| Project/Area Number |
12574019
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Natural disaster science
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
SAWADA Sumio Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (70187293)
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| Co-Investigator(Kenkyū-buntansha) |
KIYONO Jyunji Kyoto University, Civil Eng.Systems, Associate Professor, 大学院・工学研究科, 助教授 (00161597)
MORIKAWA Hitoshi Tokyo Instituted Technology, Dept.of Civil Eng., Associate Professor, 総合理工学研究科, 助教授 (60273463)
AKAMATSU Jyunpei Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (10027279)
HONDA Riki Kyoto University, Disaster Prevention Research Institute, Research Associate, 防災研究所, 助手 (60301248)
MIMURA Mamoru Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (00166109)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2001: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2000: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | 1999 Kocaeli Earthquake / Adapazari / refraction survey / gravity anomaly / microseism observation / boring survey / PS logging / seismic wave propagation / 1999コジャエリ地震 / サカリヤ / 重力異動 / フォーカッシング |
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| Research Abstract |
The bedrock structure of the basin of Adapazari was studied on the basis of Bouguer gravity anomaly, SPAC and H/V analyses of microseisms, and seismic refraction survey. The main results are as follows :
(1)the bedrock subsides stepwise at the edge of depressions ;
(2)the basin consists of three narrow depressions of the basement of E-W or NE-SW trending. The depth to bedrock reaches 1000-1500 m ;
(3)3D model of deep ground structure of Adapazari basin based on the results of gravity survey, SPAC and H/V analyses of microseisms, and seismic refraction surveys ;
(4)simulation of Kocaeli earthquake was performed using Finite Difference method based on the 3D model. The results show that strong motions, which brought severe damage to the town, is considered to have been produced by amplification due to the specific configuration of bedrock, that is, focusing and/or so-called basin-edge effect.
It is pointed out that investigation of 3D bedrock configuration is an urgent issue for microzoning an urban area on a sedimentary basin, and for this, comparative analysis of gravity, microseisms and efraction wave is highly prospective, because we can obtain more reliable structural models using different kinds of physical parameters: seismic impedance and density distribution.
The surveys of shallow soil profile at the down town was also performed. The results are as follows ;
(1)any soil layer of loose sand was not found. This fact shows that typical liquefaction was not considered to occur during the mainshock ;
(2)thickness of very soft soil layers, at which probe of Swedish sounding sink by its own weight, varies in the town. It is considered to affect the difference of damage of building between inertia type damage and settlement type damage.
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