| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2013: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2012: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Outline of Final Research Achievements |
We have studied how to determine the depth of magma reservoir of active volcanoes precisely by petrological method. Selected key variables obtained by chemical analyses on a suite of volcanic ejecta were compared with phase diagrams determined by high-pressure experiments and thermodynamic calculations, and some variables were revealed to be effective to constrain the pressure and temperature condition of the magma reservoir. The effectiveness of the method was examined using two volcanic activities, 2011Shinmoe-dake eruption and current Sakurajima eruption, because the depths of magma reservoirs of both eruptions were physically well determined.
An advantage of the petrological method is that we can get the information of old magma reservoirs by using past volcanic ejecta. We analyzed pyroclasts from 1707 Hoei eruption of Mt. Fuji and Aira pyroclastic eruption (29ka) and assessed the depths and temperatures of their magma reservoirs.
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