新疆乌恰6.8级地震的场地响应分析
|
摘要
利用2008年10月5日新疆乌恰6.8级地震时新疆强震动观测台记录的S波资料和脉动观测资料,采用Nakamura方法计算了这些强震观测台的场地响应。结果表明:(1)地震记录前10s的脉动场地响应明显大于测试脉动和地震记录S波的场地响应,是测试脉动和记录S波场地响应的3倍,而测试脉动场地响应和S波记录场地响应基本相符。(2)当记录台站的等效剪切波速小于250m/s时,测试脉动场地响应值在2.5~5.0之间;当等效剪切波速大于250m/s时,测试脉动场地响应值在1.5~3.0之间。(3)当记录台站覆盖层为同一种类型时,台站测试脉动场地响应小于1。
Selecting the records of the seismic microtremor before the MS6.8 Wuqia earthquake on october 5,2008 and the S-wave data of the earthquake recorded by Xinjiang Strong Motion Network,we calculate the response of the strong-motion at these 26 stations through the Nakamura's technique.The results are as the following:(1)Ten seconds before the P-wave,the site amplification effects of the Earth pulse are 3 times of the effects of S-wave and the effects of the testing pulsation.Meanwhile,the site amplification effects of S-wave are constsitent with the ones of the testing pulsa.(2)When the equivalent shear-wave velocity of the recording stations is lower than 250 m/s,the site-response value of the test pulsation will be between 2.5 and 5.0.When the equivalent shear-wave velocity of the recording stations is higher than 250 m/s,the site-response value of the testing pulsation will be between 1.5 and 3.0.(3)When the overlayers under the recording station are of the same type,the site response value of the test pulsation will be lower than 1.
Selecting the records of the seismic microtremor before the MS6.8 Wuqia earthquake on october 5,2008 and the S-wave data of the earthquake recorded by Xinjiang Strong Motion Network,we calculate the response of the strong-motion at these 26 stations through the Nakamura's technique.The results are as the following:(1)Ten seconds before the P-wave,the site amplification effects of the Earth pulse are 3 times of the effects of S-wave and the effects of the testing pulsation.Meanwhile,the site amplification effects of S-wave are constsitent with the ones of the testing pulsa.(2)When the equivalent shear-wave velocity of the recording stations is lower than 250 m/s,the site-response value of the test pulsation will be between 2.5 and 5.0.When the equivalent shear-wave velocity of the recording stations is higher than 250 m/s,the site-response value of the testing pulsation will be between 1.5 and 3.0.(3)When the overlayers under the recording station are of the same type,the site response value of the test pulsation will be lower than 1.
引文
陈彧,崔建文,刘学军.2006.昆明地震动强度(烈度)观测台场地动力特征研究[J].地震研究,29(3):251-255.
崔建文,李正光,赵云旭.2007.2007年宁洱6.4级地震强震动观测记录[J].地震研究,30(4):384-388.
冯先岳.1997.新疆古地震[M].乌鲁木齐:新疆科技卫生出版社.
郭明珠.2000.地脉动分析及场地其在场地动力特征测试中的应用[D].哈尔滨:中国地震局工程力学所.
胡聿贤.2006.地震工程学[M].北京:地震出版社.
朱荣欢,苏有锦.2007.用H/V谱比法计算云南区域数字地震台站的场地响应[J].地震研究,30(3):248-252.
GB50021-2001.岩土工程勘察规范[S].
Aptikaev F,Kopnichev J.1980.Correlation between Seismic Vibration Pa-rameters and Type of faulting//[C],proc,7WCEE,1(1):107-110.
Lachet C,Hatzfeld D,Bard P,et al.1996.Site effects and microzonationin the city thessaloniki(Greece)comparision of different approaches[J].BSSA,86(6):1692-1703.
Nakamura Y.1989.A method for dynamic characteristics estimation ofsubsurface using microtremor on the ground surface[J].QR ofRTRI,30(1):25-23.
崔建文,李正光,赵云旭.2007.2007年宁洱6.4级地震强震动观测记录[J].地震研究,30(4):384-388.
冯先岳.1997.新疆古地震[M].乌鲁木齐:新疆科技卫生出版社.
郭明珠.2000.地脉动分析及场地其在场地动力特征测试中的应用[D].哈尔滨:中国地震局工程力学所.
胡聿贤.2006.地震工程学[M].北京:地震出版社.
朱荣欢,苏有锦.2007.用H/V谱比法计算云南区域数字地震台站的场地响应[J].地震研究,30(3):248-252.
GB50021-2001.岩土工程勘察规范[S].
Aptikaev F,Kopnichev J.1980.Correlation between Seismic Vibration Pa-rameters and Type of faulting//[C],proc,7WCEE,1(1):107-110.
Lachet C,Hatzfeld D,Bard P,et al.1996.Site effects and microzonationin the city thessaloniki(Greece)comparision of different approaches[J].BSSA,86(6):1692-1703.
Nakamura Y.1989.A method for dynamic characteristics estimation ofsubsurface using microtremor on the ground surface[J].QR ofRTRI,30(1):25-23.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心