2001 Fiscal Year Final Research Report Summary
Super-deep seismic reflection study in growth of continental crust beneath the Hidaka Collision Zone, Hokkaido
| Project/Area Number |
12304027
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Chiba University |
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Principal Investigator |
ITO Tanio Fac. Sci., Chiba Univ. professor, 理学部, 教授 (50111448)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAUCHI Takahiro Fac. Sci., Chiba Univ., Assoc. Professor, 理学部, 助教授 (99212241)
KANAGAWA Kyuichi Fac. Sci., Chiba Univ., Assoc. Professor, 理学部, 助教授 (40185898)
ISEZAKI Nobuhiro Fac. Sci., Chiba Univ., Professor, 理学部, 教授 (60107943)
SATO Hiroshi ERI, Univ., Tokyo Assoc. Professor, 地震研究所, 助教授 (00183385)
IWASAKI Takaya ERI, Univ., Tokyo Professor, 地震研究所, 教授 (70151719)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Hidaka Collision Zone / delamination / Pacific plate / seismic reflection study / growth of continental crust |
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| Research Abstract |
In order to detect the 3-D geometrical relationship between the descending Kuril arc delaminated at the middle lower crust and the upper surface of subducting Pacific plate, the super-deep seismic reflection experiment, Super-Deep Hidaka 2000, was conducted in the low noise-level area, Samani Town, southern part of the Hidaka Collision Zone. The target of this experiment is located down to 50 km deep. Seismic lines were set up in two directions, NW-SE (parallel to the Pacific plate subduction) and NE-SW (neally paralle to the Kuril arc collision). Total length of the lines reached 32 km long. Main specifications were as follows : Shot at about 300 m interval with 30 Sweeps in average(6-30 Hz, 24 sec) by 5 vibrators, 9 pick-ups / receiving point at 50 m interval. The basic processing produces fairly excellent profiles which is successful in exhibiting both the deeper part of the HMT (Hidaka Main Thrust) and the subducting Pacific plate. The image of descending Kuril arc is still unclear. Further processing will improve the present profiles and provide the new powerful data on the geometrical relationship between the descending Kuril arc and the subducting Pacific plate.
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