| Project/Area Number |
16540350
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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 |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Nihon University |
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Principal Investigator |
SUZUKI Norikazu Nihon University, College of Science and Technology, Associate Professor, 理工学部, 助教授 (60246824)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Sumiyoshi University of Tsukuba, Graduate School of Pure and Applied Sciences, Associate Professor, 数理物質科学研究科, 助教授 (70184215)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Earthquakes / Complex System / Complex Network / Statistical Mechanics / Time Series Analysis / Scale Invariance / Small World / Hierarchical Structure / 自然時間 |
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| Research Abstract |
We have constructed the complex growing networks from the seismic data taken in southern California and Japan, and studied their topological and dynamical properties. We have found that the distributions of connectivity decay as a power law in both regions. In the undirected network picture, we have shown that the values of the degrees of separation between two earthquakes chosen at random take small values between 2 and 3. We have found that the values of the clustering coefficient are about 10 times larger than those in the cases of completely random networks. In the directed network picture, we have studied two topologically-invariant statistical quantities : one is the period distribution and the other is the path length distribution. We have found that both of then are scale free.
We have published 7 papers in the related subjects. Two papers are in press and one paper is now under consideration for publication. We have given 4 talks at the annual meetings of the Physical Society of Japan and 5 at the international symposia.
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