Studies of seafloor geodetic measurements on observation platforms adapted for sediments
适用于沉积物的观测平台的海底大地测量研究
基本信息
- 批准号:12440119
- 负责人:
- 金额:$ 9.02万
- 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:2000
- 资助国家:日本
- 起止时间:2000 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Subduction zones around Japan are covered with sediments, where precise geodetic measurements for observation of seafloor crustal movements can be difficult. This study aims at examining the stability of seafloor geodetic measurements on the sediments: tilt measurements on a platform with pipes installed in sefloor sediments, precise point positioning and observation of ocean bottom pressure variations with self-landing instrumentsWe have developed two sets of ocean bottom tiltmeter system for deployment by a remotely operated vehicle. The tiltmeter was divided into two parts for operation on the seafloor. A procedure for automatic leveling of the gimbals was improved to reduce consumption of the batteriesWe have confirmed resolution and stability of qaurtz pressure sensor through analysis of ocean bottom pressure data observed by three sensors over a spreading axis of the southern Pacific Rise for 14 manths in 1997-98. All of the sensors recorded pressure increase following the demise of the big 1997-98 El Nino event. The pressure variation suggests an ocean dynamics which can explain an abrupt change of J2 term of the Earth's gravity field. The results also suggest depression of the seafloor near the spreading centerIn July 2002 we could visually observe how a seafloor instrument for point positioning was deployed on the seafloor covered with thick sedimentary layer. The base of the instrument, 1m square of FRP mesh, looked quite stable and sunk only 1cm or less after deployment of 1year. We could confirm that we can carry out precise pressure monitoring and point positioning on thick sediments by using such a base
日本周围的俯冲带覆盖着沉积物,在这些区域进行精确的大地测量以观察海底地壳运动可能很困难。本研究旨在检验海底沉积物大地测量的稳定性:在海底沉积物中安装管道的平台上进行倾斜测量,利用自着陆仪器进行精确点定位和海底压力变化观测我们开发了两套海底倾斜仪由远程操作车辆部署的系统。倾斜计分为两部分,以便在海底操作。改进了万向节自动调平程序,以减少电池消耗。通过分析 1997 年南太平洋海隆扩张轴上的三个传感器观测到的 14 个月的海底压力数据,我们确认了石英压力传感器的分辨率和稳定性。 -98。所有传感器都记录到 1997-98 年厄尔尼诺事件结束后压力增加。压力变化表明海洋动力学可以解释地球重力场 J2 项的突然变化。结果还表明,扩散中心附近的海底凹陷。2002年7月,我们可以直观地观察到用于点定位的海底仪器是如何部署在厚厚的沉积层覆盖的海底的。仪器底座为1m见方的玻璃钢网格,看上去相当稳定,部署1年后仅下沉1cm或更小。可以确认利用这样的底座可以对厚厚的沉积物进行精确的压力监测和点位定位
项目成果
期刊论文数量(51)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Nishimura,Miura et al.: "Distribution of seismic coupling on the subducting plate baundary"Tectonophysics. 323・. 217-238 (2000)
Nishimura、Miura 等:“俯冲板块边界上的地震耦合分布”Tectonophysicals 323・238(2000)。
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Fujimoto, H.: "On the stability of horizontal positions of acoustic transponders for seafloor geodesy deployed on thick sediment"EOS Trans., AGU. 83・47. F354 (2002)
Fujimoto, H.:“关于部署在厚沉积物上的海底大地测量的声学转发器的水平位置的稳定性”EOS Trans.,AGU 83・47(2002)。
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藤本博巳,友田好文: "重力からみる地球"東京大学出版会. 172 (2000)
Hiromi Fujimoto、Yoshifumi Tomoda:“从重力角度看地球”,东京大学出版社 172 (2000)。
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- 影响因子:0
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Tamaki, T.: "Observation of seafloor crustal movement and ocean dynamics around Japan with ocean bottom pressure gauges"AGU Fall Meeting, EOS Trans, AGU. F1170 (2001)
Tamaki, T.:“用海底压力计观测日本周围的海底地壳运动和海洋动力学”AGU 秋季会议,EOS Trans,AGU。
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- 影响因子:0
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Kanazawa, T.: "Northwest Pacific Seismic Observatory and Hammer Drill Tests"Proc.ODP, Init. Repts.191,1-159:College Station TX 77845-9547,USA.. (CD-ROM). (2001)
Kanazawa, T.:“西北太平洋地震观测站和锤钻测试”Proc.ODP,Init。
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FUJIMOTO Hiromi其他文献
FUJIMOTO Hiromi的其他文献
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{{ truncateString('FUJIMOTO Hiromi', 18)}}的其他基金
Multi-scale types of slow earthquakes based on ocean-bottom geodetic and seismological observations
基于海底大地测量和地震观测的慢地震多尺度类型
- 批准号:
20244070 - 财政年份:2008
- 资助金额:
$ 9.02万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Investigation for geodetic detection of variation in crustal deformation near the subduction plate boundary
俯冲板块边界附近地壳变形变化的大地测量研究
- 批准号:
15340142 - 财政年份:2003
- 资助金额:
$ 9.02万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
International Cooperative Research on the Mid-Ocean Ridges
大洋中脊国际合作研究
- 批准号:
06044050 - 财政年份:1994
- 资助金额:
$ 9.02万 - 项目类别:
Grant-in-Aid for international Scientific Research
International Cooperative Research of the Mid-Ocean Ridges
大洋中脊国际合作研究
- 批准号:
04044044 - 财政年份:1992
- 资助金额:
$ 9.02万 - 项目类别:
Grant-in-Aid for international Scientific Research
Joint Study on the Geodynamics of Crustal Accretion
地壳增生地球动力学联合研究
- 批准号:
03044041 - 财政年份:1991
- 资助金额:
$ 9.02万 - 项目类别:
Grant-in-Aid for international Scientific Research