【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。更多还原

【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.更多还原