Study on Reconstruction and Prediction of Active Fault Activity in the Nankai Trough using Pinpoint Sediment Sampling
| Project/Area Number |
16201037
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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 |
Natural disaster science
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ASHI Juichiro The University of Tokyo, Graduate School of Frontier Sciences, Associate Professor (40251409)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRAI Masaaki The University of Tokyo, Ocean Research Institute, Assistant Professor (50359668)
GAMO Toshitaka The University of Tokyo, Ocean Research Institute, Professor (70143550)
TOKUYAMA Hidekazu The University of Tokyo, Ocean Research Institute, Professor (10107451)
YAMANO Makoto The University of Tokyo, Earthquake Research Institute, Associate Professor (60191368)
MURAYAMA Masafumi Kochi University, Center for Advanced Marine Core Research, Associate Professor (50261350)
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| Project Period (FY) |
2004 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥42,120,000 (Direct Cost: ¥32,400,000、Indirect Cost: ¥9,720,000)
Fiscal Year 2007: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2006: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2005: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2004: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
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| Keywords | Active Fault / Nankai Trough / Cold Seep / Mud Volcano / Kumano Trough / Turbidite / Splay Fault / Event Deposit / 湧水量計 / 半遠洋性堆積層 / 巨大分岐断層 / バライト / ガンマ線 / 付加プリズム / 順除外スラスト / 地すべり / 四国海盆 / 紀伊半島南東沖地震 / 順序外スラスト |
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| Research Abstract |
Detailed distributions of active faults have been revealed by recent high-resolution survey of crustal structure and seafloor topography. In contrast, study on sediment sample around faults is not investigated well in deepsea although samplings in shallow water have been conducted. ORI, Univ. Tokyo developed a remotely operated vehicle dedicated to pinpoint sampling in deepsea in 2002. Primary objective of our study is to reveal timing and deformation style of active faults in the Nankai area by pinpoint sampling around faults. Secondary objective is to obtain seep activity data as basic information for future long-term monitoring along active faults. Main results are shown in below.
1. Ryuyo Canyon : It is an abandoned canyon without sediment source in shallow water. Core samples at two sites indicate turbidite layers deposited every three to six hundred years.
2. Kumano Mud Volcano : Mud volcanoes composed of erupted materials from subbottom are developed along the active fault. Samples were taken from the area characterized by debris flow from the summit. Three debris mud layers were recognized suggesting eruptions in every ten to two thousands years.
3. Splay fault : Talus deposits are existed at the small terrace where a large splay fault cuts the seafloor. Core samples from the talus are interpreted to be seismic trigged deposits and suggest every one thousand year's recurrence.
We were also able to obtain flow data at cold seep sites for fifteen month suggesting fade-out of activity Moreover, video images at sea water column were successfully taken just after the 2004 southeast off Kii peninsula earthquake. Cloudiness between the seafloor and 200 meters above it suggests occurrences of landslides near the epicenter
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Report
(5 results)
Research Products
(55 results)
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[Presentation] 泥火山の微細構造と発達過程2007
Author(s)
芦 寿一郎
Organizer
日本地質学会第114年学術大会
Place of Presentation
北海道大学
Year and Date
2007-09-10
Description
「研究成果報告書概要(和文)」より
Related Report
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