- 著者
- 金田 義行 Haluk Ozener Nurcan Ozel Dogan Kalafat Seckin Citak 成実 高橋 高嶺 堀 宗朗 堀 真由美 阪本 Ali Pinar Asim Ozel Ahmet Yalciner Gulum Tanircan Ahmet Demirtas
- 出版者
- 日本地球惑星科学連合
- 雑誌
- 日本地球惑星科学連合2019年大会
- 巻号頁・発行日
- 2019-03-14
Recent, many destructive earthquakes and tsunamis occurred around the plate boundary in the world, which are, 2004 Sumatra Earthquake/Tsunami, 2011 East Japan Earthquake/Tsunami in Japan, and so on. Along plate boundary in Turkey, the North Anatolian Fault (NAF) distributes and the large earthquakes has occurred there. The one of the events along NAF in Turkey is the 1999 Izmit Earthquake, and severe damages was brought to residents The NAF between the eastern end of Turkey and the Aegean Sea has been ruptured in turn from the both ends, and the part off Istanbul city still remains as unruptured zone. It is considered that future large event brings fatal damages not only Istanbul city but also the entire of Turkish economy.To prepare future large earthquake there, Japan and Turkey made an agreement to start a multidisciplinary research project, MarDiM SATREPS in 2003. The Project has four research groups with the following goals. Group 1 is Marmara Earthquake Source region observational research group to clarify seismicity, crustal structures and crustal displacement, and to construct a possible fault model. Group 2 focuses on scenario researches of earthquake occurrence along NAF and precise tsunami simulation in the Marmara region. Group 3 aims improvements and constructions of seismic characterizations and damage predictions based on observation researches and precise simulations. Group 4 promotes disaster educations using research result visuals and construct strategies of disaster mitigation.Group 1 constructed a fault model along NAF with some asperities and with variation on the dip. The segment boundary was also identified through the modeling and it is consistent with the past rupture pattern and fluid distribution. The NAF on the western region of Sea of Marmara has creep and the rate is nearly half of block motion based on direct seafloor observation for crustal displacement. Group 2 calculated cyclic rupture pattern along NAF using heterogeneous fault model and constructed monitoring system “SWIFT” for crustal stress field by mechanisms of many events estimated automatically. We developed tsunami calculation code to image inundation around the coastal area. Group 3 investigated ground structure through regular fine shake observation, and constructed city model of industrial region supporting Turkish economy. We simulated strong motion using ground structure, city model and fault model derived from Group 1 and made a new hazard map. Group 4 considered teaching materials for disaster prevention including Japanese animation technique based on above results of three groups. These materials are utilized for disaster mitigation in Marmara region and disaster education in Turkey.
- 著者
- Michihiro OHORI Seckin CITAK Takeshi NAKAMURA Minoru SAKAUE Shunsuke TAKEMURA Takashi FURUMURA Teito TAKEMOTO Kazuhisa IWAI Atsuki KUBO Kazuo KAWATANI Sawa TAJIMA Narumi TAKAHASHI Yoshiyuki KANEDA
- 出版者
- 公益社団法人 日本地震工学会
- 雑誌
- 日本地震工学会論文集 (ISSN:18846246)
- 巻号頁・発行日
- vol.15, no.3, pp.3_95-3_113, 2015 (Released:2015-06-22)
- 参考文献数
- 34
We have constructed a shallow underground structural model of Kochi City for an area 10.5 km east-west by 5.5 km south-north with a resolution of 125 m, which could control seismic amplification in the short period up to 1 s. By compiling the geological information given by the Committee of Kochi Geo-Hazard Evaluation (2011), we constructed a multilayered model overlying the engineering bedrock with an S-wave velocity of 700 m/s. Based on our newly developed model, the dispersion characteristics of theoretical surface waves at two sites were calculated and verified by comparison with observed data derived from our microtremor array experiments. The predominant periods along two north-south lines calculated from our model were coincident with previous observations derived from microtremor H/V spectral ratios by Mori et al. (2001). We also conducted a seismic response analysis using the synthesized ground motion data from the Central Disaster Management Council of Japan (2003) as the input motion applied to the basement of the developed subsurface structural model. We confirmed that the area where relatively high seismic intensity was predicted corresponded well with the area that was severely damaged during the 1946 Nankai Earthquake.