2002 Fiscal Year Final Research Report Summary
Research on Seismicity and Active Tectonics in the Northern Part of Ishikari Basin
| Project/Area Number |
12792001
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | Hokkaido University |
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Principal Investigator |
KASAHARA Minoru Hokkaido University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (40001846)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Yoshiki Hokkaido Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (60000858)
WATANABE Teruo Hokkaido University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (40135900)
SASATANI Tutomu Hokkaido Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (10002148)
TAJIKA Jun Hokkaido University, Geological Survey of Hokkaido, Researcher, 研究員
OKA Takao Hokkaido University, Geological Survey of Hokkaido, Senior Researcher, 主任研究員
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| Project Period (FY) |
2000 – 2002
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| Keywords | Deep borehole seismometer / Micro-earthquake / Neo-tectonics / Ishikari-basin / Gravity anomaly |
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| Research Abstract |
A borehole with 750m deep has been constructed for installation high sensitive seismometer and to reveal the geological chronology of Quaternary and Neogene formations beneath Sapporo-city by using many boring data. According to epicenter location by using this new station and seismic network operated by Sapporo-city a clear seismic belt trending from northwest to southeast is recognized. This coincides the direction of the boundary between mountain and basin located at western part of Sapporo-city. Rapid depth change of the top of Pliocene formation is also founded on this line. This will be explained as the reverse faulting with dipping of the western side. There is also steep gravity Bouguer anomaly along this trend of seismic activity with high anomaly at west side and low one at east side.
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