| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The method of Focal Mechanism Tomography (FMT) is an inversion method to estimate pore fluid pressures from earthquake focal mechanism solutions (Terakawa et al., 2010). We improved the original method so that we can estimate the evolution of pore fluid pressure fields for the purpose of understanding roles of fluid and stress in earthquake generation (Terakawa, 2014). Application of the method to induced seismicity in the Basel enhanced geothermal system in Switzerland shows the evolution of pore fluid pressure in response to fluid injection experiments. The induced events were primarily controlled by a decrease in fault strength due to an increase in pore fluid pressures. However, the largest event (the mainshock) was not directly related to a drastic decrease in fault strength at the hypocenter. The precise relative location of the hypocenters indicated that substantial stress loading by the preshocks on the same fault plane promoted the dynamic rupture of the mainshock.
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