新疆皮山M_S6.5地震远场长周期地面运动分析
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摘要
皮山M_S6.5地震获取的39组强震记录中,有6组都不同程度的记录到后续面波现象,处于塔里木盆地边缘的罕南力克台和亚曼亚台尤为清晰,这种面波产生原因是台站位于盆地边缘,并且台基下土层结构较为复杂。以罕南力克台和亚曼亚台为例,伽师台做为对比,进行时域、频域、能量函数、场地条件等分析。这种面波以瑞利波成分为主,周期为1.3 s。两个台站记录到的面波和剪切波携带的能量近似,为总地震波能量的22%左右。虽然所选的3个强震台站都处于塔里木盆地边缘地带,但由于伽师台下土层结构简单,并没有表现出后续面波现象。
In the 39 group of strong motion records of Xinjiang Pishan M_S6. 5 earthquake,6 groups of them showed subsequent surface wave in different degrees. Hannanlike station and Yamanya station recorded subsequent surface wave particularly clear due to their location of Tarim basin edge and complicated soil structure under station base. Taking Hannanlike station and Yamanya station as examples,analyzed their time-domain,frequency-domain,energy,sites comparing with those conditions of Jashi station. It was found that surface wave,mainly rayleigh wave,period was 1. 3 s. And through energy function values,we obtained that surface wave and shear wave boosted approximate energy values,which was about 22% of total seismic wave energy. Jashi station didn't show subsequent surface wave phenomenon because of its simple soil structure,although these 3 selected stations were all located at edge of Tarim Basin.
In the 39 group of strong motion records of Xinjiang Pishan M_S6. 5 earthquake,6 groups of them showed subsequent surface wave in different degrees. Hannanlike station and Yamanya station recorded subsequent surface wave particularly clear due to their location of Tarim basin edge and complicated soil structure under station base. Taking Hannanlike station and Yamanya station as examples,analyzed their time-domain,frequency-domain,energy,sites comparing with those conditions of Jashi station. It was found that surface wave,mainly rayleigh wave,period was 1. 3 s. And through energy function values,we obtained that surface wave and shear wave boosted approximate energy values,which was about 22% of total seismic wave energy. Jashi station didn't show subsequent surface wave phenomenon because of its simple soil structure,although these 3 selected stations were all located at edge of Tarim Basin.
引文
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[2]Fukuwa N.Key parameters governing the dynamic response of long-period structures[J].Journal of Seismology,2008,12(2):156-168.
[3]Koketsum K,Miyaka H.A seismological overview of long-period ground motion[J].Journal of seismology,2008,12(2):133-143.
[4]Trifunac M,Brune J.Complexity of energy release during the Imperial Valley,California,earthquake of 1940[J].Bulletin of the Seismological Society America,1970,60(1):137-160.
[5]叶迎晨,俞言祥,高孟潭.台湾西部滨海平原地震面波的长周期反应谱及其与规范谱的比较研究[J].地震工程与工程振动,2014,34(增刊):225-231.
[6]张宇翔,袁志祥.汶川8.0级地震陕西灾区震害特征分析[J].地震研究,2010,33(3):329-335.
[7]杨永强,李明,谢礼立.汶川地震加速度动力放大系数谱特征的统计分析[C]//2009全国土木工程博士生学术论坛编委会.2009全国土木工程博士生学术论坛优秀论文集.湖南:中南大学出版社,2009:482-487.
[8]袁一凡,田启文.工程地震学[M].北京:地震出版社,2012,88-89.
[9]郑秀芬,许绍燮,傅瑀.面波的质点运动轨迹在小爆破识别与判据研究中的应用[J].地震地磁观测与研究,2006,27(6):8-12.
[10]刘中宪,黄磊.含软夹层层状沉积谷地对P、SV和Rayleigh波的散射[J].地震工程与工程振动,2015,35(1):105-117.
[11]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.
[12]Kawase H,Aki K.A study on the response of a soft basin for incident S,P,and Rayleigh waves with special reference to the long duration observed in Mexico City[J].Bulletin of the Seismological Society America,1989,79(5):1 361-1 382.
[13]Robert W G.Modeling three-dimensional site response effects in the marina district basin,San Francisco,California[J].Bulletin of the Seismological Society America,1993,83(4):1 042-1 063.