| Project/Area Number |
14380031
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
自然地理学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
OKUMURA Koji Hiroshima University, Graduate School of Letters, Professor, 大学院・文学研究科, 教授 (10291478)
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| Co-Investigator(Kenkyū-buntansha) |
UMITSU Masatomo Nagoya University, Graduate School of Environmental Studies, Professor, 大学院・環境学研究科, 教授 (50127883)
NAKAMURA Toshio Nagoya University, Center for Chronological Research, Professor, 年代測定総合研究センター, 教授 (10135387)
KAYANNE Hajime Tokyo University, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (60192548)
NAGAOKA Shinji Nagasaki University, Faculty of Education, Associate Professor, 教育学部, 助教授 (80244028)
SUZUKI Takehiko Tokyo Metropolitan University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (60240941)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2004: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2003: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2002: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | Radiocarbon dating / High-precision date / Late Quaternary / Volcanic Eruption / Tephra / Holocene / Paleoearthquake / Calibrated age / 後期更新性 |
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| Research Abstract |
Low-background liquid-scintilation counter for high-precision radiocarbon dating in Hiroshima University began routine measurement. Microsopic observation with digital image records helps to examine radiocarbon samples to evaluate the possibility of contamination by young organic matters. Serial dates from geologic sections were submitted to Bayesian analyses using dendrocorrection programs. With this method, objective and reliable procedures were established to determine the ages of event horizons such as volcanic eruptions and earthquakes. Through all core boring of Aso and Kuju Holocene tephra sections in central Kyushu, standard method for high-precision tephrochronology was established. The core also brought the best stratigraphic sequence of volcaninc activities in central Kyushu and standard chrno-stratigraphic information. For the reconstruction of environmental changes in Late Holocene, complete geologic sections of one to two thousand years were retrieved from three bore holes in northern Kyushu. Radiocarbon dating, micro- and macro-paleontological analyses are underway.
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