Preliminary study of ocean bottom geoscience station using trans-Pacific telecommunication cable

利用跨太平洋通信电缆建立海底地球科学站的初步研究

基本信息

批准号：
01420010
负责人：
YUKUTAKE Takeshi
金额：
$ 18.5万
依托单位：
Earthquake Research Instutute, University of Yokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

The purpose of this project is to study the feasibility of submarine telecommunication cable re-use, specially GeO-TOC cable which runs between Ninomiya and Guam, build a prototype submarine instrument aiming to test the above purpose and examine this prototype instrument. The submarine telecommunication system was studied and key factors in the submarine cable system were reviewed. A prototype instrument equipping seismic sensors, geomagnetic sensors, a tsunami sensor and two kinds of thermometers was built. The 3 component of velocity type and acceleration types are used as seismic sensor. Three component fluxgate magnetometer and a proton-magnetometer are used as geomagnetic purpose. A differential hydrophone is used both as tsunami and seismic purposes. Two different kinds of thermometers, quartz and semiconductor types are used. The seismic signals are digitized by 20 bit A/D with 10OHz., are transmitted to the mixture part and are multiplexed with slow data such as geomagnetic. differential hydrophone and thermometer outputs which are sampled by 16 bit A/D with I Hz. All signals are transmitted to the land station through coaxial cable and are saved in DAT by real time. This prototype instrument was successfully tested at the ocean bottom 1 km off the coast of Hiratsuka, Japan. This experiment proved the powerfulness of these sensors in the real observation in the situation of co-observation of different items, but there remained the necessity to reduce the power consumption of A/D converter and its controller.

该项目的目的是研究海底电信电缆重复使用的可行性，特别是在Ninomiya和关岛之间运行的地理线电缆，建立了一种原型海底仪器，旨在测试上述目的并检查该原型仪器。研究了潜艇电信系统，并审查了海底电缆系统中的关键因素。建造了配备地震传感器，地震传感器，海啸传感器和两种温度计的原型仪器。速度类型和加速类型的3个组件用作地震传感器。三个组件通量磁力计和质子 - 磁铁计被用作地磁目的。一种差异的水文既用作海啸和地震目的。使用了两种不同类型的温度计，石英和半导体类型。将地震信号用10 h/d数字化，用10ohz。将其传输到混合物部分，并用慢速数据（例如地磁）多路复用。差分水管和温度计输出通过I Hz对16位A/D进行采样。所有信号均通过同轴电缆传输到陆地站，并在DAT中实时保存。该原型仪器在日本广田沿岸的海底1公里处成功进行了测试。该实验证明了这些传感器在对不同项目的共同观察情况下的真实观察中的强大性，但是仍然有必要减少A/D转换器及其控制器的功耗。