuable discussions. Geophysicist Ulubey Ceken deserves special thanks for helping to resolve many complications with strong motion data as well as recording stations.
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Kayabali, K., Beyaz, T. Strong motion attenuation relationship for Turkey—a different perspective. Bull Eng Geol Environ 70, 467–481 (2011). https://doi.org/10.1007/s10064-010-0335-6
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DOI: https://doi.org/10.1007/s10064-010-0335-6