| 2008年汶川地震后的三次强余震地表峰值加速度衰减场研究 |
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| 引用本文： | 姚凯,孙崇绍,朱珊珊,刘旭宙.2008年汶川地震后的三次强余震地表峰值加速度衰减场研究[J].西北地震学报,2012,34(1):99-104. |
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| 作者姓名： | 姚凯 孙崇绍 朱珊珊 刘旭宙 |
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| 作者单位： | 1. 中国地震局兰州地震研究所,甘肃兰州,730000
2. 防灾科技学院,北京,065201 |
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| 基金项目： | 中国地震局预测研究所基本科研业务专项，中国地震局业务专项，* |
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| 摘 要： | 利用甘肃省强震动台站获取的2008年汶川地震后的三次强余震记录资料,分别研究了在甘肃南部地区的地表自由场加速度衰减场,认为地震引起的地表峰值加速度(PGA)随震中距的衰减基本都遵从幂指数规律,衰减的形式基本相同,但是三次强余震的衰减指数之间也存在着一定的差异.因此要得到陇南地区的中强地震动衰减的普遍规律,尚需做进一步的研究.
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| 关 键 词： | 汶川地震强余震 强震动 峰值加速度 衰减场 |
Study on PGA Attenuation of Three Strong Aftershocks of 2008 Wenchuan Earthquake |
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| YAO Kai,SUN Chong-shao,ZHU Shan-shan,LIUN Xu-zhou.Study on PGA Attenuation of Three Strong Aftershocks of 2008 Wenchuan Earthquake[J].Northwestern Seismological Journal,2012,34(1):99-104. |
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| Authors: | YAO Kai SUN Chong-shao ZHU Shan-shan LIUN Xu-zhou |
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| Institution: | YAO Kai1,SUN Chong-shao1,ZHU Shan-shan2,LIUN Xu-zhou1(1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China;2.Institute of Disaster Prevention,Beijing 065201,China) |
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| Abstract: | Using the data of three strong aftershocks after the 2008 Wenchuan earthquake recorded by Gansu strong motion stations,the free field acceleration attenuation in southern Gansu province are studied.The attenuation of Peak Ground Acceleration(PGA) with the epicentral distance follows the exponential law,and the forms of attenuation are parallel.However,the attenuation index of three strong aftershocks also has some differences.The condition of the strong motion stations has certain influence to ground motion intensity and frequency spectrum.So further research to get the universal attenuation law of strong earthquakes in southern Gansu province is needed. |
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| Keywords: | Strong aftershocks of Wenchuan great earthquake Strong motion Peak acceleration Attenuation field |
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