权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of the portable and low power GPS system for geodetic observations near volcanoes and active faults

开发用于火山和活动断层附近大地测量的便携式低功耗 GPS 系统

基本信息

批准号：
09554021
负责人：
MORITA Yuichi
金额：
$ 8.26万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09554021/
关键词：
Crustal Movement Earthquake Swarm GPS Observation GPS観測 GPS受信機

项目摘要

The aim of this research project is developing the GPS system for densely installed observation of the crustal movement near volcanoes and active faults. To realize it, the system should have the specification of high-portability and low-power consumption, because we often face difficulties to use the electric power line and automobile-accessible roads near volcanoes and active faults.In 1997, we examined the performance of a GPS receiver board for automobile navigation system, which are revised for carrier phase differential GPS observation. From the results of several examinations, it proved that the repeatability of the receiver was less than 5mm in the case that the measurement distance is less than 10km, and the receiver was available for our purpose. We made prototype of the GPS observation system composed of the receiver and a recording system with huge memory (1GB hard-disk).In 1998, we installed ten prototype systems around Ito city, Shizuoka prefecture where the earthquake swarm activity is very high. On April 20, 1998, a swarm activity began and lasted around one month. Fortunately, we could get the data in good conditions of high time resolution (sampling 1Hz). The data is now analyzed, and support the following processes ; 1) A crack beneath Off-Ito began to open, just after the earthquake swarm activity started. 2) The opening crack movement increased rapidly and decreased gradually. 3) Accompany with the opening crack movement, the dislocation movement caused by the grater earthquakes (mainly M>4) are added with the movement.We continue the observation at Ito. And we started the temporal observation at the focal region of 1999 Chi-chi earthquake in Taiwan for detecting the aftershock deformation of it.

该研究项目的目的是开发用于火山和活动断层附近密集安装的地壳运动观测的 GPS 系统。为了实现这一目标，系统应该具有高便携性和低功耗的规格，因为我们经常面临火山和活断层附近的电力线和汽车通行道路的使用困难。1997年，我们测试了汽车导航系统的GPS接收板的性能，该接收板针对载波相位差分GPS观测进行了修改。多次测试结果证明，在测量距离小于10km的情况下，接收机的重复性小于5mm，可以满足我们的需要。我们制作了由接收器和大内存记录系统（1GB硬盘）组成的GPS观测系统原型。1998年，我们在地震群活动非常频繁的静冈县伊东市周围安装了10个原型系统。 1998年4月20日，一场群居活动开始，持续了一个月左右。幸运的是，我们能够在高时间分辨率（采样1Hz）的良好条件下获得数据。现在对数据进行分析，并支持以下流程； 1) 地震群活动开始后，伊东外地下方的裂缝开始张开。 2)张开裂纹运动迅速增大并逐渐减小。 3) 伴随着张开裂纹的运动，较大地震(主要是M>4)引起的位错运动也随之加入。我们继续在伊东进行观测。我们对1999年台湾集集地震震源区进行了时间观测，探测其余震形变。