Hi-net速度微分与KiK-net加速度对比研究  

A comparative study on Hi-net velocity differential and KiK-net acceleration

作　　者：冯静[1] 高孟潭[1] 胥广银[1] 陈鲲[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震学报》2013年第6期902-913,共12页Acta Seismologica Sinica

基　　金：国家科技支撑(2008BAK49B04-04);地震行业专项(201108002;201108014)共同资助

摘　　要：首先介绍了日本防灾科学技术研究所Hi-net和KiK-net台网布设情况和数据格式,然后利用Hi-net和KiK-net共同记录到的282次Mj≥5.0、震源深度≤100km的地震,分析了Hi-net速度微分与KiK-net加速度对数峰值比、对数反应谱比的分布特征及其随震级、距离的变化关系,讨论了速度微分结果在幅值和频谱两方面的不确定性.结果表明,数字型速度记录微分与观测加速度无论是峰值还是频谱均存在一定差异,不能将其直接用作加速度.考虑到对数峰值比和对数反应谱比在不同震级档、距离档存在一定规律,因此对速度微分结果的峰值和特定周期的反应谱除以一定的系数,可以降低数字型速度记录数值微分造成的不确定性.另外,也可采用概率的形式描述这种不确定性.This paper introduces the configuration and data format of Hi-net and KiK net constructed and operated by National Research Institute for Earth Sci- ence and Disaster Prevention of Japan. In order to analyze the uncertainty of ve- locity differential in both amplitude and spectrum, we study the distribution of natural logarithm of peak acceleration ratio and natural logarithm of acceleration response spectrum ratio between Hi net velocity differential and KiK-net ob served acceleration, as well as the ratios above in relation to magnitude and fo- cal distance, using the data recorded by both Hi-net and KiK net from 282 Mj≥ 5.0 earthquakes with focal depth less than 100 km. It turns out that the differ ential of digital velocity record is different from the observed acceleration in both amplitude and spectrum, so the former can not be directly treated as accel- eration. Since the distribution of the two ratios mentioned above show some regular pattern, dividing peak acceleration or response spectrum at given period by some coefficient can reduce the uncertainty resulting from numerical differen- tiation of digital velocity record. Besides, the uncertainty can also be described in the way of probability.

关 键 词：Hi-net KiK-net 速度记录 加速度记录 数值微分 峰值比 反应谱比 

分 类 号：P315.9[天文地球—地震学]