Development of sensor for measuring permanent displacement using servo-type velocity seismographs

开发使用伺服型速度地震仪测量永久位移的传感器

基本信息

批准号：
08558038
负责人：
SAWADA Sumio
金额：
$ 4.1万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

The earthquake damages of the lifeline such as buried pipelines are caused mainly by deformation of ground that is accompanied with liquefaction or landslides. It is important that the deformation of ground can be measured to estimate total damage of lifeline system at the early stage of restoration. But the sensors of ground displacement or liquefaction are not arranged in this time.Recently many servo-type velocity seismographs are arranged. As the frequency range of a servo-type seismographs is very wide, from 0.02Hz to 70Hz, the seismographs may measure the permanent displacement of the ground from the component of the low frequency range.The purpose of this study is to develop new method to estimate permanent displacement of the ground in the effective precision using servo-type seismographsAt first the response of the seismographs is simulated against the ground motion which include permanent displacement. As the result it is understood that the permanent displacement can be estimated if the seismic signal in the long period component can be removed from the record. But the influence of declination of the instruments is found to be considerably large.The method for estimating long period signals is developed using phase characteristics in short period range of the record. Group delay time is adopted to represent phase characteristics of seismic motions. We proposed the stocastic impulse train model for representing source process. It is concluded that the long period signals can be estimated to some extent from the phase characteristics of a short period component of earthquake motion.

埋地管道等生命线的地震破坏主要是由于地面变形并伴有液化或滑坡造成的。重要的是，可以测量地面的变形，以在恢复的早期阶段估计生命线系统的总损坏。但此时没有设置地面位移或液化传感器。最近有很多伺服式速度地震仪。由于伺服式地震仪的频率范围很宽，从0.02Hz到70Hz，地震仪可以从低频范围的分量中测量地面的永久位移。本研究的目的是开发新的方法来测量地面的永久位移。使用伺服型地震仪以有效精度估计地面永久位移首先，模拟地震仪对包括永久位移在内的地面运动的响应。结果可知，如果可以从记录中去除长周期分量中的地震信号，则可以估计永久位移。但发现仪器磁偏角的影响相当大。利用记录的短周期范围内的相位特性开发了估计长周期信号的方法。采用群延迟时间来表示地震运动的相位特征。我们提出了随机脉冲序列模型来表示源过程。结论是，从地震短周期分量的相位特征可以在一定程度上估计长周期信号。