| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
|
|---|
| Outline of Final Research Achievements |
A new method of stress tensor inversion was developed to automatically detect multiple stress states from heterogeneous fault-slip data. The method determines the number of stresses by Bayesian information criterion with mixture probability distribution in the deviatoric stress space. Firstly, the method was applied to faults cutting Quaternary sediments around the Beppu bay area, SW Japan and successfully detected a change in the orientation of tensional stress axes around 1 Ma. Secondly, faults in a tectonic melange in the Cretaceous to Paleogene Shimanto Belt were analyzed. The detected stresses were interpreted as normal-faulting stress states just under the subduction plate boundary. Additionally, a computerized method to determine frictional coefficient from the orientation distribution of fault planes was developed. It was applied to the faults in the melange and extremely low friction coefficients (0.1-0.2) were obtained.
|
