2009 Fiscal Year Final Research Report
Development of a method to estimate underground stress state using rock physics theory
| Project/Area Number |
20760568
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Earth system and resources enginnering
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| Research Institution | Kyoto University |
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Principal Investigator |
TSUJI Takeshi Kyoto University, 大学院・工学研究科, 助教 (60455491)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 地下応力 / 地震波速度 / S波偏向異方性 / 固体地球物理学 / 地盤工学 / 海洋探査 / 海洋資源 / 資源開発工学 |
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| Research Abstract |
Prediction of pore pressure as well as effective stress is important to avoid drilling disaster, construct subsurface structure and monitor seismogenic faults. To predict pore pressure and effective stress, we estimate Poisson's ratio (or Vp/Vs ratio) from ocean bottom seismometer data using a newly-developed method. Poisson's ratio is strongly dependent on underground stress state. From the estimated seismic velocities, we predict effective stress and pore pressure using rock physics theory. Furthermore, we use S-wave characteristics in order to estimate principal stress direction and fracture alignment.
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