1995 Fiscal Year Final Research Report Summary
Seismotectonic structure of the Western Pacific arcs
| Project/Area Number |
06044049
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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 | Joint Research |
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| Research Institution | University of Tokyo |
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Principal Investigator |
SHIMAZAKI Kunihiko Earthquake Research Institute, Univ.of Tokyo, Professor, 地震研究所, 教授 (50012951)
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| Co-Investigator(Kenkyū-buntansha) |
TSUBOI Seiji Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 助手 (90183871)
SUETSUGU Daisuke Building Research Institute, Ministry of Construction, 建築研究所, 研究員
TAKEO Minoru Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 助教授 (00197279)
JUN M.S. 韓国地質鉱山物質研究所, 研究員
PUSPITO N.T. インドネシア, バンドン工大, 講師
XU GーM. 中国科学技術大学, 教授
DROZNINE D. ロシア科学アカデミー火山研究所, 計測地震学研究部, 研究員
TRETIAKOV V. ロシア共和国パラナ地震観測所, 所長
VIKULINE A.V ロシア科学アカデミー火山研究所, 計測地震学研究部, 主任研究員
GORDEEV E.I. ロシア科学アカデミー火山研究所, 計測地震学研究部, 研究部長
YOSHIDA Mitsuru Earthquake Research Institute, Univ.of Tokyo, 地震研究所, 助手 (00012948)
YAMADA Isao Faculty of Science, Nagoya Univ., 理学部, 助教授 (60022670)
NANANG T. Puspito Bandung Istitute of Technology, Indonesia
VLADIMIR Tretiakov Palana Seismological Observatory, Russia
DMITRI Droznine Institute of Volcanology, Russian Academy of Sciences
ALEXANDER V. Vikulin Institute of Volcanology, Russian Academy of Sciences
EVGENII IL'ICH Gordeev Institute of Volcanology, Russian Academy of Sciences
XU Guoming University of Sciences and Technology of China
MYUNG-SOON Jun Korea Institute of Geology, Mining and Materials
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| Project Period (FY) |
1995 – 1996
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| Keywords | broadband seismic station / Kamensokoye, Russia / Parapat, Indonesia / Ponpei, Micronesia / Pohang, Korea / STS-1 seismographs / optical magnetic disk recording / ERIOS system |
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| Research Abstract |
A new broadband seismic station was installed at Kamensokoye, Northern Kamchatka, Russia. The STS-1 seismographs are installed in an underground seismic vault. The temperature in winter is as low as -50 to -60C,but the temperature in the vault is below but near 0 degree and the three component STS-1 seismographs are in operation.
The broadband seismic station at Parapat, Sumatra, Indonesia was upgraded. First a seismic vault was constructed to avoid thermal disturbances caused by sunlight radiation. Long-period large noises found in the previous broadband records at this station cannot be found in the records obtained in a new vault. Also new power units were installed to minimize the interruption of recordings due to electric power stoppage. Secondly digital magnetic tape recording was replaced by optical magnetic disk recording, which proves to be more stable. Further STS-2 instruments were replaced by STS-1 seismographs and the replacement made possible to record seismic motions at longer periods.
At Ponpei, Micronesia and Pohang, Korea broadband seismic observation is continuing and good data were collected. At Ponpei, signal cables from the seismic vault to the recording room were replaced and were buried to avoid any meteorological or artificial cutting of cables.
Digital waveform data at Ponpei were converted to compressed formatted data and are nearly ready to be open to researchers through the ERIOS system at the Earthquake Research Institute, University of Tokyo. Digital waveform data at Parapat station are available to researchers in Japan and abroad through the ERIOS system. The data were accessed from US and other countries.
An analysis of seismic data together with other geophysical data shows that the entire island arc of Indonesia can be divided into three distinct arc regions : West Sunda arc, East Sunda arc and Banda arc. Also large earthquakes along the Kamchatka, Kuril and Japan arcs are analyzed on the basis of pattern of spatial migration.
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