| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The Notsukesaki barrier spit system (NBS) is part of an active barrier system facing Nemuro Strait. There are four clearly defined spit branches within the barrier system. We used topographic profiles, hand core and trenching, grain size analysis, AMS 14C dating, and tephrochronology to determine the chronology of the development of the four spits of the system. Taking into account the times of their emergence and the present elevations of the landward limits of their backshores, we constructed a relative sea level curve that is reasonably consistent with episodic regional coseismic events that have uplifted coastal areas along the southern Kuril subduction zone by 2-3 m at intervals of ~500 years. These events have interrupted a period of otherwise continuous subsidence in the study area since the 17th century and have led to the development of individual spits within the barrier system. Thus, we have demonstrated the seismotectonic control of the geomorphological evolution of NBS.
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