Short-term variation and history of cold seep activity along active faults off Tokai
东海附近活动断层沿线冷泉活动的短期变化和历史
基本信息
- 批准号:13440144
- 负责人:
- 金额:$ 9.66万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
A large number of sea bottom gamma ray data have been obtained using JAMSTEC submersibles and ROVs, and have been discussed about relations to geological background. However, γ -ray spectrometers attached with the submersible or vehicle are affected by relatively short measurement time and seafloor disturbance during landing and taking-off. We developed a stand-alone system of gamma ray measurement, named GRAMS (Gamma Ray Monitoring System) and tested it in the Sagami Bay. Total intensity of gamma ray and radionuclide contents monitored for about two days are relatively constant and show no periodic variation. We carried out GRAMS to know spatial distribution of gamma ray along the out-of-sequence thrust in the central Nankai accretionary prism. It is evident that total intensity of gamma ray and radionuclide contents of Th-series and U-series at cold seep sites are higher than those at normal seafloor. Twenty-two day's records of gamma ray monitoring by GRAMS show very high intensity and high anomaly of U-series radionuclide at the seep site. However, all values show no fluctuation with time. This suggests that gamma ray is not sensitive to seep itself but attributed to accumulation of radionuclide, probably derived from damaged rock of the fault zone, within surface sediments.
利用JAMSTEC潜水器和水下机器人获得了大量海底伽马数据,并对其与地质背景的关系进行了讨论。然而,与潜水器或载体相连的γ-ray能谱仪在着陆和起飞过程中受到测量时间较短和海底干扰的影响。我们开发了一个独立的伽马射线测量系统,名为GRAMS(伽马射线监测系统),并在相模湾进行了测试。监测两天左右的伽马射线总强度和放射性核素含量相对恒定,没有周期性变化。我们进行了伽马射线在南开中央吸积棱柱无序逆冲推覆过程中的空间分布研究。结果表明,冷渗漏区Th系列和U系列的伽马射线总强度和放射性核素含量明显高于正常海底。22天的伽马射线克数监测记录表明,渗漏现场的U系列放射性核素强度很高,异常程度很高。然而,所有的值都不随时间波动。这表明伽马射线对渗漏本身并不敏感,但可归因于放射性核素在表层沉积物中的积累,这种放射性核素可能来自断裂带的受损岩石。
项目成果
期刊论文数量(26)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Juichiro ASHI, Masataka KINOSHITA, Shin'ichi KURAMOTO, Sumito MORITA, Saneatsu SAITO: "Seafloor gamma ray measurements around active faults by stand-alone system"JAMSTEC Journal of Deep Sea Research. 22. 179-187 (2003)
Juichiro ASHI、Masataka KINOSHITA、Shinichi KURAMOTO、Sumito MORITA、Saneatsu SAITO:“独立系统对活动断层周围的海底伽马射线测量”JAMSTEC 深海研究杂志。
- DOI:
- 发表时间:
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- 影响因子:0
- 作者:
- 通讯作者:
芦 寿一郎: "海底設置型装置による活断層周辺のガンマ線測定"JAMSTEC深海研究. 22. 179-187 (2003)
Juichiro Ashi:“使用潜艇设备对活动断层周围的伽马射线进行测量”JAMSTEC 深海研究 (JAMSTEC Deep Sea Research)。
- DOI:
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- 影响因子:0
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- 通讯作者:
Juichiro ASHI, Kan AOIKE, Yasuyuki NAKAMURA, Saneatsu SAITO, Shin'ichi KURAMOTO, Masataka, KINOSHITA, Sumito MORITA, Urumu TSUNOGAI, Shigeaki KOJIMA, Pierre HENRY: "Geological Structure and Cold Seep at the Daini-Atsumi Knoll off Enshu-Nada"JAMSTEC Journa
Juichiro ASHI、Kan AOIKE、Yasuyuki NAKAMURA、Saneatsu SAITO、Shinichi KURAMOTO、Masataka、KINOSHITA、Sumita MORITA、Urumu TSUNOGAI、Shigeaki KOJIMA、Pierre HENRY:“远州滩第二渥美山的地质结构和冷泉”
- DOI:
- 发表时间:
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- 影响因子:0
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徳山 英一: "日本周辺海域中新世最末期以降の構造発達史"海洋調査技術. 13・1. 27-53 (2001)
德山荣一:“日本周边海域中新世末以来的构造发展史”海洋调查技术13・1(2001)。
- DOI:
- 发表时间:
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- 影响因子:0
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Juichiro ASHI: "Growth of the accretionary prism and origin of cold seep in the Nankai Trough"Kaiyo Monthly. 35. 296-301 (2003)
芦十郎:《南海海槽吸积棱柱的生长和冷泉的起源》《海洋月刊》。
- DOI:
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- 影响因子:0
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ASHI Juichiro其他文献
ASHI Juichiro的其他文献
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{{ truncateString('ASHI Juichiro', 18)}}的其他基金
Deformation structures and active processed of Enshu active faults
恩州活动断裂的变形构造及活动过程
- 批准号:
20510169 - 财政年份:2008
- 资助金额:
$ 9.66万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on Reconstruction and Prediction of Active Fault Activity in the Nankai Trough using Pinpoint Sediment Sampling
南开海槽活动断层活动精确沉积物采样重建与预测研究
- 批准号:
16201037 - 财政年份:2004
- 资助金额:
$ 9.66万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
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