| Project/Area Number |
08041099
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TAKANO Bokuichiro The University of Tokyo, Grauduate School of Arts and Sciences Professor, 大学院・総合文化研究科, 教授 (90012426)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIMORI Kenji Lecture, Toho School of Medicine, 医学部, 講師 (30130678)
OHBA Takeshi Associate Professor, Tokyo Inst, Technology, 草津白根観測所, 助教授 (60203915)
SUZUKI Katsuhiko Assistant, Gradeate School of Arts and Sciences, The University of Tokyo, 大学院・総合文化研究科, 助手 (70251329)
TJETJEP Wimpy S. インドネシア火山研究所, 所長
BERNARD Alain Professor, Universite Libre de Bruxelles, 地球科学科, 教授
FAZLULLIN Sergey M. Head of Geochemistry Division, Institute of Volcanology, Russia
TJETJEP Wimp インドネシア火山調査所, 所長
FAZLULLIN Se ロシア科学アカデミィ付属, カムチャッカ火山研究所, 主任研究院
BERNARD Alai ブラッセル自由大学, 地球科学科, 教授
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| Project Period (FY) |
1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1996: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | crater lake / Indonesia / Ijen / bathmetry / volcanic gases / eruption / polythionates / hyperacidic |
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| Research Abstract |
The survey trip to Indonesia started from July 26 and ended on August 17 during which we conducted the following survey : (1) Bathymetric survey of Kawah Ijen ; (2) Water sampling at several depths ; (3) Measurements of dissolved gases at each depth ; (4) Sampling and temperature measurement of subaqueousmolten slfur pools ; (5) Volcanic gas sampling solfataric area near Ijen crater lake ; (6) Sampling water from river, fresh water lakes for hydrogen and oxygen isotope ratio measurements. The results obtained are ; Maximum depth is 165m, slightly shallower than the depth (200m) at the period of Dutch Colony. This is partly because of a lom lowering of the lake level and mainly due to *etrital sediments from the catchment area ; (2) We ere unsuccessful in positioning molten sulfur pools at the lake floor, probably because the fumarolic activity at the lake bottom has been decreasing and the size of the pool may be too small to catch ; (3) Sulfur dioxide gas in the lake water ranges from 34 to 45 ppm. however, hydrogen sulfide gas was not detected except for one surface water. This fact strongly suggests that sulfur dioxide/hydrogen sulfide ratio of the subaqueous fumarolic gase is round 0.7 ; (4) Polythionates in the water range from 700 to 800 ppm.
We invited Ms. Sri Smarti from Indonesia to Japan for training analytical technique of polythionates and visiting Kusatsu-Shirane Observatory and Hakone Volcano from September 30 to October 13.
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