1997 Fiscal Year Final Research Report Summary
Inland Earthquakes : Tectonics and Hazard Implication
| Project/Area Number |
07680485
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | Gifu University |
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Principal Investigator |
YAIRI Kenji Gifu University, Faculty of Engineering, Professor, 工学部, 教授 (20022650)
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| Co-Investigator(Kenkyū-buntansha) |
KOJIMA Satoru Gifu University, Faculty of Engineering, Professor, 工学部, 教授 (20170243)
KANAORI Yuji Yamaguchi University, Faculty of Science, Professor, 理学部, 教授 (60194883)
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| Project Period (FY) |
1995 – 1997
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| Keywords | ACTIVE FAULT / EARTHQUAKES / HAZAAD / INLAND EARTHQUAKES / REGIONAL TECTONICS / STRUCTURAL GEOLOGY / CENTRAL JAPAN |
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| Research Abstract |
Based on a block structure model of central Japan, an examination was conducted of the space-time distribution patterns of destructive earthquakes. The distribution patterns revealed a periodicity in earthquake activity and the existence of seismic gaps.
A one-dimensional Stick-slip model, which is introduced to explain the fractal features of earthquake phenomena is applied to describe the destructive earthquake occurrences in central and south-west Japan. Space time patterns of events are simulated and the predictability is discussed. On the basis of the block-rotation model, epicenters of historical destructive earthquakes with magnitude 6.4 ro greater are relocated to the tectonic or block boundary lines. This model has revealed that these events show a periodicity of about 1000 years of active and quiet alternative intervals. In each active period, individual block boundary lines gene[rate several large earthqukes without overlapping rupture areas. The space-time pattern and moment release rate ofr the Hanaore-Kongo Fault Line can be represented well with the one-dimensional stick-slip model. The seismic coupling of large offshore earthquakes along the Nankai trough is also found to be well modeled by this model. This model may be useful for estimation of seismic risk in this region. Further, this model can be applied to see the situation of the M7.2 Kobe earthquake and interpret this earthquake to be the event that comes from the block structure in later section.
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