2009 Fiscal Year Final Research Report
Theoretical study to estimate heterogeneity on a fault by seismic waves
| Project/Area Number |
19540434
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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 |
Solid earth and planetary physics
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| Research Institution | Hokkaido University |
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Principal Investigator |
MURAI Yoshio Hokkaido University, 大学院・理学研究院, 准教授 (40301931)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 断層破砕帯 / 亀裂 / 散乱 / 異方性 / 低速度層 / トラップ波 / 理論地震波形 / 地震波スペクトル |
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| Research Abstract |
Major crustal faults form fault zones. We assume several models as a fault zone and compute synthetic seismograms of the displacement field radiated from a seismic source embedded in a fault zone. The amplitude spectra depend on the fault zone structure. The width of the fault zone of the 1992 Landers earthquake is estimated to be about 250m. The dominant length and density of the cracks distributed in the fault zone are estimated to be about 60m and νa^2=0.12, where ν and a are number density and half length of cracks.
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