集集地震与汶川地震、美国西部地震的近场区视波速比较

英文篇名：Apparent wave velocity comparison among near seismic zones of Chi-chi earthquake, Wenchuan earthquake,and earthquake of western area of US
中文刊名：振动与冲击
英文刊名：Journal of Vibration and Shock
作者：赵世伟 ; 罗奇峰
英文作者：ZHAO Shi-wei1 ; LUO Qi-feng2(1.Structural Engineering and Disaster Prevention Research Institute ; Tongji University ; Shanghai 200092 ; China ; 2.Shanghai Institute of Disaster Prevention and Relief ; Tongji University ; Shanghai 200092 ; China)
中文关键词：转动分量 ; 集集地震 ; 群速度 ; 视波速
英文关键词：rotational component ; Chi-chi earthquake ; group velocity ; apparent wave velocity
出版日期：2013-07-28
机构：同济大学结构工程与防灾研究所;同济大学上海防灾救灾研究所;
年：2013
期：14
出版单位：振动与冲击

摘要

视波速是由地震动平动分量计算转动分量的重要参数,利用10个台站30条集集地震波加速度记录按文中所述方法得出该场地视波速,并与他人计算的汶川地震和美国西部地区的近场视波速进行了比较。比较结果表明,由集集地震的视波速曲线与他人用同样方法分别从汶川地震记录和美国地震记录得到的视波速大小与变化情况均有不同,这种差别会直接影响转动分量的计算精度。美国西部地区随频率增加又减小的趋势,但其他两个地区随频率保持缓慢增加。
The apparent wave velocity is an important parameter to calculate rotational components of an earthquake with its translation ones.Using 30 seismic wave acceleration records of 10 stations for Chi-chi earthquake,the group wave velocity and the visual wave velocity of the near zone of Chi-chi earthquake were calculated with the presented method here.The results were compared with the field wave velocities for Wenchuan earthquake and the earthquake of the western area of US.It was shown that the appearent wave velocity and its variation for Chi-chi earthquake are different from those for Wenchuan earthquake and the earthquake of the western area of US;the differences directly influence the calculating accurcy of rotational components;the apparent wave velocity for the earthquake of the western area of US decreases with increase in frequency;however,those for the other two earthquakes slowly increase with increase in frequency.

引文

[1]Luo Q F,Che W.TFRS of rotational ground motions and itsapplication[C].2009 ANCER Workshop.
    [2]廖振鹏,魏颖.设计地震加速度图的合成[J].地震工程与工程振动,1988,8(4):10-18.LIAO Zhen-peng,WEI Ying.Design earthquake accelerationfigure synthesis[J].Earthquake Engineering and EngineeringVibration,1988,8(4):10-18.
    [3]Yang F,Luo Q F.Torsional phenomena in 2008 greatWenchuan earthquake[J].Earthquake Science,2010,23(1):79-85.
    [4]洪钟,罗奇峰.地震动转动分量研究[D].上海:同济大学,2010.
    [5]Lee V W,Trifunac M D.Torsional acceler-ograms[J].Int.JSoil Dynamics and Earthquake Engineering,1985,4(3).
    [6]Lee V W,Trifunac M D.Trifunac.Rocking Strong EarthquakeAccelerations[J].Soil Dynamics and Earthquake Engineering,1987,6(2).
    [7]黄蓓.基于集集地震记录的近断层地震动特性分析[D].北京:中国地震局地球物理研究所,2003.
    [8]孙士军,陈国兴.地面运动转动分量的合成方法[J].地震学刊,1998,(1):19-24.SUI Shi-jun,CHEN Guo-xing.The ground motion rotationsynthesis methods[J].Journal of Earthquake,1998,(1):19-24.
    [9]王君杰,胡聿贤.地震动旋转分量的研究[J].地震工程和工程振动,1991,11(2):1-9.WANG Jun-jie,HU Yu-xian.Studying on the seismic rotati0ncomponent[J].Earthquake engineering and engineeringvibration,1991,11(2):1-9.